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42677341
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10.1007/JHEP09(2016)041
|
Using the helicity-spinor language we explore the non-perturbative
constraints that Lorentz symmetry imposes on three-point amplitudes where the
asymptotic states can be massive. As it is well known, in the case of only
massless states the three-point amplitude is fixed up to a coupling constant by
these constraints plus some physical requirements. We find that a similar
statement can be made when some of the particles have mass. We derive the
generic functional form of the three-point amplitude by virtue of Lorentz
symmetry, which displays several functional structures accompanied by arbitrary
constants. These constants can be related to the coupling constants of the
theory, but in an unambiguous fashion only in the case of one massive particle.
Constraints on these constants are obtained by imposing that in the UV limit
the massive amplitude matches the massless one. In particular, there is a
certain Lorentz frame, which corresponds to projecting all the massive momenta
along the same null momentum, where the three-point massive amplitude is fully
fixed, and has a universal form.Comment: 31+10 pages, 0 figures. Relevant improvements of the results.
Appendix B added. Version accepted by journa
|
Lorentz Constraints on Massive Three-Point Amplitudes
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lorentz constraints on massive three-point amplitudes
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helicity spinor explore perturbative lorentz imposes amplitudes asymptotic massive. massless requirements. statement mass. derive generic virtue lorentz displays accompanied constants. unambiguous fashion massive particle. imposing massive matches massless one. lorentz projecting massive momenta massive universal pages figures. improvements results. added. journa
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non_dup
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[] |
42743061
|
10.1007/JHEP09(2016)042
|
A reliable comparison of different dark matter (DM) searches requires models
that satisfy certain consistency requirements like gauge invariance and
perturbative unitarity. As a well-motivated example, we study two-mediator DM
(2MDM). The model is based on a spontaneously broken $U(1)'$ gauge symmetry and
contains a Majorana DM particle as well as two $s$-channel mediators, one
vector (the $Z'$) and one scalar (the dark Higgs). We perform a global scan
over the parameters of the model assuming that the DM relic density is obtained
by thermal freeze-out in the early Universe and imposing a large set of
constraints: direct and indirect DM searches, monojet, dijet and dilepton
searches at colliders, Higgs observables, electroweak precision tests and
perturbative unitarity. We conclude that thermal DM is only allowed either
close to an $s$-channel resonance or if at least one mediator is lighter than
the DM particle. In these cases a thermal DM abundance can be obtained although
DM couplings to the Standard Model are tiny. Interestingly, we find that
vector-mediated DM-nucleon scattering leads to relevant constraints despite the
velocity-suppressed cross section, and that indirect detection can be important
if DM annihilations into both mediators are kinematically allowed.Comment: 30 pages, 9 figures + appendice
|
How to save the WIMP: global analysis of a dark matter model with two
s-channel mediators
|
how to save the wimp: global analysis of a dark matter model with two s-channel mediators
|
reliable searches satisfy consistency invariance perturbative unitarity. motivated mediator spontaneously broken majorana mediators scan relic freeze universe imposing indirect searches monojet dijet dilepton searches colliders observables electroweak precision perturbative unitarity. mediator lighter particle. abundance couplings tiny. interestingly nucleon suppressed indirect annihilations mediators kinematically pages appendice
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[] |
42707334
|
10.1007/JHEP09(2016)043
|
We discuss aspects of theories with superpotentials given by Arnold's $A,D,E$
singularities, particularly the novelties that arise when the fields are
matrices. We focus on 4d ${\cal N}=1$ variants of susy QCD, with $U(N_c)$ or
$SU(N_c)$ gauge group, $N_f$ fundamental flavors, and adjoint matter fields $X$
and $Y$ appearing in $W_{A,D,E}(X,Y)$ superpotentials. Many of our
considerations also apply in other possible contexts for matrix-variable
$W_{A,D,E}$. The 4d $W_{A,D,E}$ SQCD-type theories RG flow to superconformal
field theories, and there are proposed duals in the literature for the
$W_{A_k}$, $W_{D_k}$, and $W_{E_7}$ cases. As we review, the
$W_{D_\text{even}}$ and $W_{E_7}$ duals rely on a conjectural, quantum
truncation of the chiral ring. We explore these issues by considering various
deformations of the $W_{A,D,E}$ superpotentials, and the resulting RG flows and
IR theories. Rather than finding supporting evidence for the quantum truncation
and $W_{D_\text{even}}$ and $W_{E_7}$ duals, we note some challenging evidence
to the contrary.Comment: 59 pages, many figure
|
Deformations of $W_{A,D,E}$ SCFTs
|
deformations of $w_{a,d,e}$ scfts
|
superpotentials arnold singularities novelties arise matrices. variants susy flavors adjoint appearing superpotentials. considerations contexts sqcd superconformal duals cases. duals rely conjectural truncation chiral ring. explore deformations superpotentials flows theories. supporting truncation duals challenging pages
|
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42697163
|
10.1007/JHEP09(2016)044
|
We show that renormalization group(RG) flow can be viewed as a gradual wave
function collapse, where a quantum state associated with the action of field
theory evolves toward a final state that describes an IR fixed point. The
process of collapse is described by the radial evolution in the dual
holographic theory. If the theory is in the same phase as the assumed IR fixed
point, the initial state is smoothly projected to the final state. If in a
different phase, the initial state undergoes a phase transition which in turn
gives rise to a horizon in the bulk geometry. We demonstrate the connection
between critical behavior and horizon in an example, by deriving the bulk
metrics that emerge in various phases of the U(N) vector model in the large N
limit based on the holographic dual constructed from quantum RG. The gapped
phase exhibits a geometry that smoothly ends at a finite proper distance in the
radial direction. The geometric distance in the radial direction measures a
complexity : the depth of RG transformation that is needed to project the
generally entangled UV state to a direct product state in the IR. For gapless
states, entanglement persistently spreads out to larger length scales, and the
initial state can not be projected to the direct product state. The obstruction
to smooth projection at charge neutral point manifests itself as the long
throat in the anti-de Sitter space. The Poincare horizon at infinity marks the
critical point which exhibits a divergent length scale in the spread of
entanglement. For the gapless states with non-zero chemical potential, the bulk
space becomes the Lifshitz geometry with the dynamical critical exponent two.
The identification of horizon as critical point may provide an explanation for
the universality of horizon. We also discuss the structure of the bulk tensor
network that emerges from the quantum RG.Comment: 37 pages, 8 figures; v2) introduction expande
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Horizon as Critical Phenomenon
|
horizon as critical phenomenon
|
renormalization viewed gradual collapse evolves toward describes point. collapse holographic theory. smoothly projected state. undergoes horizon geometry. connection horizon deriving metrics emerge holographic gapped exhibits smoothly ends proper direction. geometric entangled gapless entanglement persistently spreads projected state. obstruction projection neutral manifests throat sitter space. poincare horizon infinity marks exhibits divergent spread entanglement. gapless lifshitz exponent two. horizon explanation universality horizon. emerges pages expande
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42744692
|
10.1007/JHEP09(2016)045
|
We compute the two-loop O(as*at) corrections to the Higgs boson masses in
supersymmetric extensions of the Standard Model with Dirac gaugino masses. We
rely on the effective-potential technique, allow for both Dirac and Majorana
mass terms for the gluinos, and compute the corrections in both the DRbar and
on-shell renormalisation schemes. We give detailed results for the MDGSSM and
the MRSSM, and simple approximate formulae valid in the decoupling limit for
all currently-studied variants of supersymmetric models with Dirac gluinos.
These results represent the first explicit two-loop calculation of Higgs boson
masses in supersymmetric models beyond the MSSM and the NMSSM.Comment: 36 pages, 5 figures; v2: version published in JHE
|
Leading two-loop corrections to the Higgs boson masses in SUSY models
with Dirac gauginos
|
leading two-loop corrections to the higgs boson masses in susy models with dirac gauginos
|
boson supersymmetric extensions dirac gaugino masses. rely dirac majorana gluinos drbar renormalisation schemes. mdgssm mrssm approximate formulae valid decoupling variants supersymmetric dirac gluinos. boson supersymmetric mssm pages
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42697664
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10.1007/JHEP09(2016)046
|
Anomalous chiral conductivities in theories with global anomalies are
independent of whether they are computed in a weakly coupled quantum (or
thermal) field theory, hydrodynamics, or at infinite coupling from holography.
While the presence of dynamical gauge fields and mixed, gauge-global anomalies
can destroy this universality, in their absence, the non-renormalisation of
anomalous Ward identities is expected to be obeyed at all intermediate coupling
strengths. In holography, bulk theories with higher-derivative corrections
incorporate coupling constant corrections to the boundary theory observables in
an expansion around infinite coupling. In this work, we investigate the
coupling constant dependence and universality of anomalous conductivities (and
thus of the anomalous Ward identities) in general, four-dimensional systems
that possess asymptotically anti-de Sitter holographic duals with a
non-extremal black brane in five dimensions, and anomalous transport introduced
into the boundary theory via the bulk Chern-Simons action. We show that in bulk
theories with arbitrary gauge- and diffeomorphism-invariant higher-derivative
actions, anomalous conductivities, which can incorporate an infinite series of
(inverse) coupling constant corrections, remain universal. Owing to the
existence of the membrane paradigm, the proof reduces to a construction of bulk
effective theories at the horizon and the boundary. It only requires us to
impose the condition of horizon regularity and correct boundary conditions on
the fields. We also discuss ways to violate the universality by violating
conditions for the validity of the membrane paradigm, in particular, by adding
mass to the vector fields (a case with a mixed, gauge-global anomaly) and in
bulk geometries with a naked singularity.Comment: V2: 29 pages, 1 figure, version published in JHE
|
Universality of anomalous conductivities in theories with
higher-derivative holographic duals
|
universality of anomalous conductivities in theories with higher-derivative holographic duals
|
anomalous chiral conductivities anomalies weakly hydrodynamics infinite holography. anomalies destroy universality renormalisation anomalous ward identities obeyed strengths. holography incorporate observables infinite coupling. universality anomalous conductivities anomalous ward identities possess asymptotically sitter holographic duals extremal brane anomalous chern simons action. diffeomorphism anomalous conductivities incorporate infinite universal. owing paradigm reduces horizon boundary. impose horizon regularity fields. ways violate universality violating validity paradigm adding anomaly geometries naked pages
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42717891
|
10.1007/JHEP09(2016)047
|
We consider BPS Wilson loops in planar ABJM theory, wound multiple times
around the great circle. We compute the expectation value of the 1/6-BPS and
1/2-BPS Wilson loops to three- and two-loop order in perturbation theory,
respectively, dealing with the combinatorics of multiple winding via recursive
relations. For the 1/6-BPS Wilson loop we perform the computation at generic
framing and at framing 1 we find agreement with the localization result. For
the 1/2-BPS Wilson loop we compute the expectation value at trivial framing and
by comparison with the matrix model expression we extract the framing
dependence of the fermion diagrams.Comment: 40 page
|
A note on multiply wound BPS Wilson loops in ABJM
|
a note on multiply wound bps wilson loops in abjm
|
wilson loops planar abjm wound great circle. expectation wilson loops perturbation dealing combinatorics winding recursive relations. wilson generic framing framing localization result. wilson expectation trivial framing extract framing fermion
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42746503
|
10.1007/JHEP09(2016)049
|
We present a scenario where a $Z_2$-symmetric scalar field $\phi$ first
drives cosmic inflation, then reheats the Universe but remains
out-of-equilibrium itself, and finally comprises the observed dark matter
abundance, produced by particle decays \`{a} la freeze-in mechanism. We work
model-independently without specifying the interactions of the scalar field
besides its self-interaction coupling, $\lambda\phi^4$, non-minimal coupling to
gravity, $\xi\phi^2R$, and coupling to another scalar field, $g\phi^2\sigma^2$.
We find the scalar field $\phi$ serves both as the inflaton and a dark matter
candidate if $10^{-9}\lesssim \lambda\lesssim g\lesssim 10^{-7}$ and $3
\rm{keV} \lesssim m_{\rm \phi}\lesssim 85 \rm{MeV}$ for $\xi=\mathcal{O}(1)$.
Such a small value of the non-minimal coupling is also found to be of the right
magnitude to produce the observed curvature perturbation amplitude within the
scenario. We also discuss how the model may be distinguished from other
inflationary models of the same type by the next generation CMB satellites.Comment: 14 pages, 2 figures. Typos corrected, references added. To appear in
JHE
|
Feebly Interacting Dark Matter Particle as the Inflaton
|
feebly interacting dark matter particle as the inflaton
|
drives cosmic inflation reheats universe comprises abundance decays freeze mechanism. independently specifying besides lambda sigma serves inflaton candidate lesssim lambda lesssim lesssim lesssim lesssim mathcal curvature perturbation scenario. distinguished inflationary pages figures. typos corrected added.
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73347326
|
10.1007/JHEP09(2016)050
|
We show that the relatively small but coincident excesses observed around 2
TeV in the ATLAS Run 1 and Run 2 hadronic diboson searches --- when a cut on
the number of tracks in the fat jets is not applied --- and the null results of
all remaining high-mass diboson searches are compatible with the decay of a
triboson resonance $R$ into $WZ$ plus an extra particle $X$. These decays can
take place via new neutral ($Y^0$) or charged ($Y^\pm$) particles, namely $R
\to Y^0 \, W$, with $Y^0 \to Z X$, or $R \to Y^\pm Z$, with $Y^\pm \to W X$. An
obvious candidate for such intermediate particle is a neutral one $Y^0$, given
a $3.9\sigma$ excess found at 650 GeV by the CMS Collaboration in searches for
intermediate mass diboson resonances decaying to $ZV$, with $V=W,Z$. We discuss
discovery strategies for triboson resonances with small modifications of
existing hadronic searches.Comment: LaTeX 32 pages, 38 figures. v2: Figs. 6, 9 and 11 modified. v3: added
VH search in hadronic final state. v4: final published versio
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Traces of a triboson resonance
|
traces of a triboson resonance
|
coincident excesses atlas hadronic diboson searches tracks jets diboson searches compatible triboson extra decays neutral obvious candidate neutral sigma excess searches diboson resonances decaying discovery triboson resonances modifications hadronic latex pages figures. figs. modified. hadronic state. versio
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73352427
|
10.1007/JHEP09(2016)054
|
We reconsider gravitational corrections to vacuum decay, confirming and
simplifying earlier results and extending them by allowing for a non-minimal
coupling of the Higgs to gravity. We find that leading-order gravitational
corrections suppress the vacuum decay rate. Furthermore, we compute minor
corrections to thermal vacuum decay in the SM by adding one-loop contributions
to the Higgs kinetic term, two-loop contributions to the Higgs potential and
allowing for time-dependent bounces.Comment: 19 pages, 7 figure
|
On gravitational and thermal corrections to vacuum decay
|
on gravitational and thermal corrections to vacuum decay
|
reconsider gravitational confirming simplifying extending allowing gravity. gravitational suppress rate. minor adding allowing pages
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42742514
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10.1007/JHEP09(2016)057
|
We present a simulation program for the production of a pair of W bosons in
association with a jet, that can be used in conjunction with general-purpose
shower Monte Carlo generators, according to the POWHEG method. We have further
adapted and implemented the MINLO' method on top of the NLO calculation
underlying our WW+jet generator. Thus, the resulting simulation achieves NLO
accuracy not only for inclusive distributions in WW+jet production but also WW
production, i.e. when the associated jet is not resolved, without the
introduction of any unphysical merging scale. This work represents the first
extension of the MINLO' method, in its original form, to the case of a genuine
underlying 2->2 process, with non-trivial virtual corrections.Comment: 22 pages, 9 figure
|
Merging WW and WW+jet with MINLO
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merging ww and ww+jet with minlo
|
bosons conjunction shower monte carlo generators powheg method. adapted implemented minlo generator. achieves inclusive i.e. resolved unphysical merging scale. minlo genuine trivial virtual pages
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42721157
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10.1007/JHEP09(2016)058
|
We study entanglement in states of holographic CFTs defined by Euclidean path
integrals over geometries with slowly varying metrics. In particular, our CFT
spacetimes have $S^1$ fibers whose size $b$ varies along one direction ($x$) of
an ${\mathbb R}^{d-1}$ base. Such examples respect an ${\mathbb R}^{d-2}$
Euclidean symmetry. Treating the $S^1$ direction as time leads to a thermofield
double state on a spacetime with adiabatically varying redshift, while treating
another direction as time leads to a confining ground state with slowly varying
confinement scale. In both contexts the entropy of slab-shaped regions defined
by $|x - x_0| \le L$ exhibits well-known phase transitions at length scales $L=
L_{crit}$ characterizing the CFT entanglements. For the thermofield double, the
numerical coefficients governing the effect of variations in $b(x)$ on the
transition are surprisingly small and exhibit an interesting change of sign:
gradients reduce $L_{crit}$ for $d \le 3$ but increase $L_{crit}$ for $d\ge4$.
This means that, while for general $L > L_{crit}$ they significantly increase
the mutual information of opposing slabs as one would expect, for $d\ge 4$
gradients cause a small decrease near the phase transition. In contrast, for
the confining ground states gradients always decrease $L_{crit}$, with the
effect becoming more pronounced in higher dimensions.Comment: 32 pages, 16 figures, typos fixed and reg. procedure refine
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Adiabatic corrections to holographic entanglement in thermofield doubles
and confining ground states
|
adiabatic corrections to holographic entanglement in thermofield doubles and confining ground states
|
entanglement holographic cfts euclidean integrals geometries slowly metrics. spacetimes fibers varies mathbb base. mathbb euclidean symmetry. treating thermofield spacetime adiabatically treating confining slowly confinement scale. contexts slab shaped exhibits crit characterizing entanglements. thermofield governing surprisingly exhibit gradients crit crit crit mutual opposing slabs gradients transition. confining gradients crit becoming pronounced pages typos reg. refine
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42737769
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10.1007/JHEP09(2016)059
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Using the AdS/CFT duality, we study the expectation value of stress tensor in
$2+1$-dimensional quantum critical theories with a general dynamical scaling
$z$, and explore various constrains on negative energy density for strongly
coupled field theories. The holographic dual theory is the theory of gravity in
3+1-dimensional Lifshitz backgrounds. We adopt a consistent approach to obtain
the boundary stress tensor from bulk construction, which satisfies the trace
Ward identity associated with Lifshitz scaling symmetry. In particular, the
boundary stress tensor, constructed from the gravitational wave deformed
Lifshitz geometry, is found up to second order in gravitational wave
perturbations. {The result} is compared to its counterpart in free {scalar}
field theory at the same order in an expansion of small squeezing parameters.
This allows us to relate the boundary values of gravitational waves to the
squeezing parameters of squeezed vacuum states. We find that, in both cases
with $z=1$, the stress tensor satisfies the averaged null energy condition, and
is consistent with the quantum interest conjecture. Moreover, the negative
lower bound on null-contracted stress tensor, which is averaged over time-like
trajectories along nearly null directions, is obtained. We find a weaker
constraint on the magnitude and duration of negative null energy density in
strongly coupled field theory as compared with the constraint in free
relativistic field theory. The implications are discussed.Comment: This is the version(v2) published in JHE
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A Holographic Description of Negative Energy States
|
a holographic description of negative energy states
|
duality expectation explore constrains theories. holographic lifshitz backgrounds. adopt satisfies trace ward lifshitz symmetry. gravitational deformed lifshitz gravitational perturbations. counterpart squeezing parameters. relate gravitational squeezing squeezed states. satisfies averaged conjecture. contracted averaged trajectories nearly directions obtained. weaker relativistic theory.
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non_dup
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42741981
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10.1007/JHEP09(2016)060
|
The holographic entanglement entropy is studied numerically in
(4+1)-dimensional spherically symmetric Gauss-Bonnet AdS black hole spacetime
with compact boundary. On the bulk side the black hole spacetime undergoes a
van der Waals-like phase transition in the extended phase space, which is
reviewed with emphasis on the behavior on the temperature-entropy plane. On the
boundary, we calculated the regularized HEE of a disk region of different
sizes. We find strong numerical evidence for the failure of equal area law for
isobaric curves on the temperature-HEE plane and for the correctness of first
law of entanglement entropy, and briefly give an explanation for why the latter
may serve as a reason for the former, i.e. the failure of equal area law on the
temperature-HEE plane.Comment: 17 pages, 4 PDF figures. Update: journal versio
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Thermodynamics and holographic entanglement entropy for spherical black
holes in 5D Gauss-Bonnet gravity
|
thermodynamics and holographic entanglement entropy for spherical black holes in 5d gauss-bonnet gravity
|
holographic entanglement numerically spherically gauss bonnet spacetime boundary. spacetime undergoes waals reviewed emphasis plane. regularized sizes. isobaric correctness entanglement briefly explanation serve former i.e. pages figures. update versio
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42749342
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10.1007/JHEP09(2016)061
|
The so called one-parameter (often called $\varkappa$) deformed $AdS$ string
sigma models have attracted a lot of attention lately in the study of
integrability in string theory. We construct various circular string solutions
in the $(AdS_3 \times S^3)_{\varkappa}$ background and describe the
characteristics of such solutions qualitatively. We study the Bohr-Sommerfeld
like quantization for these string states to characterise the motion. Further
we find a `long' string limit of such circular strings in the
$\varkappa$-deformed $AdS_3$ and find a novel dependence of the oscillation
number on the energy in the next to leading order expansion.Comment: v2: References added, typos correcte
|
On circular strings in $(AdS_3 \times S^3)_{\varkappa}$
|
on circular strings in $(ads_3 \times s^3)_{\varkappa}$
|
varkappa deformed sigma attracted lately integrability theory. circular varkappa qualitatively. bohr sommerfeld quantization characterise motion. circular strings varkappa deformed oscillation typos correcte
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42744724
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10.1007/JHEP09(2016)063
|
We study the non-linearly realized spontaneously broken supersymmetry of the
(anti-)D3-brane action in type IIB string theory. The worldvolume fields are
one vector $A_\mu$, three complex scalars $\phi^i$ and four 4d fermions
$\lambda^0$, $\lambda^i$. These transform, in addition to the more familiar N=4
linear supersymmetry, also under 16 spontaneously broken, non-linearly realized
supersymmetries. We argue that the worldvolume fields can be packaged into the
following constrained 4d non-linear N=1 multiplets: four chiral multiplets $S$,
$Y^i$ that satisfy $S^2=SY^i=0$ and contain the worldvolume fermions
$\lambda^0$ and $\lambda^i$; and four chiral multiplets $W_\alpha$, $H^i$ that
satisfy $S W_\alpha=0$ and $S \bar D_{\dot \alpha} \bar H^{\bar \imath}=0$ and
contain the vector $A_\mu$ and the scalars $\phi^i$. We also discuss how
placing an anti-D3-brane on top of intersecting O7-planes can lead to an
orthogonal multiplet $\Phi$ that satisfies $S(\Phi-\bar \Phi)=0$, which is
particularly interesting for inflationary cosmology.Comment: 28 pages, v2: published version, 1 reference adde
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String Theory Origin of Constrained Multiplets
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string theory origin of constrained multiplets
|
linearly realized spontaneously broken supersymmetry brane theory. worldvolume scalars fermions lambda lambda transform familiar supersymmetry spontaneously broken linearly realized supersymmetries. argue worldvolume packaged constrained multiplets chiral multiplets satisfy worldvolume fermions lambda lambda chiral multiplets alpha satisfy alpha alpha imath scalars placing brane intersecting planes orthogonal multiplet satisfies inflationary pages adde
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42728456
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10.1007/JHEP09(2016)064
|
Making use of integral forms and superfield techniques we propose
supersymmetric extensions of the multimetric gravity Lagrangians in dimensions
one, two, three and four. The supersymmetric interaction potential covariantly
deforms the bosonic one, producing in particular suitable super-symmetric
polynomials generated by the Berezinian. As an additional application of our
formalism we construct supersymmetric multi-Maxwell theories in dimensions
three and four.Comment: 37 pages, Latex2e, no figure
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Multimetric Supergravities
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multimetric supergravities
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superfield propose supersymmetric extensions multimetric lagrangians four. supersymmetric covariantly deforms bosonic producing super polynomials berezinian. formalism supersymmetric maxwell pages latex
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42736070
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10.1007/JHEP09(2016)065
|
We study a simple class of correlators with two heavy and two light operators
both in the D1D5 CFT and in the dual AdS$_3 \times S^3 \times T^4$ description.
On the CFT side we focus on the free orbifold point and discuss how these
correlators decompose in terms of conformal blocks, showing that they are
determined by protected quantities. On the gravity side, the heavy states are
described by regular, asymptotically AdS$_3 \times S^3 \times T^4$ solutions
and the correlators are obtained by studying the wave equation in these
backgrounds. We find that the CFT and the gravity results agree and that, even
in the large central charge limit, these correlators do not have (Euclidean)
spurious singularities. We suggest that this is indeed a general feature of the
heavy-light correlators in unitary CFTs, which can be relevant for
understanding how information is encoded in black hole microstates.Comment: 32 pages, v2: citations added, typos corrected, v3: typos corrected,
submitted to JHE
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Correlators at large c without information loss
|
correlators at large c without information loss
|
correlators description. orbifold correlators decompose conformal blocks protected quantities. asymptotically correlators studying backgrounds. agree correlators euclidean spurious singularities. correlators unitary cfts encoded pages citations typos corrected typos corrected submitted
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42683078
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10.1007/JHEP09(2016)066
|
We analyze the dynamical response functions of strongly interacting quantum
critical states described by conformal field theories (CFTs). We construct a
self-consistent holographic model that incorporates the relevant scalar
operator driving the quantum critical phase transition. Focusing on the finite
temperature dynamical conductivity $\sigma(\omega,T)$, we study its dependence
on our model parameters, notably the scaling dimension of the relevant
operator. It is found that the conductivity is well-approximated by a simple
ansatz proposed by Katz et al [1] for a wide range of parameters. We further
dissect the conductivity at large frequencies $\omega >> T$ using the operator
product expansion, and show how it reveals the spectrum of our model CFT. Our
results provide a physically-constrained framework to study the analytic
continuation of quantum Monte Carlo data, as we illustrate using the O(2)
Wilson-Fisher CFT. Finally, we comment on the variation of the conductivity as
we tune away from the quantum critical point, setting the stage for a
comprehensive analysis of the phase diagram near the transition.Comment: 25+18 pages; 8+2 figures; 1 table. v3: published versio
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A Holographic Model for Quantum Critical Responses
|
a holographic model for quantum critical responses
|
analyze interacting conformal cfts holographic incorporates driving transition. focusing conductivity sigma omega notably operator. conductivity approximated ansatz katz parameters. dissect conductivity omega reveals cft. physically constrained analytic continuation monte carlo illustrate wilson fisher cft. comment conductivity tune away comprehensive pages table. versio
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42727263
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10.1007/JHEP09(2016)067
|
We numerically construct large Randall-Sundrum II brane black holes in 4 and
5 dimensions from associated AdS/CFT spacetimes. Our solutions are leading
order perturbations of a representative of the boundary conformal structure of
the AdS spacetime sourced by the dual CFT stress tensor. The 4-dimensional
solutions are static perturbations of the Euclidean Schwarzschild metric, while
the 5-dimensional solutions are perturbations of the Myers-Perry metric with
equal angular momenta. We compare the former with previous numerical results
for Randall-Sundrum bulk black holes and find good agreement down to a horizon
radius of about rH ~30l. The latter are the first numerical results pertaining
to rotating Randall-Sundrum black holes. They have the same entropy, but a
larger horizon area than Myers-Perry black holes of the same mass and angular
momentum.Comment: 25 pages, 14 figures, v2: references adde
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Perturbative Construction of Stationary Randall-Sundrum II Black Holes
on a 5-Brane
|
perturbative construction of stationary randall-sundrum ii black holes on a 5-brane
|
numerically randall sundrum brane holes spacetimes. perturbations conformal spacetime sourced tensor. perturbations euclidean schwarzschild perturbations myers perry momenta. former randall sundrum holes horizon pertaining rotating randall sundrum holes. horizon myers perry holes pages adde
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78072213
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10.1007/JHEP09(2016)068
|
In this work, we investigate modular Hamiltonians defined with respect to arbitrary spatial regions in quantum field theory states which have semi-classical gravity duals. We find prescriptions in the gravity dual for calculating the action of the modular Hamiltonian on its defining state, including its dual metric, and also on small excitations around the state. Curiously, use of the covariant holographic entanglement entropy formula leads us to the conclusion that the modular Hamiltonian, which in the quantum field theory acts only in the causal completion of the region, does not commute with bulk operators whose entire gauge-invariant description is space-like to the causal completion of the region.United States. Dept. of Energy (Contract DE-SC00012567
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The gravity duals of modular Hamiltonians
|
the gravity duals of modular hamiltonians
|
modular hamiltonians duals. prescriptions calculating modular defining excitations state. curiously covariant holographic entanglement modular acts causal completion commute causal completion region.united states. dept. contract
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non_dup
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42747827
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10.1007/JHEP09(2016)069
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In this work, we study the SM-like Higgs pair productions in the framework of
the general CP-violating two-Higgs-doublet model. Several constraints are
imposed to the model sequentially, including the SM-like Higgs boson signal
fits, the precise measurements of the electric dipole moments, the perturbative
unitarity and stability bounds to the Higgs potential, and the most recent LHC
searches for the heavy Higgs bosons. We show how are the CP-violating mixing
angles related to the Higgs cubic self couplings in this setup. Afterwards, we
estimate the cross sections of the future LHC/SppC searches for the Higgs pair
productions, as well as other possible decay modes for the heavy Higgs bosons.Comment: JHEP style, 29 pages, 9 figures, matches the published versio
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Higgs pair productions in the CP-violating two-Higgs-doublet model
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higgs pair productions in the cp-violating two-higgs-doublet model
|
productions violating doublet model. imposed sequentially boson fits precise dipole moments perturbative unitarity bounds searches bosons. violating angles cubic couplings setup. afterwards sppc searches productions jhep style pages matches versio
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non_dup
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29567302
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10.1007/JHEP09(2016)070
|
In the context of conformal field theories in general space-time dimension,
we find all the possible singularities of the conformal blocks as functions of
the scaling dimension $\Delta$ of the exchanged operator. In particular, we
argue, using representation theory of parabolic Verma modules, that in odd
spacetime dimension the singularities are only simple poles. We discuss how to
use this information to write recursion relations that determine the conformal
blocks. We first recover the recursion relation introduced in 1307.6856 for
conformal blocks of external scalar operators. We then generalize this
recursion relation for the conformal blocks associated to the four point
function of three scalar and one vector operator. Finally we specialize to the
case in which the vector operator is a conserved current.Comment: 55 pages, 12 figures; v2 Typos corrected, conclusions changed,
reference adde
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Recursion Relations for Conformal Blocks
|
recursion relations for conformal blocks
|
conformal singularities conformal blocks delta exchanged operator. argue parabolic verma modules spacetime singularities poles. recursion conformal blocks. recover recursion conformal blocks operators. generalize recursion conformal blocks operator. specialize conserved pages typos corrected changed adde
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non_dup
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42719570
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10.1007/JHEP09(2016)071
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We consider "new inflation" inflationary models at small fields, embedded in
minimal ${\cal N}=1$ supergravity with a single chiral superfield. Imposing a
period of inflation compatible with experiment severely restricts possible
models, classified in perturbation theory. If moreover we impose that the field
goes to large values and very small potential at the current time, like would
be needed for instance for the inflaton being the volume modulus in large extra
dimensional scenarios, the possible models are restricted to very contrived
superpotentials.Comment: 25 pages, no figures; references and explanation adde
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Small field inflation in ${\cal N}=1$ supergravity with a single chiral
superfield
|
small field inflation in ${\cal n}=1$ supergravity with a single chiral superfield
|
inflation inflationary embedded supergravity chiral superfield. imposing inflation compatible severely restricts classified perturbation theory. impose goes inflaton modulus extra scenarios restricted contrived pages explanation adde
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non_dup
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42664706
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10.1007/JHEP09(2016)073
|
We study the action of mirror symmetry on two-dimensional N=(2,2) effective
theories obtained by compactifying Type IIA string theory on Calabi-Yau
fourfolds. Our focus is on fourfold geometries with non-trivial three-form
cohomology. The couplings of the massless zero-modes arising by expanding in
these forms depend both on the complex structure deformations and the Kahler
structure deformations of the Calabi-Yau fourfold. We argue that two
holomorphic functions of the deformation moduli capture this information. These
are exchanged under mirror symmetry, which allows us to derive them at the
large complex structure and large volume point. We discuss the application of
the resulting explicit expression to F-theory compactifications and their weak
string coupling limit. In the latter orientifold settings we demonstrate
compatibility with mirror symmetry of Calabi-Yau threefolds at large complex
structure. As a byproduct we find an interesting relation of no-scale like
conditions on Kahler potentials to the existence of chiral and twisted-chiral
descriptions in two dimensions.Comment: 36 page
|
On Mirror Symmetry for Calabi-Yau Fourfolds with Three-Form Cohomology
|
on mirror symmetry for calabi-yau fourfolds with three-form cohomology
|
mirror compactifying calabi fourfolds. fourfold geometries trivial cohomology. couplings massless arising expanding deformations kahler deformations calabi fourfold. argue holomorphic deformation moduli capture information. exchanged mirror derive point. compactifications limit. orientifold settings compatibility mirror calabi threefolds structure. byproduct kahler potentials chiral twisted chiral descriptions
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non_dup
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42651313
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10.1007/JHEP09(2016)075
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We propose a new efficient algorithm to obtain the locally minimal generating
set of the syzygies for an ideal, i.e. a generating set whose proper subsets
cannot be generating sets. Syzygy is a concept widely used in the current study
of scattering amplitudes. This new algorithm can deal with more syzygies
effectively because a new generation of syzygies is obtained in each step and
the irreducibility of this generation is also verified in the process. This
efficient algorithm can also be applied in getting the syzygies for the
modules. We also show a typical example to illustrate the potential application
of this method in scattering amplitudes, especially the Integral-By-Part(IBP)
relations of the characteristic two-loop diagrams in the Yang-Mills theory.Comment: 33 pages, 10 figure
|
Syzygies Probing Scattering Amplitudes
|
syzygies probing scattering amplitudes
|
propose locally generating syzygies ideal i.e. generating proper subsets generating sets. syzygy widely amplitudes. deal syzygies effectively syzygies irreducibility verified process. getting syzygies modules. illustrate amplitudes diagrams mills pages
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non_dup
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42749163
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10.1007/JHEP09(2016)076
|
We propose and study a novel extension of the Standard Model based on the B-L
gauge symmetry that can account for dark matter and neutrino masses. In this
model, right-handed neutrinos are absent and the gauge anomalies are canceled
instead by four chiral fermions with fractional B-L charges. After the breaking
of $U(1)_{B-L}$, these fermions arrange themselves into two Dirac particles,
the lightest of which is automatically stable and plays the role of the dark
matter. We determine the regions of the parameter space consistent with the
observed dark matter density and show that they can be partially probed via
direct and indirect dark matter detection or collider searches at the LHC.
Neutrino masses, on the other hand, can be explained by a variant of the
type-II seesaw mechanism involving one of the two scalar fields responsible for
the dark matter mass.Comment: 23 pages, 10 figure
|
A new B-L model without right-handed neutrinos
|
a new b-l model without right-handed neutrinos
|
propose masses. handed neutrinos absent anomalies canceled chiral fermions fractional charges. breaking fermions arrange dirac lightest automatically plays matter. partially probed indirect collider searches lhc. variant seesaw involving pages
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non_dup
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42692673
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10.1007/JHEP09(2016)077
|
We present global fits of an effective field theory description of real, and
complex scalar dark matter candidates. We simultaneously take into account all
possible dimension 6 operators consisting of dark matter bilinears and gauge
invariant combinations of quark and gluon fields. We derive constraints on the
free model parameters for both the real (five parameters) and complex (seven)
scalar dark matter models obtained by combining Planck data on the cosmic
microwave background, direct detection limits from LUX, and indirect detection
limits from the Fermi Large Area Telescope. We find that for real scalars
indirect dark matter searches disfavour a dark matter particle mass below 100
GeV. For the complex scalar dark matter particle current data have a limited
impact due to the presence of operators that lead to p-wave annihilation, and
also do not contribute to the spin-independent scattering cross- section.
Although current data are not informative enough to strongly constrain the
theory parameter space, we demonstrate the power of our formalism to
reconstruct the theoretical parameters compatible with an actual dark matter
detection, by assuming that the excess of gamma rays observed by the Fermi
Large Area Telescope towards the Galactic centre is entirely due to dark matter
annihilations. Please note that the excess can very well be due to
astrophysical sources such as millisecond pulsars. We find that scalar dark
matter interacting via effective field theory operators can in principle
explain the Galactic centre excess, but that such interpretation is in strong
tension with the non-detection of gamma rays from dwarf galaxies in the real
scalar case. In the complex scalar case there is enough freedom to relieve the
tension.Comment: 20 pages, 5 figure
|
Effective Field Theory of Dark Matter: a Global Analysis
|
effective field theory of dark matter: a global analysis
|
fits candidates. simultaneously consisting bilinears combinations gluon fields. derive seven combining planck cosmic microwave indirect fermi telescope. scalars indirect searches disfavour gev. annihilation section. informative constrain formalism reconstruct compatible excess gamma rays fermi telescope galactic entirely annihilations. please excess astrophysical millisecond pulsars. interacting galactic excess tension gamma rays dwarf case. freedom relieve pages
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non_dup
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[] |
42729997
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10.1007/JHEP09(2016)078
|
The splitting processes of bremsstrahlung and pair production in a medium are
coherent over large distances in the very high energy limit, which leads to a
suppression known as the Landau-Pomeranchuk-Migdal (LPM) effect. In this paper,
we continue analysis of the case when the coherence lengths of two consecutive
splitting processes overlap (which is important for understanding corrections
to standard treatments of the LPM effect in QCD), avoiding soft-gluon
approximations. In particular, this paper analyzes the subtle problem of how to
precisely separate overlapping double splitting (e.g.\ overlapping double
bremsstrahlung) from the case of consecutive, independent bremsstrahlung (which
is the case that would be implemented in a Monte Carlo simulation based solely
on single splitting rates). As an example of the method, we consider the rate
of real double gluon bremsstrahlung from an initial gluon with various
simplifying assumptions (thick media; $\hat q$ approximation; large $N_c$; and
neglect for the moment of processes involving 4-gluon vertices) and explicitly
compute the correction $\Delta\,d\Gamma/dx\,dy$ due to overlapping formation
times.Comment: 59 pages, 37 figures. The major changes from v1: new section I.A.4
added to give kinetic theory analogy to better explain the importance of the
subtraction defining Delta[d(Gamma)/dx dy]; new appendix F added to
compare/contrast with issues raised by Blaizot, Dominguez, Iancu, and
Mehtar-Tani [22
|
The LPM effect in sequential bremsstrahlung 2: factorization
|
the lpm effect in sequential bremsstrahlung 2: factorization
|
splitting bremsstrahlung coherent distances suppression landau pomeranchuk migdal effect. continue coherence lengths consecutive splitting overlap treatments avoiding gluon approximations. analyzes subtle precisely overlapping splitting e.g. overlapping bremsstrahlung consecutive bremsstrahlung implemented monte carlo solely splitting gluon bremsstrahlung gluon simplifying assumptions thick neglect moment involving gluon explicitly delta gamma overlapping pages figures. i.a. analogy subtraction defining delta gamma raised blaizot dominguez iancu mehtar tani
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non_dup
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[] |
42736411
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10.1007/JHEP09(2016)079
|
The LHC is now studying in detail the couplings of the Higgs boson in order
to determine if there is new physics. Many recent studies have examined the
available fits to Higgs couplings from the perspective of constraining two
Higgs doublet models (2HDM). In this paper we extend those studies to include
constraints on the one loop couplings of the Higgs to gluons and photons. These
couplings are particularly sensitive to the existence of new colored particles
that are hard to detect otherwise and we use them to constrain a 2HDM augmented
with a color-octet scalar, a possibility motivated by minimal flavor violation.
We first study theoretical constraints on this model and then compare them with
LHC measurements.Comment: 23 pages, 10 figures; Matched the publication versio
|
Two Higgs doublet models augmented by a scalar color octet
|
two higgs doublet models augmented by a scalar color octet
|
studying couplings boson physics. fits couplings perspective constraining doublet extend couplings gluons photons. couplings colored detect constrain augmented octet motivated flavor violation. pages matched publication versio
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non_dup
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[] |
42700244
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10.1007/JHEP09(2016)080
|
Natural realisations of supersymmetry require light stops ${\tilde t}_1$,
making them a prime target of LHC searches for physics beyond the Standard
Model. Depending on the kinematic region, the main search channels are ${\tilde
t_1}\to t \tilde \chi^0_1$, ${\tilde t_1}\to W b \tilde \chi^0_1$ and ${\tilde
t_1}\to c \tilde \chi^0_1$. We first examine the interplay of these decay modes
with ${\tilde c_1}\to c \tilde \chi^0_1$ in a model-independent fashion,
revealing the existence of large regions in parameter space which are excluded
for any ${\tilde t_1}\to c \tilde \chi^0_1$ branching ratio. This effect is
then illustrated for scenarios with stop-scharm mixing in the right-handed
sector, where it has previously been observed that the stop mass limits can be
significantly weakened for large mixing. Our analysis shows that once the LHC
bounds from ${\tilde c_1}\to c \tilde \chi^0_1$ searches are taken into
account, non-zero stop-scharm mixing leads only to a modest increase in the
allowed regions of parameter space, with large areas excluded for arbitrary
mixing angles.Comment: 19 pages, 9 figure
|
Stop searches in flavourful supersymmetry
|
stop searches in flavourful supersymmetry
|
realisations supersymmetry stops tilde prime searches model. kinematic tilde tilde tilde tilde tilde tilde examine interplay tilde tilde fashion revealing excluded tilde tilde branching ratio. illustrated scenarios stop scharm handed stop weakened mixing. bounds tilde tilde searches stop scharm modest excluded pages
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non_dup
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[] |
42704536
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10.1007/JHEP09(2016)082
|
We have investigated the motion of timelike particles along geodesic in the
background of accelerating and rotating black hole spacetime. We confirmed that
the chaos exists in the geodesic motion of the particles by Poincar\'e
sections, the power spectrum, the fast Lyapunov exponent indicator and the
bifurcation diagram. Moreover, we probe the effects of the acceleration and
rotation parameters on the chaotic behavior of a timelike geodesic particle in
the black hole spacetime. Our results show that the acceleration brings richer
physics for the geodesic motion of particles.Comment: 20 pages, 12 figures, Accepted by JHEP for publicatio
|
Chaotic motion of particles in the accelerating and rotating black holes
spacetime
|
chaotic motion of particles in the accelerating and rotating black holes spacetime
|
timelike geodesic accelerating rotating spacetime. confirmed chaos geodesic poincar lyapunov exponent indicator bifurcation diagram. acceleration chaotic timelike geodesic spacetime. acceleration brings richer geodesic pages jhep publicatio
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non_dup
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[] |
42686021
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10.1007/JHEP09(2016)083
|
The observable epsilon_K is sensitive to flavor violation at some of the
highest scales. While its experimental uncertainty is at the half percent
level, the theoretical one is in the ballpark of 15%. We explore the nontrivial
dependence of the theory prediction and uncertainty on various conventions,
like the phase of the kaon fields. In particular, we show how such a rephasing
allows to make the short-distance contribution of the box diagram with two
charm quarks, eta_cc, purely real. Our results allow to slightly reduce the
total theoretical uncertainty of epsilon_K, while increasing the relative
impact of the imaginary part of the long distance contribution, underlining the
need to compute it reliably. We also give updated bounds on the new physics
operators that contribute to epsilon_K.Comment: 18 pages, 6 tables, 1 figure. v2: version accepted for publication on
JHEP. v3: typos corrected, all results unchange
|
A new look at the theory uncertainty of epsilon_K
|
a new look at the theory uncertainty of epsilon_k
|
observable epsilon flavor violation scales. percent ballpark explore nontrivial conventions kaon fields. rephasing charm quarks purely real. epsilon imaginary underlining reliably. updated bounds pages tables figure. publication jhep. typos corrected unchange
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non_dup
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42747057
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10.1007/JHEP09(2016)084
|
We explore the potential for the discovery of a dilaton
$\mathcal{O}(200-500)$ GeV in a classical scale/conformal invariant extension
of the Standard Model by investigating the size of the corresponding breaking
scale $\Lambda$ at the LHC, extending a previous analysis. In particular, we
address the recent bounds on $\Lambda$ derived from Higgs boson searches. We
investigate if such a dilaton can be produced via gluon-gluon fusion,
presenting rates for its decay either into a pair of Higgs bosons or into two
heavy gauge bosons, which can give rise to multi-leptonic final states. A
detailed analysis via PYTHIA-FastJet has been carried out of the dominant
Standard Model backgrounds, at a centre of mass energy of 14 TeV. We show that
early data of $\sim 20$ fb$^{-1}$ can certainly probe the region of parameter
space where such a dilaton is allowed. A conformal scale of 5 TeV is allowed by
the current data, for almost all values of the dilaton mass investigated.Comment: 26 pages, 37 figures and 7 tables, corrected final version to appear
on JHE
|
Bounds on the Conformal Scale of a Minimally Coupled Dilaton and
Multi-Leptonic Signatures at the LHC
|
bounds on the conformal scale of a minimally coupled dilaton and multi-leptonic signatures at the lhc
|
explore discovery dilaton mathcal conformal investigating breaking lambda extending analysis. bounds lambda boson searches. dilaton gluon gluon fusion presenting bosons bosons leptonic states. pythia fastjet backgrounds tev. certainly dilaton allowed. conformal dilaton pages tables corrected
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non_dup
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[] |
42667084
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10.1007/JHEP09(2016)085
|
The symmetries of string theory on ${\rm AdS}_3 \times {\rm S}^3 \times
\mathbb{T}^4$ at the dual of the symmetric product orbifold point are described
by a so-called Higher Spin Square (HSS). We show that the massive string
spectrum in this background organises itself in terms of representations of
this HSS, just as the matter in a conventional higher spin theory does so in
terms of representations of the higher spin algebra. In particular, the entire
untwisted sector of the orbifold can be viewed as the Fock space built out of
the multiparticle states of a single representation of the HSS, the so-called
`minimal' representation. The states in the twisted sector can be described in
terms of tensor products of a novel family of representations that are somewhat
larger than the minimal one.Comment: 34 pages; v2: typos fixe
|
String Theory as a Higher Spin Theory
|
string theory as a higher spin theory
|
symmetries mathbb orbifold massive organises representations representations algebra. untwisted orbifold viewed fock built multiparticle representation. twisted representations somewhat pages typos fixe
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non_dup
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[] |
73360566
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10.1007/JHEP09(2016)086
|
We point out that a hypothesis of squarks and sleptons being Nambu-Goldstone
(NG) bosons is consistent with pure gravity mediation or minimal split
supersymmetry (SUSY). As a concrete example, we consider a SUSY $E_7/SU(5)
\times U(1)^3$ non-linear sigma model in the framework of pure gravity
mediation. The model accommodates three families of the quark and lepton chiral
multiplets as (pseudo) NG multiplets of the Kahler manifold, which may enable
us to understand the origin and number of the families. We point out that
squarks in the first and second generations are likely to be as light as a few
TeV if the observed baryon asymmetry is explained by the thermal leptogenesis;
therefore, these colored particles can be discovered at the LHC Run-2 or at the
high luminosity LHC.Comment: 18 pages, 7 figure
|
Nambu-Goldstone Boson Hypothesis for Squarks and Sleptons in Pure
Gravity Mediation
|
nambu-goldstone boson hypothesis for squarks and sleptons in pure gravity mediation
|
squarks sleptons nambu goldstone bosons mediation split supersymmetry susy concrete susy sigma mediation. accommodates families lepton chiral multiplets pseudo multiplets kahler manifold enable families. squarks generations baryon asymmetry leptogenesis colored discovered luminosity pages
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non_dup
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[] |
42741006
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10.1007/JHEP09(2016)087
|
Complex Langevin simulations allow numerical studies of theories that exhibit
a sign problem, such as QCD, and are thereby potentially suitable to determine
the QCD phase diagram from first principles. Here we study QCD in the limit of
heavy quarks for a wide range of temperatures and chemical potentials. Our
results include an analysis of the adaptive gauge cooling technique, which
prevents large excursions into the non-compact directions of the SL($3,
\mathbb{C}$) manifold. We find that such excursions may appear spontaneously
and change the statistical distribution of physical observables, which leads to
disagreement with known results. Results whose excursions are sufficiently
small are used to map the boundary line between confined and deconfined quark
phases.Comment: 18 pages, 10 figures, accepted for publication in JHE
|
The QCD phase diagram in the limit of heavy quarks using complex
Langevin dynamics
|
the qcd phase diagram in the limit of heavy quarks using complex langevin dynamics
|
langevin exhibit thereby potentially principles. quarks potentials. adaptive cooling prevents excursions directions mathbb manifold. excursions spontaneously observables disagreement results. excursions sufficiently confined deconfined pages publication
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non_dup
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42740603
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10.1007/JHEP09(2016)088
|
We propose a geometric method to study the residual symmetries in $N=2$,
$d=4$ $\text{U}(1)$ Fayet-Iliopoulos (FI) gauged supergravity. It essentially
involves the stabilization of the symplectic vector of gauge couplings (FI
parameters) under the action of the U-duality symmetry of the ungauged theory.
In particular we are interested in those transformations that act non-trivially
on the solutions and produce scalar hair and dyonic black holes from a given
seed. We illustrate the procedure for finding this group in general and then
show how it works in some specific models. For the prepotential $F=-iX^0X^1$,
we use our method to add one more parameter to the rotating Chow-Comp\`ere
solution, representing scalar hair.Comment: 31 pages, uses jheppub.sty. Final version to appear on JHE
|
Duality invariance in Fayet-Iliopoulos gauged supergravity
|
duality invariance in fayet-iliopoulos gauged supergravity
|
propose geometric residual symmetries fayet iliopoulos gauged supergravity. essentially involves stabilization symplectic couplings duality ungauged theory. interested transformations trivially hair dyonic holes seed. illustrate models. prepotential rotating chow comp representing pages jheppub.sty.
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non_dup
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[] |
42707200
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10.1007/JHEP09(2016)090
|
We investigate quantum phase transitions in a 2+1 dimensional gauge theory at
finite chemical potential $\chi$ and magnetic field $B$. The gravity dual is
based on 4D $\mathcal{N}=2$ Fayet-Iliopoulos gauged supergravity and the
solutions we consider---that are constructed analytically---are extremal,
dyonic, asymptotically $AdS_4$ black-branes with a nontrivial radial profile
for the scalar field. We discover a line of second order fixed points at
$B=B_c(\chi)$ between the dyonic black brane and an extremal "thermal gas"
solution with a singularity of good-type, according to the acceptability
criteria of Gubser [1]. The dual field theory is the ABJM theory [2] deformed
by a triple trace operator $\Phi^3$ and placed at finite charge and magnetic
field. This line of fixed points might be useful in studying the various
strongly interacting quantum critical phenomena such as the ones proposed to
underlie the cuprate superconductors. We also find curious similarities between
the behaviour of the VeV $\langle \Phi \rangle$ under B and that of the quark
condensate in 2+1 dimensional NJL models.Comment: 33 pages, 7 figure
|
A magnetically induced quantum phase transition in holography
|
a magnetically induced quantum phase transition in holography
|
mathcal fayet iliopoulos gauged supergravity analytically extremal dyonic asymptotically branes nontrivial field. discover dyonic brane extremal singularity acceptability gubser abjm deformed triple trace placed field. studying interacting phenomena underlie cuprate superconductors. curious similarities langle rangle condensate pages
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non_dup
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[] |
42715273
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10.1007/JHEP09(2016)091
|
We present the calculation of the master integrals needed for the two-loop
QCDxEW corrections to $ q + \bar{q} \to l^- + l^+$ and $ q + \bar{q}' \to l^- +
\overline{\nu} \, , $ for massless external particles. We treat W and Z bosons
as degenerate in mass. We identify three types of diagrams, according to the
presence of massive internal lines: the no-mass type, the one-mass type, and
the two-mass type, where all massive propagators, when occurring, contain the
same mass value. We find a basis of 49 master integrals and evaluate them with
the method of the differential equations. The Magnus exponential is employed to
choose a set of master integrals that obeys a canonical system of differential
equations. Boundary conditions are found either by matching the solutions onto
simpler integrals in special kinematic configurations, or by requiring the
regularity of the solution at pseudo-thresholds. The canonical master integrals
are finally given as Taylor series around d=4 space-time dimensions, up to
order four, with coefficients given in terms of iterated integrals,
respectively up to weight four.Comment: 1+45 pages, 6 figures, 1 table, 5 ancillary file
|
Two-Loop Master Integrals for the mixed EW-QCD virtual corrections to
Drell-Yan scattering
|
two-loop master integrals for the mixed ew-qcd virtual corrections to drell-yan scattering
|
master integrals qcdxew overline massless particles. treat bosons degenerate mass. diagrams massive massive propagators occurring value. master integrals equations. magnus exponential master integrals obeys canonical equations. matching simpler integrals kinematic configurations requiring regularity pseudo thresholds. canonical master integrals taylor iterated integrals pages ancillary file
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non_dup
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[] |
42697960
|
10.1007/JHEP09(2016)092
|
We construct effective field theories for gapped quantum Hall systems coupled
to background geometries with local Galilean invariance i.e. Bargmann
spacetimes. Along with an electromagnetic field, these backgrounds include the
effects of curved Galilean spacetimes, including torsion and a gravitational
field, allowing us to study charge, energy, stress and mass currents within a
unified framework. A shift symmetry specific to single constituent theories
constraints the effective action to couple to an effective background gauge
field and spin connection that is solved for by a self-consistent equation,
providing a manifestly covariant extension of Hoyos and Son's improvement terms
to arbitrary order in $m$.Comment: v2: updated version published in JHEP; v1: 25 pages + Appendi
|
Covariant effective action for a Galilean invariant quantum Hall system
|
covariant effective action for a galilean invariant quantum hall system
|
gapped hall geometries galilean invariance i.e. bargmann spacetimes. electromagnetic backgrounds curved galilean spacetimes torsion gravitational allowing currents unified framework. constituent couple connection solved manifestly covariant hoyos .comment updated jhep pages appendi
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non_dup
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[] |
42702017
|
10.1007/JHEP09(2016)093
|
Large mass splittings between new scalars in two-Higgs-doublet models (2HDM)
open a key avenue to search for these new states via exotic heavy Higgs decays.
We discuss in detail the different search channels for these new scalars at the
LHC in the presence of a sizable mass splitting, i.e. a hierarchical 2HDM
scenario, taking into account the theoretical and experimental constraints. We
provide benchmark planes to exploit the complementarity among these searches,
analyzing their potential to probe the hierarchical 2HDM parameter space during
LHC Run 2
|
Anatomy of Exotic Higgs Decays in 2HDM
|
anatomy of exotic higgs decays in 2hdm
|
splittings scalars doublet avenue exotic decays. scalars sizable splitting i.e. hierarchical constraints. benchmark planes exploit complementarity searches analyzing hierarchical
|
non_dup
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[] |
73347338
|
10.1007/JHEP09(2016)094
|
We prove that the scattering equation formalism for Yang-Mills amplitudes can
be used to make manifest the theory's color-kinematics duality. This is
achieved through a concrete reduction algorithm which renders this duality
manifest term-by-term. The reduction follows from the recently derived set of
identities for amplitudes expressed in the scattering equation formalism that
are analogous to monodromy relations in string theory. A byproduct of our
algorithm is a generalization of the identities among gravity and Yang-Mills
amplitudes.Comment: 20 pages, 20 figure
|
Manifesting Color-Kinematics Duality in the Scattering Equation
Formalism
|
manifesting color-kinematics duality in the scattering equation formalism
|
formalism mills amplitudes manifest kinematics duality. concrete renders duality manifest term. identities amplitudes formalism analogous monodromy theory. byproduct generalization identities mills pages
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non_dup
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[] |
42752596
|
10.1007/JHEP09(2016)095
|
We discuss in detail level/rank duality in three-dimensional Chern-Simons
theories and various related dualities in three-dimensional Chern-Simons-matter
theories. We couple the dual Lagrangians to appropriate background fields
(including gauge fields, spin$_c$ connections and the metric). The non-trivial
maps between the currents and the line operators in the dual theories is
accounted for by mixing of these fields. In order for the duality to be valid
we must add finite counterterms depending on these background fields. This
analysis allows us to resolve a number of puzzles with these dualities, to
provide derivations of some of them, and to find new consistency conditions and
relations between them. In addition, we find new level/rank dualities of
topological Chern-Simons theories and new dualities of Chern-Simons-matter
theories, including new boson/boson and fermion/fermion dualities.Comment: 36 pages, clarifications about the fixed point with several flavor
|
Level/rank Duality and Chern-Simons-Matter Theories
|
level/rank duality and chern-simons-matter theories
|
duality chern simons dualities chern simons theories. couple lagrangians connections trivial currents accounted fields. duality valid counterterms fields. resolve puzzles dualities derivations consistency them. dualities topological chern simons dualities chern simons boson boson fermion fermion pages clarifications flavor
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non_dup
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[] |
42657143
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10.1007/JHEP09(2016)096
|
Dark matter may be coupled to dark radiation: light degrees of freedom that
mediate forces between dark sector particles. Cosmological constraints favor
dark radiation that is colder than Standard Model radiation. In models with
fixed couplings between dark matter and the Standard Model, these constraints
can be difficult to satisfy if thermal equilibrium is assumed in the early
universe. We construct a model of asymmetric reheating of the visible and dark
sectors from late decays of a long-lived particle (for instance, a modulus). We
show, as a proof-of-principle, that such a model can populate a sufficiently
cold dark sector while also generating baryon and dark matter asymmetries
through the out of equilibrium decay. We frame much of our discussion in terms
of the scenario of dissipative dark matter, as in the Double-Disk Dark Matter
scenario. However, our results may also be of interest for other scenarios like
the Twin Higgs model that are in danger of overproducing dark radiation due to
nonnegligible dark-visible couplings.Comment: v2: accepted by JHEP; added discussion of baryon violation
constraints, some correction
|
Nonthermal production of dark radiation and dark matter
|
nonthermal production of dark radiation and dark matter
|
freedom mediate forces particles. cosmological favor colder radiation. couplings satisfy universe. asymmetric reheating visible sectors decays lived modulus populate sufficiently cold generating baryon asymmetries decay. dissipative scenario. scenarios twin danger overproducing nonnegligible visible jhep baryon violation
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non_dup
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[] |
73352937
|
10.1007/JHEP09(2016)098
|
We perform several tests on a recent proposal by Shifman and Stepanyantz for
an exact expression for the current correlation functions in supersymmetric
gauge theories. We clarify the meaning of the relation in superconformal
theories. In particular we show that it automatically follows from known
relations between the current correlation functions and anomalies. It therefore
also automatically matches between different dual realizations of the same
superconformal theory. We use holographic examples as well as calculations in
free theories to show that the proposed relation fails in theories with mass
terms.Comment: 13 page
|
Supersymmetric Adler Functions and Holography
|
supersymmetric adler functions and holography
|
proposal shifman stepanyantz supersymmetric theories. clarify meaning superconformal theories. automatically anomalies. automatically matches realizations superconformal theory. holographic fails
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non_dup
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[] |
42694691
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10.1007/JHEP09(2016)099
|
The analytic continuation from the Euclidean domain to real space of the
one-particle irreducible quantum effective action is discussed in the context
of generalized local equilibrium states. Discontinuous terms associated with
dissipative behavior are parametrized in terms of a conveniently defined sign
operator. A generalized variational principle is then formulated, which allows
to obtain causal and real dissipative equations of motion from the analytically
continued quantum effective action. Differential equations derived from the
implications of general covariance determine the space-time evolution of the
temperature and fluid velocity fields and allow for a discussion of entropy
production including a local form of the second law of thermodynamics.Comment: 34 pages, improved discussion of dissipative terms in energy momentum
tensor, references adde
|
Variational principle for theories with dissipation from analytic
continuation
|
variational principle for theories with dissipation from analytic continuation
|
analytic continuation euclidean irreducible states. discontinuous dissipative parametrized conveniently operator. variational formulated causal dissipative analytically continued action. covariance pages dissipative adde
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non_dup
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[] |
42750842
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10.1007/JHEP09(2016)100
|
We prove that non-extremal black holes in four-dimensional general relativity
exhibit an infinite-dimensional symmetry in their near horizon region. By
prescribing a physically sensible set of boundary conditions at the horizon, we
derive the algebra of asymptotic Killing vectors, which is shown to be
infinite-dimensional and includes, in particular, two sets of supertranslations
and two mutually commuting copies of the Virasoro algebra. We define the
surface charges associated to the asymptotic diffeomorphisms that preserve the
boundary conditions and discuss the subtleties of this definition, such as the
integrability conditions and the correct definition of the Dirac brackets. When
evaluated on the stationary solutions, the only non-vanishing charges are the
zero-modes. One of them reproduces the Bekenstein-Hawking entropy of Kerr black
holes. We also study the extremal limit, recovering the NHEK geometry. In this
singular case, where the algebra of charges and the integrability conditions
get modified, we find that the computation of the zero-modes correctly
reproduces the black hole entropy. Furthermore, we analyze the case of three
spacetime dimensions, in which the integrability conditions notably simplify
and the field equations can be solved analytically to produce a family of exact
solutions that realize the boundary conditions explicitly. We examine other
features, such as the form of the algebra in the extremal limit and the
relation to other works in the literature.Comment: 24 pages, minor correction
|
Extended Symmetries at the Black Hole Horizon
|
extended symmetries at the black hole horizon
|
extremal holes relativity exhibit infinite horizon region. prescribing physically sensible horizon derive asymptotic killing infinite supertranslations mutually commuting copies virasoro algebra. charges asymptotic diffeomorphisms preserve subtleties integrability dirac brackets. stationary vanishing charges modes. reproduces bekenstein hawking kerr holes. extremal recovering nhek geometry. singular charges integrability correctly reproduces entropy. analyze spacetime integrability notably simplify solved analytically realize explicitly. examine extremal pages minor
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non_dup
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[] |
42689267
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10.1007/JHEP09(2016)101
|
We re-examine a closed-string model defined by altering the boundary
conditions for one handedness of two-dimensional propagators in
otherwise-standard string theory. We evaluate the amplitudes using
Kawai-Lewellen-Tye factorization into open-string amplitudes. The only
modification to standard string theory is effectively that the spacetime
Minkowski metric changes overall sign in one open-string factor. This cancels
all but a finite number of states: As found in earlier approaches, with enough
supersymmetry (e.g., type II) the tree amplitudes reproduce those of the
massless truncation of ordinary string theory. However, we now find for the
other cases that additional fields, formerly thought to be auxiliary, describe
new spin-2 states at the two adjacent mass levels (tachyonic and tardyonic).
The tachyon is always a ghost, but can be avoided in the heterotic case.Comment: v2: minor corrections; discussion section modified; more references
adde
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Factorization of Chiral String Amplitudes
|
factorization of chiral string amplitudes
|
examine altering handedness propagators theory. amplitudes kawai lewellen factorization amplitudes. modification effectively spacetime minkowski factor. cancels supersymmetry e.g. amplitudes reproduce massless truncation ordinary theory. formerly thought auxiliary adjacent tachyonic tardyonic tachyon ghost avoided heterotic minor adde
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non_dup
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[] |
42673972
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10.1007/JHEP09(2016)102
|
We consider the problem of defining localized subsystems in gauge theory and
gravity. Such systems are associated to spacelike hypersurfaces with boundaries
and provide the natural setting for studying entanglement entropy of regions of
space. We present a general formalism to associate a gauge-invariant classical
phase space to a spatial slice with boundary by introducing new degrees of
freedom on the boundary. In Yang-Mills theory the new degrees of freedom are a
choice of gauge on the boundary, transformations of which are generated by the
normal component of the nonabelian electric field. In general relativity the
new degrees of freedom are the location of a codimension-2 surface and a choice
of conformal normal frame. These degrees of freedom transform under a group of
surface symmetries, consisting of diffeomorphisms of the codimension-2
boundary, and position-dependent linear deformations of its normal plane. We
find the observables which generate these symmetries, consisting of the
conformal normal metric and curvature of the normal connection. We discuss the
implications for the problem of defining entanglement entropy in quantum
gravity. Our work suggests that the Bekenstein-Hawking entropy may arise from
the different ways of gluing together two partial Cauchy surfaces at a
cross-section of the horizon.Comment: 46 pages. v2: Error corrected in appendix B, results unchange
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Local subsystems in gauge theory and gravity
|
local subsystems in gauge theory and gravity
|
defining localized subsystems gravity. spacelike hypersurfaces boundaries studying entanglement space. formalism associate slice introducing freedom boundary. mills freedom transformations nonabelian field. relativity freedom codimension conformal frame. freedom transform symmetries consisting diffeomorphisms codimension deformations plane. observables symmetries consisting conformal curvature connection. defining entanglement gravity. bekenstein hawking arise ways gluing cauchy pages. corrected unchange
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non_dup
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[] |
42752441
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10.1007/JHEP09(2016)103
|
Melnikov's method is an analytical way to show the existence of classical
chaos generated by a Smale horseshoe. It is a powerful technique, though its
applicability is somewhat limited. In this paper, we present a solution of type
IIB supergravity to which Melnikov's method is applicable. This is a brane-wave
type deformation of the AdS$_5\times$S$^5$ background. By employing two
reduction ans\"atze, we study two types of coupled pendulum-oscillator systems.
Then the Melnikov function is computed for each of the systems by following the
standard way of Holmes and Marsden and the existence of chaos is shown
analytically.Comment: 37 pages, 5 figure
|
Melnikov's method in String Theory
|
melnikov's method in string theory
|
melnikov chaos smale horseshoe. powerful applicability somewhat limited. supergravity melnikov applicable. brane deformation background. employing atze pendulum oscillator systems. melnikov holmes marsden chaos pages
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non_dup
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[] |
42725786
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10.1007/JHEP09(2016)104
|
We consider a class of topological defects in $(1,1)$-dimensions with a
deformed $\phi^4$ kink structure whose stability analysis leads to a
Schr\"odinger-like equation with a zero-mode and at least one vibrational
(shape) mode. We are interested in the dynamics of kink-antikink collisions,
focusing on the structure of two-bounce windows. For small deformation and for
one or two vibrational modes, the observed two-bounce windows are explained by
the standard mechanism of a resonant effect between the first vibrational and
the translational modes. With the increasing of the deformation, the effect of
the appearance of more than one vibrational mode is the gradual disappearance
of the initial two-bounce windows. The total suppression of two-bounce windows
even with the presence of a vibrational mode offers a counterexample from what
expected from the standard mechanism. For even larger deformation, some
two-bounce windows reappear, but with a non-standard structure.Comment: 13 pages, 6 figure
|
Suppression of two-bounce windows in kink-antikink collisions
|
suppression of two-bounce windows in kink-antikink collisions
|
topological defects deformed kink schr odinger vibrational mode. interested kink antikink collisions focusing bounce windows. deformation vibrational bounce windows resonant vibrational translational modes. deformation appearance vibrational gradual disappearance bounce windows. suppression bounce windows vibrational offers counterexample mechanism. deformation bounce windows reappear pages
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non_dup
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[] |
42702949
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10.1007/JHEP09(2016)105
|
We present exact large N calculus of four point function in general
Chern-Simons bosonic and fermionic vector models. Applying the LSZ formula to
the four point function we determine two body scattering amplitudes in these
theories taking a special care for a non-analytic term to achieve unitarity in
the singlet channel. We show that the S-matrix enjoys the bosonization duality,
unusual crossing relation and non-relativistic reduction to Aharonov-Bohm
scattering. We also argue that the S-matrix develops a pole in a certain range
of coupling constants, which disappears in the range where the theory reduces
to Chern-Simons theory interacting with free fermions.Comment: 1+28 pages, 5 figures, v2: minor correction
|
Scattering Amplitude and Bosonization Duality in General Chern-Simons
Vector Models
|
scattering amplitude and bosonization duality in general chern-simons vector models
|
calculus chern simons bosonic fermionic models. amplitudes analytic unitarity singlet channel. enjoys bosonization duality unusual crossing relativistic aharonov bohm scattering. argue develops pole disappears reduces chern simons interacting pages minor
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non_dup
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[] |
73350977
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10.1007/JHEP09(2016)106
|
We present for the first time a ghost-free higher-derivative chiral model
with a propagating auxiliary F-term field (highest component of the chiral
multiplet). We obtain this model by removing a ghost in a higher derivative
chiral model, with Higgsing it in terms of an auxiliary vector superfield.
Depending on the sign of the quadratic derivative term of the chiral
superfield, the model contains two ghost free branches of the parameter
regions. We find that supersymmetry is spontaneously broken in one branch while
it is preserved in the other branch. As a consequence of dynamical F-term
field, a conserved U(1) charge corresponding to the number density of $F$
appears, which can be regarded as a generalization of the R-symmetry.Comment: 15 pages, v2:references adde
|
Ghostbusters in higher derivative supersymmetric theories: who is afraid
of propagating auxiliary fields?
|
ghostbusters in higher derivative supersymmetric theories: who is afraid of propagating auxiliary fields?
|
ghost chiral propagating auxiliary chiral multiplet removing ghost chiral higgsing auxiliary superfield. quadratic chiral superfield ghost branches regions. supersymmetry spontaneously broken branch preserved branch. conserved regarded generalization pages adde
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non_dup
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[] |
42747624
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10.1007/JHEP09(2016)110
|
The presence of non-unitary neutrino mixing can affect the measurement of the
three-neutrino leptonic Dirac CP phase and hamper efforts to probe CP violation
due to degeneracies of the extra non-unitary CP phase with the standard CP
phase. We study the effect of including non-unitarity on probing CP violation
with the long-baseline experiments NO$\nu$A, T2K and DUNE. We analyze the
effect of non-unitary mixing at the level of oscillation probabilities
associated with the relevant baselines, and present the CP violation
sensitivity for the individual experiments and their combination. Our results
show that there is an improvement in the CP violation sensitivity of the
combination compared to the individual experiments.Comment: 22 pages, 9 figure
|
Probing CP violation with T2K, NO$\nu$A and DUNE in the presence of
non-unitarity
|
probing cp violation with t2k, no$\nu$a and dune in the presence of non-unitarity
|
unitary leptonic dirac hamper efforts violation degeneracies extra unitary phase. unitarity probing violation dune. analyze unitary oscillation probabilities baselines violation combination. violation pages
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non_dup
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[] |
42723334
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10.1007/JHEP09(2016)111
|
We investigate the possibility of gauge coupling unification in various
radiative neutrino mass models, which generate neutrino masses at one- and/or
two-loop level. Renormalization group running of gauge couplings is performed
analytically and numerically at one- and two-loop order, respectively. We study
three different classes of neutrino mass models: (I) minimal ultraviolet
completions of the dimension-7 $\Delta L=2$ operators which generate neutrino
masses at one- and/or two-loop level without and with dark matter candidates,
(II) models with dark matter which lead to neutrino masses at one-loop level
and (III) models with particles in the adjoint representation of
$\mathrm{SU}(3)$. In class (I), gauge couplings unify in a few models and
adding dark matter amplifies the chances for unification. In class (II), about
a quarter of the models admit gauge coupling unification. In class (III), none
of the models leads to gauge coupling unification. Regarding the scale of
unification, we find values between $10^{14}$ GeV and $10^{16}$ GeV for models
belonging to class (I) without dark matter, whereas models in class (I) with
dark matter as well as models of class (II) prefer values in the range $5 \cdot
10^{10}-5 \cdot 10^{14}$ GeV.Comment: 28 pages, 2 figures. Updated to match journal versio
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Unification of Gauge Couplings in Radiative Neutrino Mass Models
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unification of gauge couplings in radiative neutrino mass models
|
unification radiative level. renormalization running couplings analytically numerically respectively. ultraviolet completions delta candidates adjoint mathrm couplings unify adding amplifies chances unification. quarter admit unification. none unification. unification belonging prefer cdot cdot pages figures. updated match versio
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non_dup
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[] |
42738251
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10.1007/JHEP09(2016)112
|
We evaluate in the framework of QCD factorization the two-loop vertex
corrections to the decays $\bar{B}_{(s)}\to D_{(s)}^{(\ast)+} \, L^-$ and
$\Lambda_b \to \Lambda_c^+ \, L^-$, where $L$ is a light meson from the set
$\{\pi,\rho,K^{(\ast)},a_1\}$. These decays are paradigms of the QCD
factorization approach since only the colour-allowed tree amplitude contributes
at leading power. Hence they are sensitive to the size of power corrections
once their leading-power perturbative expansion is under control. Here we
compute the two-loop ${\cal O}(\alpha_s^2)$ correction to the leading-power
hard scattering kernels, and give the results for the convoluted kernels almost
completely analytically. Our newly computed contribution amounts to a positive
shift of the magnitude of the tree amplitude by $\sim 2$\%. We then perform an
extensive phenomenological analysis to NNLO in QCD factorization, using the
most recent values for non-perturbative input parameters. Given the fact that
the NNLO perturbative correction and updated values for form factors increase
the theory prediction for branching ratios, while experimental central values
have at the same time decreased, we reanalyze the role and potential size of
power corrections by means of appropriately chosen ratios of decay channels.Comment: 38 pages, 5 tables, 4 figures. v2: Added explicit numbers for
semi-leptonic rates that enter the factorization test, plus a few more minor
adjustments. Matches version accepted by JHE
|
Two-body non-leptonic heavy-to-heavy decays at NNLO in QCD factorization
|
two-body non-leptonic heavy-to-heavy decays at nnlo in qcd factorization
|
factorization decays lambda lambda meson decays paradigms factorization colour contributes power. perturbative control. alpha kernels convoluted kernels analytically. newly amounts extensive phenomenological nnlo factorization perturbative parameters. nnlo perturbative updated branching reanalyze appropriately pages tables figures. leptonic enter factorization minor adjustments. matches
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non_dup
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[] |
73350218
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10.1007/JHEP09(2016)113
|
This paper contains some new results on the hadronic light-by-light
contribution (HLbL) to the muon $g-2$. The first part argues that we can expect
large effects from disconnected diagrams in present and future calculations by
lattice QCD of HLbL. The argument is based on the dominance of pseudo-scalar
meson exchange.
In the second part, we revisit the pion loop HLbL contribution to the muon
anomalous magnetic moment. We study it in the framework of some models studied
earlier, pure pion loop, full VMD and hidden local symmetry for inclusion of
vector mesons. In addition we study possible ways to include the axial-vector
meson. The main part of the work is a detailed study of how the different
momentum regions contribute. We derive a short distance constraint on the
$\gamma^*\gamma^*\to\pi\pi$ amplitude and use this as a constraint on the
models used for the pion loop. As a byproduct we present the general result for
integration using the Gegenbauer polynomial method.Comment: 26 page
|
Pion light-by-light contributions to the muon $g-2$
|
pion light-by-light contributions to the muon $g-2$
|
hadronic hlbl muon argues disconnected diagrams hlbl. argument dominance pseudo meson exchange. revisit pion hlbl muon anomalous moment. pion hidden inclusion mesons. ways axial meson. contribute. derive gamma gamma pion loop. byproduct gegenbauer
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non_dup
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[] |
42752491
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10.1007/JHEP09(2016)115
|
We present a consistent renormalization scheme for the CP-conserving
Two-Higgs-Doublet Model based on $\overline{MS}$ renormalization of the mixing
angles and the soft-$Z_2$-symmetry-breaking scale $M_{sb}$ in the Higgs sector.
This scheme requires to treat tadpoles fully consistently in all steps of the
calculation in order to provide gauge-independent $S$-matrix elements. We show
how bare physical parameters have to be defined and verify the gauge
independence of physical quantities by explicit calculations in a general
$R_{\xi}$-gauge. The procedure is straightforward and applicable to other
models with extended Higgs sectors. In contrast to the proposed scheme, the
$\overline{MS}$ renormalization of the mixing angles combined with popular
on-shell renormalization schemes gives rise to gauge-dependent results already
at the one-loop level. We present explicit results for electroweak NLO
corrections to selected processes in the appropriately renormalized
Two-Higgs-Doublet Model and in particular discuss their scale dependence.Comment: 52 pages, PDFLaTeX, PDF figures, JHEP version with Eq. (5.23)
correcte
|
Gauge-independent $\overline{MS}$ renormalization in the 2HDM
|
gauge-independent $\overline{ms}$ renormalization in the 2hdm
|
renormalization conserving doublet overline renormalization angles breaking sector. treat tadpoles consistently elements. bare verify independence quantities gauge. straightforward applicable sectors. overline renormalization angles popular renormalization schemes level. electroweak appropriately renormalized doublet pages pdflatex jhep correcte
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non_dup
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[] |
42678982
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10.1007/JHEP09(2016)116
|
We study the properties of 4d N=3 superconformal field theories whose rank is
one, i.e. those that reduce to a single vector multiplet on their moduli space
of vacua. We find that the moduli space can only be of the form C^3/Z_k for
k=1,2,3,4,6, and that the supersymmetry automatically enhances to N=4 for
k=1,2. In addition, we determine the central charges a and c in terms of k, and
construct the associated 2d chiral algebras, which turn out to be exotic N=2
supersymmetric W-algebras.Comment: 24 page
|
On 4d rank-one N=3 superconformal field theories
|
on 4d rank-one n=3 superconformal field theories
|
superconformal i.e. multiplet moduli vacua. moduli supersymmetry automatically enhances charges chiral algebras exotic supersymmetric
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non_dup
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[] |
42738849
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10.1007/JHEP09(2016)117
|
We consider an $O(N)$ scalar field model with quartic interaction in
$d$-dimensional Euclidean de Sitter space. In order to avoid the problems of
the standard perturbative calculations for light and massless fields, we
generalize to the $O(N)$ theory a systematic method introduced previously for a
single field, which treats the zero modes exactly and the nonzero modes
perturbatively. We compute the two-point functions taking into account not only
the leading infrared contribution, coming from the self-interaction of the zero
modes, but also corrections due to the interaction of the ultraviolet modes.
For the model defined in the corresponding Lorentzian de Sitter spacetime, we
obtain the two-point functions by analytical continuation. We point out that a
partial resummation of the leading secular terms (which necessarily involves
nonzero modes) is required to obtain a decay at large distances for massless
fields. We implement this resummation along with a systematic double expansion
in an effective coupling constant $\sqrt\lambda$ and in 1/N. We explicitly
perform the calculation up to the next-to-next-to-leading order in
$\sqrt\lambda$ and up to next-to-leading order in 1/N. The results reduce to
those known in the leading infrared approximation. We also show that they
coincide with the ones obtained directly in Lorentzian de Sitter spacetime in
the large N limit, provided the same renormalization scheme is used.Comment: 31 pages, 5 figures. Minor changes. Published versio
|
$O(N)$ model in Euclidean de Sitter space: beyond the leading infrared
approximation
|
$o(n)$ model in euclidean de sitter space: beyond the leading infrared approximation
|
quartic euclidean sitter space. avoid perturbative massless generalize treats nonzero perturbatively. infrared coming ultraviolet modes. lorentzian sitter spacetime continuation. resummation secular necessarily involves nonzero distances massless fields. implement resummation sqrt lambda explicitly sqrt lambda infrared approximation. coincide lorentzian sitter spacetime renormalization pages figures. minor changes. versio
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non_dup
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[] |
73352007
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10.1007/JHEP09(2016)118
|
The anomalies recently found by the LHCb collaboration in $B$-meson decays
seem to point towards the existence of new physics coupled non-universally to
muons and electrons. We show that a beyond-the-Standard-Model dynamics with
these features naturally arises in models with a warped extra-dimension that
aim to solve the electroweak Hierarchy Problem. The attractiveness of our
set-up is the fact that the dynamics responsible for generating the flavor
anomalies is automatically present, being provided by the massive Kaluza--Klein
excitations of the electroweak gauge bosons. The flavor anomalies can be easily
reproduced by assuming that the bottom and muon fields have a sizable amount of
compositeness, while the electron is almost elementary. Interestingly enough,
this framework correlates the flavor anomalies to a pattern of corrections in
the electroweak observables and in flavor-changing processes. In particular the
deviations in the bottom and muon couplings to the $Z$-boson and in $\Delta F =
2$ flavor-changing observables are predicted to be close to the present
experimental bounds, and thus potentially testable in near-future experiments.Comment: 33 pages, 14 figures, 1 table. References adde
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A Natural origin for the LHCb anomalies
|
a natural origin for the lhcb anomalies
|
anomalies lhcb meson decays seem universally muons electrons. naturally arises warped extra solve electroweak hierarchy problem. attractiveness generating flavor anomalies automatically massive kaluza klein excitations electroweak bosons. flavor anomalies reproduced muon sizable compositeness elementary. interestingly correlates flavor anomalies electroweak observables flavor changing processes. deviations muon couplings boson delta flavor changing observables bounds potentially testable pages table. adde
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non_dup
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42746804
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10.1007/JHEP09(2016)119
|
We study possible string theory compactifications which, in the low-energy
limit, describe chaotic inflation with a stabilizer field. We first analyze
type IIA setups where the inflationary potential arises from a D6-brane
wrapping an internal three-cycle, and where the stabilizer field is either an
open-string or bulk K\"ahler modulus. We find that after integrating out the
relevant closed-string moduli consistently, tachyonic directions arise during
inflation which cannot be lifted. This is ultimately due to the shift
symmetries of the type IIA K\"ahler potential at large compactification volume.
This motivates us to search for stabilizer candidates in the complex structure
sector of type IIB orientifolds, since these fields couple to D7-brane Wilson
lines and their shift symmetries are generically broken away from the large
complex structure limit. However, we find that in these setups the challenge is
to obtain the necessary hierarchy between the inflationary and Kaluza-Klein
scales.Comment: 26 pages, typos corrected and comments added. Published versio
|
Challenges for D-brane large-field inflation with stabilizer fields
|
challenges for d-brane large-field inflation with stabilizer fields
|
compactifications chaotic inflation stabilizer field. analyze setups inflationary arises brane wrapping stabilizer ahler modulus. integrating moduli consistently tachyonic directions arise inflation lifted. ultimately symmetries ahler compactification volume. motivates stabilizer candidates orientifolds couple brane wilson symmetries generically broken away limit. setups challenge hierarchy inflationary kaluza klein pages typos corrected comments added. versio
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non_dup
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[] |
42706051
|
10.1007/JHEP09(2016)120
|
We study the 6d N=(0,2) superconformal field theory, which describes multiple
M5-branes, on the product space S^2 x M_4, and suggest a correspondence between
a 2d N=(0,2) half-twisted gauge theory on S^2 and a topological sigma-model on
the four-manifold M_4. To set up this correspondence, we determine in this
paper the dimensional reduction of the 6d N=(0,2) theory on a two-sphere and
derive that the four-dimensional theory is a sigma-model into the moduli space
of solutions to Nahm's equations, or equivalently the moduli space of
k-centered SU(2) monopoles, where k is the number of M5-branes. We proceed in
three steps: we reduce the 6d abelian theory to a 5d Super-Yang-Mills theory on
I x M_4, with I an interval, then non-abelianize the 5d theory and finally
reduce this to 4d. In the special case, when M_4 is a Hyper-Kahler manifold, we
show that the dimensional reduction gives rise to a topological sigma-model
based on tri-holomorphic maps. Deriving the theory on a general M_4 requires
knowledge of the metric of the target space. For k=2 the target space is the
Atiyah-Hitchin manifold and we twist the theory to obtain a topological
sigma-model, which has both scalar fields and self-dual two-forms.Comment: 78 pages, 2 figure
|
M5-branes on S^2 x M_4: Nahm's Equations and 4d Topological Sigma-models
|
m5-branes on s^2 x m_4: nahm's equations and 4d topological sigma-models
|
superconformal describes branes correspondence twisted topological sigma manifold correspondence sphere derive sigma moduli nahm equivalently moduli centered monopoles branes. proceed abelian super mills abelianize hyper kahler manifold topological sigma holomorphic maps. deriving space. atiyah hitchin manifold twist topological sigma pages
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non_dup
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42753656
|
10.1007/JHEP09(2016)121
|
The partition function of 2d conformal field theory is a modular invariant
function. It is known that the partition function of a holomorphic CFT whose
central charge is a multiple of 24 is a polynomial in the Klein function. In
this paper, by using the medium temperature expansion we show that every
modular invariant partition function can be mapped to a holomorphic partition
function whose structure can be determined similarly. We use this map to study
partition function of CFTs with half-integer left and right conformal weights.
We show that the corresponding left and right central charges are necessarily
multiples of 4. Furthermore, the degree of degeneracy of high-energy levels can
be uniquely determined in terms of the degeneracy in the low energy states.Comment: v2: 19 pages, few footnotes and a reference added, to appear in JHE
|
Non-chiral 2d CFT with integer energy levels
|
non-chiral 2d cft with integer energy levels
|
partition conformal modular function. partition holomorphic klein function. modular partition mapped holomorphic partition similarly. partition cfts integer conformal weights. charges necessarily multiples degeneracy uniquely degeneracy pages footnotes
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non_dup
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[] |
42689303
|
10.1007/JHEP09(2016)122
|
Negative magnetoresistivity is a special magnetotransport property associated
with chiral anomaly in four dimensional chiral anomalous systems, which refers
to the transport behavior that the DC longitudinal magnetoresistivity decreases
with increasing magnetic field. We calculate the longitudinal
magnetoconductivity in the presence of backreactions of the magnetic field to
gravity in holographic zero charge and axial charge density systems with and
without axial charge dissipation. In the absence of axial charge dissipation,
we find that the quantum critical conductivity grows with increasing magnetic
field when the backreaction strength is larger than a critical value, in
contrast to the monotonically decreasing behavior of quantum critical
conductivity in the probe limit. With axial charge dissipation, we find the
negative magnetoresistivity behavior. The DC longitudinal magnetoconductivity
scales as $B$ in the large magnetic field limit, which deviates from the exact
$B^2$ scaling of the probe limit result. In both cases, the small frequency
longitudinal magnetoconductivity still agrees with the formula obtained from
the hydrodynamic linear response theory, even in the large magnetic field
limit.Comment: 33 pages, 13 figures; v2, minor change, version to appear in JHE
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Negative magnetoresistivity in holography
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negative magnetoresistivity in holography
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magnetoresistivity magnetotransport chiral anomaly chiral anomalous refers longitudinal magnetoresistivity field. longitudinal magnetoconductivity backreactions holographic axial axial dissipation. axial dissipation conductivity grows backreaction monotonically decreasing conductivity limit. axial dissipation magnetoresistivity behavior. longitudinal magnetoconductivity deviates result. longitudinal magnetoconductivity agrees hydrodynamic pages minor
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non_dup
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42668953
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10.1007/JHEP09(2016)124
|
We study the first law of black hole thermodynamics in the presence of
surrounding gravitational fields and argue that variations of these fields are
naturally incorporated in the first law by defining gravitational tension or
gravitational binding energy. We demonstrate that this notion can also be
applied in Anti-de Sitter spacetime, in which the surrounding gravitational
field is sourced by a cosmological fluid, therefore showing that spacetime
volume and gravitational tension encode the same physics as spacetime pressure
and black hole volume. We furthermore show that it is possible to introduce a
definition of spacetime pressure and black hole volume for any spacetime with
characteristic length scales which does not necessarily require a cosmological
constant sourcing Einstein equations. However, we show that black hole volume
is non-universal in the flat spacetime limit, questioning its significance. We
illustrate these ideas by studying the resulting black hole volume of
Kaluza-Klein black holes and of a toy model for a black hole binary system in
five spacetime dimensions (the black saturn solution) as well as of several
novel perturbative black hole solutions. These include the higher-dimensional
Kerr-Newman solution in Anti-de Sitter spacetime as well as other black holes
in plane wave and Lifshitz spacetimes.Comment: v3: 42pp, improved discussion in section 6, to be published in JHE
|
Gravitational Tension, Spacetime Pressure and Black Hole Volume
|
gravitational tension, spacetime pressure and black hole volume
|
thermodynamics surrounding gravitational argue naturally incorporated defining gravitational tension gravitational energy. notion sitter spacetime surrounding gravitational sourced cosmological spacetime gravitational tension encode spacetime volume. spacetime spacetime necessarily cosmological sourcing einstein equations. universal spacetime questioning significance. illustrate ideas studying kaluza klein holes spacetime saturn perturbative solutions. kerr newman sitter spacetime holes lifshitz
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non_dup
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42751296
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10.1007/JHEP09(2016)125
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We study instanton corrections to the vacuum expectation value (VEV) of 1/6
BPS Wilson loops in ABJM theory from the Fermi gas approach. We mainly consider
Wilson loops in the fundamental representation and winding Wilson loops, but we
also initiate the study of Wilson loops with two boundaries. We find that the
membrane instanton corrections to the Wilson loop VEV are determined by the
refined topological string in the Nekrasov-Shatashvili limit, and the pole
cancellation mechanism between membrane instantons and worldsheet instantons
works also in the Wilson loop VEVs as in the case of the partition functions.Comment: 40 pages, 12 figure
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Instanton Corrections of 1/6 BPS Wilson Loops in ABJM Theory
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instanton corrections of 1/6 bps wilson loops in abjm theory
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instanton expectation wilson loops abjm fermi approach. wilson loops winding wilson loops initiate wilson loops boundaries. instanton wilson refined topological nekrasov shatashvili pole cancellation instantons worldsheet instantons wilson vevs partition pages
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non_dup
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[] |
73351251
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10.1007/JHEP09(2016)126
|
We consider the simplest realization of leptogenesis with one heavy Majorana
neutrino species much lighter than the other ones. In this scenario, when the
temperature of the early universe is smaller than the lightest Majorana
neutrino mass, we compute at first order in the Standard Model couplings and,
for each coupling, at leading order in the termperature the CP asymmetry in the
decays of the lightest neutrino into leptons and anti-leptons. We perform the
calculation using a hierarchy of two effective field theories organized as
expansions in the inverse of the heavy-neutrino masses. In the ultimate
effective field theory, leading thermal corrections proportional to the Higgs
self coupling and the gauge couplings are encoded in one single operator of
dimension five, whereas corrections proportional to the top Yukawa coupling are
encoded in four operators of dimension seven, which we compute.Comment: 34 pages, 23 figure
|
CP asymmetry in heavy Majorana neutrino decays at finite temperature:
the hierarchical case
|
cp asymmetry in heavy majorana neutrino decays at finite temperature: the hierarchical case
|
simplest realization leptogenesis majorana lighter ones. universe lightest majorana couplings termperature asymmetry decays lightest leptons leptons. hierarchy organized expansions masses. ultimate couplings encoded yukawa encoded seven pages
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non_dup
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[] |
29560084
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10.1007/JHEP09(2016)127
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We construct a class of codimension-2 solutions in supergravity that realize
T-folds with arbitrary $O(2,2,\mathbb{Z})$ monodromy and we develop a geometric
point of view in which the monodromy is identified with a product of Dehn
twists of an auxiliary surface $\Sigma$ fibered on a base $\mathcal{B}$. These
defects, that we call T-fects, are identified by the monodromy of the mapping
torus obtained by fibering $\Sigma$ over the boundary of a small disk
encircling a degeneration. We determine all possible local geometries by
solving the corresponding Cauchy-Riemann equations, that imply the equations of
motion for a semi-flat metric ansatz. We discuss the relation with the
F-theoretic approach and we consider a generalization to the T-duality group of
the heterotic theory with a Wilson line.Comment: 60 pages, 12 figure
|
The monodromy of T-folds and T-fects
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the monodromy of t-folds and t-fects
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codimension supergravity realize folds mathbb monodromy geometric monodromy dehn twists auxiliary sigma fibered mathcal defects call fects monodromy torus fibering sigma encircling degeneration. geometries solving cauchy riemann imply ansatz. theoretic generalization duality heterotic wilson pages
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non_dup
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73347944
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10.1007/JHEP09(2016)128
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We compute entanglement entropy for free massive scalar fields in anti-de
Sitter (AdS) space. The entangling surface is a minimal surface whose boundary
is a sphere at the boundary of AdS. The entropy can be evaluated from the
thermal free energy of the fields on a topological black hole by using the
replica method. In odd-dimensional AdS, exact expressions of the Renyi entropy
$S_n$ are obtained for arbitrary $n$. We also evaluate 1-loop corrections
coming from the scalar fields to holographic entanglement entropy. Applying the
results, we compute the leading difference of entanglement entropy between two
holographic CFTs related by a renormalization group flow triggered by a double
trace deformation. The difference is proportional to the shift of a central
charge under the flow.Comment: v3: 25 pages, 2 figures, typos correcte
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Entanglement entropy for free scalar fields in AdS
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entanglement entropy for free scalar fields in ads
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entanglement massive sitter space. entangling sphere ads. topological replica method. expressions renyi coming holographic entanglement entropy. entanglement holographic cfts renormalization triggered trace deformation. pages typos correcte
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non_dup
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[] |
42721208
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10.1007/JHEP09(2016)130
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Bulk localized excited states in an AdS spacetime can be constructed from
Ishibashi states with respect to the global conformal symmetry in the dual CFT.
We study boundary two point functions of primary operators in the presence of
bulk localized excitations in two dimensional CFTs. From two point functions in
holographic CFTs, we observe causal propagations of radiations when the mass of
dual bulk scalar field is close to the BF bound. This behavior for holographic
CFTs is consistent with the locality and causality in classical gravity duals.
We also show that this cannot be seen in free fermion CFTs. Moreover, we find
that the short distance behavior of two point functions is universal and obeys
the relation which generalizes the first law of entanglement entropy.Comment: 23pages, Late
|
Causal Evolutions of Bulk Local Excitations from CFT
|
causal evolutions of bulk local excitations from cft
|
localized excited spacetime ishibashi conformal cft. localized excitations cfts. holographic cfts causal propagations radiations bound. holographic cfts locality causality duals. fermion cfts. universal obeys generalizes entanglement pages
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non_dup
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42733261
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10.1007/JHEP09(2016)132
|
A number of phenomenologically relevant processes at hadron colliders, such
as Higgs and Z boson production in association with b quarks, can be
conveniently described as scattering of heavy quarks in the initial state. We
present a detailed analysis of this class of processes, identifying the form of
the leading initial-state collinear logarithms that allow the relation of
calculations performed in different flavour schemes in a simple and reliable
way. This procedure makes it possible to assess the size of the logarithmically
enhanced terms and the effects of their resummation via heavy-quark parton
distribution functions. As an application, we compare the production of
(SM-like and heavy) scalar and vector bosons in association with b quarks at
the LHC in the four- and five-flavour schemes as well as the production of a
heavy Z' in association with top quarks at a future 100 TeV hadron collider in
the five- and six-flavour schemes. We find that, in agreement with a previous
analysis of single heavy-quark initiated processes, the size of the
initial-state logarithms is mitigated by a kinematical suppression. The most
important effects of the resummation are a shift of the central predictions
typically of about 20% at a justified value of the scale of each considered
process and a significant reduction of scale variation uncertainties.Comment: 27 pages, 12 figure
|
Anatomy of double heavy-quark initiated processes
|
anatomy of double heavy-quark initiated processes
|
phenomenologically hadron colliders boson quarks conveniently quarks state. identifying collinear logarithms flavour schemes reliable way. logarithmically resummation parton functions. bosons quarks flavour schemes quarks hadron collider flavour schemes. initiated logarithms mitigated kinematical suppression. resummation justified pages
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non_dup
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42735193
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10.1007/JHEP09(2016)133
|
The evaluation of generic Cachazo-He-Yuan(CHY)-integrands is a big challenge
and efficient computational methods are in demand for practical evaluation. In
this paper, we propose a systematic decomposition algorithm by using
cross-ratio identities, which provides an analytic and easy to implement method
for the evaluation of any CHY-integrand. This algorithm aims to decompose a
given CHY-integrand containing higher-order poles as a linear combination of
CHY-integrands with only simple poles in a finite number of steps, which
ultimately can be trivially evaluated by integration rules of simple poles. To
make the method even more efficient for CHY-integrands with large number of
particles and complicated higher-order pole structures, we combine the
$\Lambda$-algorithm and the cross-ratio identities, and as a by-product it
provides us a way to deal with CHY-integrands where the $\Lambda$-algorithm was
not applicable in its original formulation.Comment: 37 pages, 6 figures, v2 references update
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Cross-ratio Identities and Higher-order Poles of CHY-integrand
|
cross-ratio identities and higher-order poles of chy-integrand
|
generic cachazo yuan integrands challenge practical evaluation. propose decomposition identities analytic implement integrand. aims decompose integrand poles integrands poles ultimately trivially poles. integrands complicated pole combine lambda identities deal integrands lambda applicable pages update
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non_dup
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[] |
42720262
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10.1007/JHEP09(2016)134
|
This paper is a new step in the project of systematic description of colored
knot polynomials started in arXiv:1506.00339. In this paper, we managed to
explicitly find the inclusive Racah matrix, i.e. the whole set of mixing
matrices in channels R^3->Q with all possible Q, for R=[3,1]. The calculation
is made possible by the use of a newly-developed efficient highest-weight
method, still it remains tedious. The result allows one to evaluate and
investigate [3,1]-colored polynomials for arbitrary 3-strand knots, and this
confirms many previous conjectures on various factorizations, universality, and
differential expansions. We consider in some detail the next-to-twist-knots
three-strand family (n,-1|1,-1) and deduce its colored HOMFLY. Also confirmed
and clarified is the eigenvalue hypothesis for the Racah matrices, which
promises to provide a shortcut to generic formulas for arbitrary
representations.Comment: 21 page
|
HOMFLY polynomials in representation [3,1] for 3-strand braids
|
homfly polynomials in representation [3,1] for 3-strand braids
|
colored knot polynomials started managed explicitly inclusive racah i.e. newly tedious. colored polynomials strand knots confirms conjectures factorizations universality expansions. twist knots strand deduce colored homfly. confirmed clarified eigenvalue racah promises shortcut generic formulas
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non_dup
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[] |
42741464
|
10.1007/JHEP09(2016)135
|
Continuing the quest for exclusive Racah matrices, which are needed for
evaluation of colored arborescent-knot polynomials in Chern-Simons theory, we
suggest to extract them from a new kind of a double-evolution -- that of the
antiparallel double-braids, which is a simple two-parametric family of
two-bridge knots, generalizing the one-parametric family of twist knots. In the
case of rectangular representations $R=[r^s]$ we found an evidence that the
corresponding differential expansion miraculously factorizes and can be
obtained from that for the twist knots. This reduces the problem of rectangular
exclusive Racah to constructing the answers for just a few twist knots. We
develop a recent conjecture on the structure of differential expansion for the
simplest members of this family (the trefoil and the figure-eight knot) and
provide the exhaustive answer for the first unknown case of $R=[33]$. The
answer includes HOMFLY of arbitrary twist and double-braid knots and Racah
matrices $\bar S$ and $S$ -- what allows to calculate $[33]$-colored
polynomials for arbitrary arborescent (double-fat) knots. For generic
rectangular representations described in detail are only the contributions of
the single- and two-floor pyramids, the way to proceed is explicitly
illustrated by the examples of $R=[44]$ and $R=[55]$. This solves the difficult
part of the problem, but the last tedious step towards explicit formulas for
generic exclusive rectangular Racah matrices still remains to be made.Comment: 32 page
|
Factorization of differential expansion for antiparallel double-braid
knots
|
factorization of differential expansion for antiparallel double-braid knots
|
continuing quest exclusive racah colored arborescent knot polynomials chern simons extract kind antiparallel braids parametric bridge knots generalizing parametric twist knots. rectangular representations miraculously factorizes twist knots. reduces rectangular exclusive racah constructing answers twist knots. conjecture simplest trefoil eight knot exhaustive answer unknown answer homfly twist braid knots racah colored polynomials arborescent knots. generic rectangular representations floor pyramids proceed explicitly illustrated solves tedious formulas generic exclusive rectangular racah
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non_dup
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[] |
73347783
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10.1007/JHEP09(2016)137
|
We explore some aspects of three-dimensional higher-spin holography by
studying scalar fluctuations in the background of higher-spin black holes. We
furnish an independent derivation of the bulk-boundary propagator by purely
invoking a well-known infinite dimensional matrix representation of
$hs[\lambda]$ algebra related to its construction as a quotient of the
universal enveloping algebra of $sl(2)$, thus evading the need in previous
literature to perform an analytic continuation from some integer to $\lambda$.
The propagator and the boundary two-point functions are derived for black hole
solutions in $hs[\lambda]\times hs[\lambda]$ Chern-Simons theory with spin-3
and spin-4 charges up to second-order in the potentials. We match them with
three- and four-point torus correlation functions of the putative dual
conformal field theory which has $\mathcal{W}_\infty [\lambda]$ symmetry and is
deformed by higher-spin currents.Comment: 27 pages. v3: references adde
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On scalar propagators of three-dimensional higher-spin black holes
|
on scalar propagators of three-dimensional higher-spin black holes
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explore holography studying holes. furnish derivation propagator purely invoking infinite lambda quotient universal enveloping evading analytic continuation integer lambda propagator lambda lambda chern simons charges potentials. match torus putative conformal mathcal infty lambda deformed pages. adde
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non_dup
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[] |
42731766
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10.1007/JHEP09(2016)139
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The replica trick defines Renyi entropies as partition functions on conically
singular geometries. We discuss their gravity duals: regular bulk solutions to
the Einstein equations inducing conically singular metrics at the boundary.
When the conical singularity is supported on a flat or spherical surface, these
solutions are rewritings of the hyperbolic black hole. For more general shapes,
these solutions are new. We construct them perturbatively in a double expansion
in the distance and strength of the conical singularity, and extract the vacuum
polarisation due to the cone. Recent results about the structure of logarithmic
divergences of Renyi entropies are reproduced ---in particular, $f_b\neq f_c$.
We discuss in detail the dynamical resolution of the singularity in the bulk.
This resolution is in agreement with a previous proposal, and indicates a
non-minimal settling to the `splitting problem': an apparent ambiguity in the
holographic entropy formula of certain theories with higher derivatives.Comment: v3: 31 pages. Typos corrected and some clarifications. Matches
publishe
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Gravity duals of boundary cones
|
gravity duals of boundary cones
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replica trick defines renyi entropies partition conically singular geometries. duals einstein inducing conically singular metrics boundary. conical singularity spherical rewritings hyperbolic hole. shapes new. perturbatively conical singularity extract polarisation cone. logarithmic divergences renyi entropies reproduced singularity bulk. proposal settling splitting apparent ambiguity holographic pages. typos corrected clarifications. matches publishe
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non_dup
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[] |
29511404
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10.1007/JHEP09(2016)140
|
Recent astronomical observations show that the universe may be anisotropic on
large scales. The Union2 SnIa data hint that the universe has a preferred
direction. If such a cosmological privileged axis indeed exists, one has to
consider an anisotropic expanding Universe instead of the isotropic
cosmological model. In this paper, we present a detailed analysis of the dark
energy dipole in $f(R,T)=f_{1}(R)+f_{2}(T)$ Cosmological Model using three
types of dipole fit (DF) method which are (I)dipole + monopole fitting for
distance modulus(DMFDM), (II)dipole + monopole fitting for luminosity
distance(DMFLD) and (III) general dipole fitting for luminosity
distance(GDFLD). We have found the maximum anisotropic deviation direction for
(DMFDM) method as $(l, b)=(315^{+25}_{-25},-23^{+14}_{-15})$, for (DMFLD) as
$(l, b)=(l, b)=(315^{+35}_{-37},-23^{+18}_{-18})$, and for (GDFLD) method as
$(l, b)=(317^{+32}_{-32},-23^{+18}_{-18})$ which are located very close to each
other. We compare our model with the $CPL$, $\Lambda CDM$ and $\omega CDM$
models. Constraints on $(l, b)$ in $f(R, T)$ model are not much different from
the cases of the $CPL$, $\Lambda CDM$ and $\omega CDM$ models. Moreover, the
results are consistent with other studies.Comment: 40 page 25 fig. arXiv admin note. arXiv admin note: text overlap with
arXiv:1303.0961, arXiv:1302.1866, arXiv:1411.1466, arXiv:1107.5807,
arXiv:1306.3164 by other author
|
Searching for a Cosmological Preferred Axis in complicated class of
cosmological models:Case study $f(R,T)$ model
|
searching for a cosmological preferred axis in complicated class of cosmological models:case study $f(r,t)$ model
|
astronomical universe anisotropic scales. union snia hint universe preferred direction. cosmological privileged anisotropic expanding universe isotropic cosmological model. dipole cosmological dipole dipole monopole fitting modulus dmfdm dipole monopole fitting luminosity dmfld dipole fitting luminosity gdfld anisotropic dmfdm dmfld gdfld other. lambda omega models. lambda omega models. fig. admin note. admin overlap
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non_dup
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[] |
73356073
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10.1007/JHEP09(2016)141
|
In four dimensions, partially massless fields of all spins and depths possess
a duality invariance akin to electric-magnetic duality. We construct
metric-like gauge invariant curvature tensors for partially massless fields of
all integer spins and depths, and show how the partially massless equations of
motion can be recovered from first order field equations and Bianchi identities
for these curvatures. This formulation displays duality in its manifestly local
and covariant form, in which it acts to interchange the field equations and
Bianchi identities.Comment: 46 pages, 1 figur
|
Manifest Duality for Partially Massless Higher Spins
|
manifest duality for partially massless higher spins
|
partially massless spins depths possess duality invariance akin duality. curvature tensors partially massless integer spins depths partially massless recovered bianchi identities curvatures. formulation displays duality manifestly covariant acts interchange bianchi pages figur
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non_dup
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[] |
42675274
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10.1007/JHEP09(2016)142
|
Using black brane solutions in 5d Lifshitz-like backgrounds with arbitrary
dynamical exponent $\nu$, we construct the Vaidya geometry, asymptoting to the
Lifshitz-like spacetime, which represents a thin shell infalling at the speed
of light. We apply the new Lifshitz-Vaidya background to study the
thermalization process of the quark-gluon plasma via the thin shell approach
previously successfully used in several backgrounds. We find that the
thermalization depends on the chosen direction because of the spatial
anisotropy. The plasma thermalizes thus faster in the transversal direction
than in the longitudinal one. To probe the system described by the
Lifshitz-like backgrounds, we also calculate the holographic entanglement
entropy for the subsystems delineated along both transversal and longitudinal
directions. We show that the entropy has some universality in the behavior for
both subsystems. At the same time, we find that certain characteristics
strongly depend on the critical exponent $\nu$.Comment: 39 pages, 23 figures; v3: typos corrected, references and
clarifications added, version published in JHE
|
Analytic black branes in Lifshitz-like backgrounds and thermalization
|
analytic black branes in lifshitz-like backgrounds and thermalization
|
brane lifshitz backgrounds exponent vaidya asymptoting lifshitz spacetime infalling light. lifshitz vaidya thermalization gluon successfully backgrounds. thermalization anisotropy. thermalizes faster transversal longitudinal one. lifshitz backgrounds holographic entanglement subsystems delineated transversal longitudinal directions. universality subsystems. exponent .comment pages typos corrected clarifications
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non_dup
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42724897
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10.1007/JHEP09(2016)143
|
The 2-Higgs-Doublet Model (2HDM) belongs to the simplest extensions of the
Standard Model (SM) Higgs sector that are in accordance with theoretical and
experimental constraints. In order to be able to properly investigate the
experimental Higgs data and, in the long term to distinguish between possible
models beyond the SM, precise predictions for the Higgs boson observables have
to be made available on the theory side. This requires the inclusion of the
higher order corrections. In this work, we investigate in detail the
renormalization of the 2HDM, a pre-requisite for the computation of higher
order corrections. We pay particular attention to the renormalization of the
mixing angles $\alpha$ and $\beta$, which diagonalize the Higgs mass matrices
and which enter all Higgs observables. The implications of various
renormalization schemes in next-to-leading order corrections to the sample
processes $H^\pm \to W^\pm h/H$ and $H \to ZZ$ are investigated. Based on our
findings, we will present a renormalization scheme that is at the same time
process independent, gauge independent and numerically stable
|
Gauge-independent Renormalization of the 2-Higgs-Doublet Model
|
gauge-independent renormalization of the 2-higgs-doublet model
|
doublet belongs simplest extensions accordance constraints. properly distinguish precise boson observables side. inclusion corrections. renormalization requisite corrections. renormalization angles alpha beta diagonalize enter observables. renormalization schemes investigated. renormalization numerically
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non_dup
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[] |
42737254
|
10.1007/JHEP09(2016)144
|
In this paper, we show that a higher derivative theory, such as New Massive
Gravity, allows the existence of new entangling surfaces with non-zero
extrinsic curvature. We perform the analysis for Lifshitz and Warped $AdS$
space times, revealing the role of the higher derivative contributions in the
calculation of the holographic entanglement entropy. Finally, as an outcome of
our holographic analysis we briefly comment on the dual boundary theory.Comment: 23 pages, 1 figure. v3: published versio
|
Holographic Entanglement Entropy in NMG
|
holographic entanglement entropy in nmg
|
massive entangling extrinsic curvature. lifshitz warped revealing holographic entanglement entropy. holographic briefly comment pages figure. versio
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non_dup
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[] |
42750541
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10.1007/JHEP09(2016)145
|
We consider a truncation of type IIB supergravity on four-torus where in
addition to the Ramond-Ramond 2-form field, the Ramond-Ramond axion (w) and the
NS-NS 2-form field (B) are also retained. In the (w, B) sector we construct a
linearised perturbation carrying only left moving momentum on two-charge
non-extremal D1-D5 geometries of Jejjala, Madden, Ross and Titchener. The
perturbation is found to be smooth everywhere and normalizable. It is
constructed by matching to leading order solutions of the perturbation
equations in the inner and outer regions of the geometry.Comment: 24 pages, no figures; v2: footnotes added; v3: JHEP version; v4:
results unchanged, app B removed, a footnote added, supersedes published
versio
|
Hair on non-extremal D1-D5 bound states
|
hair on non-extremal d1-d5 bound states
|
truncation supergravity torus ramond ramond ramond ramond axion retained. linearised perturbation carrying moving extremal geometries jejjala madden ross titchener. perturbation everywhere normalizable. matching perturbation outer pages footnotes jhep unchanged removed footnote supersedes versio
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non_dup
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[] |
42663274
|
10.1007/JHEP09(2016)146
|
The assumption of anarchic quark flavor puts serious stress on composite
Higgs models: flavor bounds imply a tuning of a few per-mille (at best) in the
Higgs potential. Composite twin Higgs (CTH) models significantly reduce this
tension by opening up a new region of parameter space, obtained by raising the
coupling among the composites close to the strong coupling limit $g_* \sim
4\pi$, thereby raising the scale of composites to around 10 TeV. This does not
lead to large tuning in the Higgs potential since the leading quantum
corrections are canceled by the twin partners (rather than the composites). We
survey the leading flavor bounds on the CTH, which correspond to tree-level
$\Delta F=2$ four-Fermi operators from Kaluza-Klein (KK) Z exchange in the kaon
system and 1-loop corrections from KK fermions to the electric dipole moment of
the neutron. We provide a parametric estimate for these bounds and also perform
a numeric scan of the parameter space using the complete calculation for both
quantities. The results confirm our expectation that CTH models accommodate
anarchic flavor significantly better than regular composite Higgs (CH) models.
Our conclusions apply both to the identical and fraternal twin cases.Comment: 35 pages, 9 figure
|
The Flavor of the Composite Twin Higgs
|
the flavor of the composite twin higgs
|
anarchic flavor puts serious composite flavor bounds imply tuning mille potential. composite twin tension opening raising composites thereby raising composites tev. tuning canceled twin partners composites flavor bounds delta fermi kaluza klein kaon fermions dipole moment neutron. parametric bounds numeric scan quantities. confirm expectation accommodate anarchic flavor composite models. fraternal twin pages
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non_dup
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[] |
73355724
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10.1007/JHEP09(2016)147
|
The observation of neutrino masses, mixing and the existence of dark matter
are amongst the most important signatures of physics beyond the Standard Model
(SM). In this paper, we propose to extend the SM by a local $L_\mu - L_\tau$
gauge symmetry, two additional complex scalars and three right-handed
neutrinos. The $L_\mu - L_\tau$ gauge symmetry is broken spontaneously when one
of the scalars acquires a vacuum expectation value. The $L_\mu - L_\tau$ gauge
symmetry is known to be anomaly free and can explain the beyond SM measurement
of the anomalous muon $({\rm g-2})$ through additional contribution arising
from the extra $Z_{\mu\tau}$ mediated diagram. Small neutrino masses are
explained naturally through the Type-I seesaw mechanism, while the mixing
angles are predicted to be in their observed ranges due to the broken
$L_\mu-L_\tau$ symmetry. The second complex scalar is shown to be stable and
becomes the dark matter candidate in our model. We show that while the
$Z_{\mu\tau}$ portal is ineffective for the parameters needed to explain the
anomalous muon $({\rm g-2})$ data, the correct dark matter relic abundance can
easily be obtained from annihilation through the Higgs portal. Annihilation of
the scalar dark matter in our model can also explain the Galactic Centre gamma
ray excess observed by Fermi-LAT. We show the predictions of our model for
future direct detection experiments and neutrino oscillation experiments.Comment: 33 pages, 12 figures, 3 Tables, Version accepted for publication in
JHE
|
Neutrino Mass, Dark Matter and Anomalous Magnetic Moment of Muon in a
$U(1)_{L_{\mu}-L_{\tau}}$ Model
|
neutrino mass, dark matter and anomalous magnetic moment of muon in a $u(1)_{l_{\mu}-l_{\tau}}$ model
|
amongst signatures propose extend scalars handed neutrinos. broken spontaneously scalars acquires expectation value. anomaly anomalous muon arising extra diagram. naturally seesaw angles ranges broken symmetry. candidate model. portal ineffective anomalous muon relic abundance annihilation portal. annihilation galactic gamma excess fermi lat. oscillation pages tables publication
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non_dup
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[] |
42739831
|
10.1007/JHEP09(2016)148
|
We consider Abelian tensor hierarchy in four-dimensional ${\cal N}=1$
supergravity in the conformal superspace formalism, where the so-called
covariant approach is used to antisymmetric tensor fields. We introduce
$p$-form gauge superfields as superforms in the conformal superspace. We solve
the Bianchi identities under the constraints for the superforms. As a result,
each of form fields is expressed by a single gauge invariant superfield. The
action of superforms is shown with the invariant superfields. We also show the
relation between the superspace formalism and the superconformal tensor
calculus.Comment: 31 page
|
Abelian tensor hierarchy in 4D ${\cal N}=1$ conformal supergravity
|
abelian tensor hierarchy in 4d ${\cal n}=1$ conformal supergravity
|
abelian hierarchy supergravity conformal superspace formalism covariant antisymmetric fields. superfields superforms conformal superspace. solve bianchi identities superforms. superfield. superforms superfields. superspace formalism superconformal
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non_dup
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42686707
|
10.1007/JHEP09(2016)149
|
We explore a new class of natural models which ensure the one-loop
divergences in the Higgs mass are cancelled. The top-partners that cancel the
top loop are new gauge bosons, and the symmetry relation that ensures the
cancellation arises at an infrared fixed point. Such a cancellation mechanism
can, a la Little Higgs models, push the scale of new physics that completely
solves the hierarchy problem up to 5-10 TeV. When embedded in a supersymmetric
model, the stop and gaugino masses provide the cutoffs for the loops, and the
mechanism ensures a cancellation between the stop and gaugino mass dependence
of the Higgs mass parameter.Comment: 15 pages, 3 figure
|
Little Conformal Symmetry
|
little conformal symmetry
|
explore ensure divergences cancelled. partners cancel bosons ensures cancellation arises infrared point. cancellation push solves hierarchy tev. embedded supersymmetric stop gaugino cutoffs loops ensures cancellation stop gaugino pages
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non_dup
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42682291
|
10.1007/JHEP09(2016)150
|
We present a supersymmetric version of a two-field relaxion model that
naturalizes tuned versions of supersymmetry. This arises from a relaxion
mechanism that does not depend on QCD dynamics and where the relaxion potential
barrier height is controlled by a second axion-like field. During the
cosmological evolution, the relaxion rolls with a nonzero value that breaks
supersymmetry and scans the soft supersymmetric mass terms. Electroweak
symmetry is broken after the soft masses become of order the supersymmetric
Higgs mass term and causes the relaxion to stop rolling for superpartner masses
up to $\sim 10^9$ GeV. This can explain the tuning in supersymmetric models,
including split-SUSY models, while preserving the QCD axion solution to the
strong CP problem. Besides predicting two very weakly-coupled axion-like
particles, the supersymmetric spectrum may contain an extra Goldstino, which
could be a viable dark matter candidate.Comment: 33 pages, 3 figures; v2: bounds and figures correcte
|
Naturalizing Supersymmetry with a Two-Field Relaxion Mechanism
|
naturalizing supersymmetry with a two-field relaxion mechanism
|
supersymmetric relaxion naturalizes tuned versions supersymmetry. arises relaxion relaxion barrier axion field. cosmological relaxion rolls nonzero breaks supersymmetry scans supersymmetric terms. electroweak broken supersymmetric relaxion stop rolling superpartner gev. tuning supersymmetric split susy preserving axion problem. besides predicting weakly axion supersymmetric extra goldstino viable pages bounds correcte
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non_dup
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[] |
42704356
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10.1007/JHEP09(2016)154
|
Recently, two groups have made distinct proposals for a de Sitter space that
is emergent from conformal field theory (CFT). The first proposal is that, for
two-dimensional holographic CFTs, the kinematic space of geodesics on a
spacelike slice of the asymptotically anti-de Sitter bulk is two-dimensional de
Sitter space (dS$_2$), with a metric that can be derived from the entanglement
entropy of intervals in the CFT. In the second proposal, de Sitter dynamics
emerges naturally from the first law of entanglement entropy for perturbations
around the vacuum state of CFTs. We provide support for the equivalence of
these two emergent spacetimes in the vacuum case and beyond. In particular, we
study the kinematic spaces of nontrivial solutions of $3$d gravity, including
the BTZ black string, BTZ black hole, and conical singularities. We argue that
the resulting spaces are generically globally hyperbolic spacetimes that
support dynamics given boundary conditions at future infinity. For the BTZ
black string, corresponding to a thermal state of the CFT, we show that both
prescriptions lead to an emergent hyperbolic patch of dS$_2$. We offer a
general method for relating kinematic space and the auxiliary de Sitter space
that is valid in the vacuum and thermal cases.Comment: 46 pages, 20 figures; v2: typos fixed, minor clarifications, added
analysis of entanglement entropy phase transitions in Sections 2.4, 2.5 and
|
Equivalence of Emergent de Sitter Spaces from Conformal Field Theory
|
equivalence of emergent de sitter spaces from conformal field theory
|
proposals sitter emergent conformal proposal holographic cfts kinematic geodesics spacelike slice asymptotically sitter sitter entanglement intervals cft. proposal sitter emerges naturally entanglement perturbations cfts. equivalence emergent spacetimes beyond. kinematic nontrivial conical singularities. argue generically globally hyperbolic spacetimes infinity. prescriptions emergent hyperbolic patch offer relating kinematic auxiliary sitter valid pages typos minor clarifications entanglement
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non_dup
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42679153
|
10.1007/JHEP09(2016)155
|
In this letter, we provide evidence for universality in the low-energy
expansion of tree-level string interactions. More precisely, in the
alpha'-expansion of tree-level scattering amplitudes, we conjecture that the
leading transcendental coefficient at each order in alpha' is universal for all
perturbative string theories. We have checked this universality up to seven
points and trace its origin to the ability to restructure the disk integrals of
open bosonic string into those of the superstring. The accompanying kinematic
functions have the same low-energy limit and do not introduce any
transcendental numbers in their alpha'-corrections. Universality in the
closed-string sector then follows from the KLT-relations.Comment: 5 pages, Mathematica notebook on the five-point open-string amplitude
included in submissio
|
Universality in string interactions
|
universality in string interactions
|
letter universality interactions. precisely alpha amplitudes conjecture transcendental alpha universal perturbative theories. checked universality seven trace restructure integrals bosonic superstring. accompanying kinematic transcendental alpha corrections. universality pages mathematica notebook submissio
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non_dup
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[] |
42747266
|
10.1007/JHEP09(2016)156
|
We present a systematic procedure to obtain the one-loop low-energy effective
Lagrangian resulting from integrating out the heavy fields of a given
ultraviolet theory. We show that the matching coefficients are determined
entirely by the hard region of the functional determinant involving the heavy
fields. This represents an important simplification with respect the
conventional matching approach, where the full and effective theory
contributions have to be computed separately and a cancellation of the infrared
divergent parts has to take place. We illustrate the method with a descriptive
toy model and with an extension of the Standard Model with a heavy real scalar
triplet. A comparison with other schemes that have been put forward recently is
also provided.Comment: 24 pages. Uses feynMF packag
|
Integrating out heavy particles with functional methods: a simplified
framework
|
integrating out heavy particles with functional methods: a simplified framework
|
lagrangian integrating ultraviolet theory. matching entirely determinant involving fields. simplification matching separately cancellation infrared divergent place. illustrate descriptive triplet. schemes pages. feynmf packag
|
non_dup
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[] |
42742144
|
10.1007/JHEP09(2016)157
|
We calculate the double pole contribution to two to four fermion scattering
through $W^{\pm}$ currents at tree level in the Standard Model Effective Field
Theory (SMEFT). We assume all fermions to be massless, $\rm U(3)^5$ flavour and
$\rm CP$ symmetry. Using this result, we update the global constraint picture
on SMEFT parameters including LEPII data on these charged current processes,
and also include modifications to our fit procedure motivated by a companion
paper focused on $W^{\pm}$ mass extractions. The fit reported is now to 177
observables and emphasises the need for a consistent inclusion of theoretical
errors, and a consistent treatment of observables. Including charged current
data lifts the two-fold degeneracy previously encountered in LEP (and lower
energy) data, and allows us to set simultaneous constraints on 20 of 53 Wilson
coefficients in the SMEFT, consistent with our assumptions. This allows the
model independent inclusion of LEP data in SMEFT studies at LHC, which are
projected into the SMEFT in a consistent fashion. We show how stronger
constraints can be obtained by using some combinations of Wilson coefficients,
when making assumptions on the UV completion of the Standard Model, or in an
inconsistent analysis. We explain why strong bounds at the per-mille or
sub-per-mille level on some combinations of Wilson coefficients in the
Effective Lagrangian can be artificially enhanced in fits of this form in
detail. This explains some of the different claims present in the literature.Comment: 27 pages + appendix, 9 fig, Acknowledgement updated with grant
number
|
Incorporating doubly resonant $W^\pm$ data in a global fit of SMEFT
parameters to lift flat directions
|
incorporating doubly resonant $w^\pm$ data in a global fit of smeft parameters to lift flat directions
|
pole fermion currents smeft fermions massless flavour symmetry. update picture smeft lepii modifications motivated companion focused extractions. observables emphasises inclusion observables. lifts degeneracy encountered simultaneous wilson smeft assumptions. inclusion smeft projected smeft fashion. stronger combinations wilson assumptions completion inconsistent analysis. bounds mille mille combinations wilson lagrangian artificially fits detail. explains claims pages acknowledgement updated
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non_dup
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[] |
42748250
|
10.1007/JHEP09(2016)158
|
We consider scenarios of Higgs compositeness where the Higgs doublet arises
as a pseudo-Nambu Goldstone boson. Our focus is the physical scalar ("radial")
excitation associated with the global symmetry breaking vacuum, which we call
the "global Higgs". For the minimal case of a $SO(5)/SO(4)$ coset, the
couplings of the global Higgs to Standard Model (SM) particles are fully
determined by group theoretical factors and two decay constants. The global
Higgs also couples to the composite resonances of the theory, inducing an
interaction with the SM gauge bosons at one-loop. We thoroughly analyze
representative fermionic sectors, considering a global Higgs both in the $\bf
5$ and $\bf 14$ representations of $SO(5)$ and taking into account the
renormalization group evolution of couplings in the composite sector. We derive
the one-loop effective couplings and all decays of the global Higgs, showing
that its decay width over mass can range from $ O (10^{-3})$ to $ O(1)$.
Because of the multiplicity of the resonances, the coupling of the global Higgs
to gluons is sizeable, potentially opening a new window into composite models
at the LHC.Comment: 27 pages, 2 figures. v3: References and comments added. Matches JHEP
versio
|
The Excitation of the Global Symmetry-Breaking Vacuum in Composite Higgs
Models
|
the excitation of the global symmetry-breaking vacuum in composite higgs models
|
scenarios compositeness doublet arises pseudo nambu goldstone boson. breaking call coset couplings constants. couples composite resonances inducing bosons loop. thoroughly analyze fermionic sectors representations renormalization couplings composite sector. derive couplings decays multiplicity resonances gluons sizeable potentially opening window composite pages figures. comments added. matches jhep versio
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non_dup
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[] |
42738445
|
10.1007/JHEP09(2016)159
|
Applying the dispersion approach we compute perturbative QCD corrections to
the power suppressed soft contribution of $B \to \gamma \ell \nu$ at leading
twist. QCD factorization for the $B \to \gamma^{\ast}$ form factors is
demonstrated explicitly for the hard-collinear transverse polarized photon at
one loop, with the aid of the method of regions. While the one-loop hard
function is identical to the matching coefficient of the QCD weak current $\bar
u \, \gamma_{\mu \perp} \, (1- \gamma_5) \, b$ in soft-collinear effective
theory, the jet function from integrating out the hard-collinear fluctuations
differs from the corresponding one entering the factorization formula of $B \to
\gamma \ell \nu$. Furthermore, we evaluate the sub-leading power contribution
to the $B \to \gamma$ form factors from the three-particle $B$-meson
distribution amplitudes (DAs) at tree level. The soft contribution to the $B
\to \gamma$ form factors from the three-particle $B$-meson DAs is shown to be
of the same power compared with the corresponding hard correction, in contrast
to the two-particle counterparts. Numerically the next-to-leading-order QCD
correction to the soft two-particle contribution in $B \to \gamma$ form factors
will induce an approximately $\left (10 \sim 20 \right) \%$ shift to the
tree-level contribution at $\lambda_B(\mu_0)=354 \, {\rm MeV}$. Albeit of power
suppression parametrically, the soft two-particle correction can decrease the
leading power predictions for the $B \to \gamma$ form factors by an amount of
$\left (10 \sim 30 \right) \%$ with the same value of $\lambda_B(\mu_0)$.
Employing the phenomenological model of the three-particle $B$-meson DAs
inspired by a QCD sum rule analysis, the three-particle contribution to the $B
\to \gamma$ form factors is predicted to be of ${\cal O} (1 \%)$, at leading
order in $\alpha_s$, with the default theory inputs.Comment: 32 pages, 9 figure
|
Factorization and dispersion relations for radiative leptonic $B$ decay
|
factorization and dispersion relations for radiative leptonic $b$ decay
|
perturbative suppressed gamma twist. factorization gamma explicitly collinear polarized regions. matching gamma perp gamma collinear integrating collinear differs entering factorization gamma gamma meson amplitudes level. gamma meson counterparts. numerically gamma induce lambda albeit suppression parametrically gamma lambda employing phenomenological meson inspired gamma alpha default pages
|
non_dup
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[] |
73349270
|
10.1007/JHEP09(2016)160
|
In this article we extend the effective field theory framework describing new
physics effects to the case where the underlying low-energy theory is a
Two-Higgs-Doublet model. We derive a complete set of independent operators up
to dimension six assuming a $Z_2$-invariant CP-conserving Higgs potential. The
effects on Higgs and gauge boson masses, mixing angles in the Higgs sector as
well as couplings to fermions and gauge bosons are computed. At variance with
the case of a single Higgs doublet, we find that pair production of SM-like
Higgses, arising through dimension-six operators, is not fixed by
fermion-fermion-Higgs couplings and can therefore be sizable.Comment: 19 pages, 8 table
|
Effective Field Theory with Two Higgs Doublets
|
effective field theory with two higgs doublets
|
extend describing doublet model. derive conserving potential. boson angles couplings fermions bosons computed. doublet higgses arising fermion fermion couplings pages
|
non_dup
|
[] |
42743783
|
10.1007/JHEP09(2016)161
|
Recently a Complexity-Action (CA) duality conjecture has been proposed, which
relates the quantum complexity of a holographic boundary state to the action of
a Wheeler-DeWitt (WDW) patch in the anti-de Sitter (AdS) bulk. In this paper we
further investigate the duality conjecture for stationary AdS black holes and
derive some exact results for the growth rate of action within the
Wheeler-DeWitt (WDW) patch at late time approximation, which is supposed to be
dual to the growth rate of quantum complexity of holographic state. Based on
the results from the general $D$-dimensional Reissner-Nordstr\"{o}m (RN)-AdS
black hole, rotating/charged Ba\~{n}ados-Teitelboim-Zanelli (BTZ) black hole,
Kerr-AdS black hole and charged Gauss-Bonnet-AdS black hole, we present a
universal formula for the action growth expressed in terms of some
thermodynamical quantities associated with the outer and inner horizons of the
AdS black holes. And we leave the conjecture unchanged that the stationary AdS
black hole in Einstein gravity is the fastest computer in nature.Comment: v1, 10 pages, 2 figures, two columns; v2, 20 pages, 2 figures, JHEP
style, references added; v3, 23 pages, 2 figures, discussions extended and
references added, to be published in JHEP with title "Action Growth for AdS
Black Holes
|
Complexity Growth for AdS Black Holes
|
complexity growth for ads black holes
|
duality conjecture relates holographic wheeler dewitt patch sitter bulk. duality conjecture stationary holes derive wheeler dewitt patch supposed holographic state. reissner nordstr rotating ados teitelboim zanelli kerr gauss bonnet universal thermodynamical quantities outer horizons holes. leave conjecture unchanged stationary einstein fastest pages columns pages jhep style pages discussions jhep title holes
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non_dup
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[] |
29547609
|
10.1007/JHEP09(2016)162
|
We consider a model in which dark matter is a composite baryon of a dark
sector governed by $SU(3)$ gauge theory, with vector-like quarks also charged
under $U(1)_Y$. The model provides simple answer to the dark matter stability
problem: it is a result of the accidental dark baryon number conservation. And
with an analogy to QCD, all physical quantities of the dark matter can be
calculated by rescaling the QCD experimental results. According to the thermal
freeze-out mechanism the mass of the dark matter is predicted to be
$\mathcal{O}(100)$~TeV in order to achieve a correct relic abundance. Such
heavy dark matter is in general hard for detection due to small dark matter
number density in the universe. However, dark baryon number in our model is not
necessarily strictly preserved thanks to operators suppressed by the Planck
scale, and such decay operator results in a decay lifetime marginal to the
current detection bound. We show our model with $\mathcal{O}(10^{27})~s$ dark
matter decay life time can explain the AMS-02 anti-proton data, if it is
experimentally interpreted as an access, although some theoretical uncertainty
may weaken its significance. We also investigate other phenomena of this model
such as the extragalactic gamma ray and neutrino signatures.Comment: 14 pages, 43 figures, published in JHE
|
A scenario of heavy but visible baryonic dark matter
|
a scenario of heavy but visible baryonic dark matter
|
composite baryon governed quarks answer accidental baryon conservation. analogy quantities rescaling results. freeze mathcal relic abundance. universe. baryon necessarily strictly preserved thanks suppressed planck lifetime marginal bound. mathcal proton experimentally interpreted weaken significance. phenomena extragalactic gamma pages
|
non_dup
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[] |
73367430
|
10.1007/JHEP09(2016)163
|
In this note we first review the degenerate vacua arising from the BMS
symmetries. According to the discussion in [1] one can define BMS-analogous
supertranslation and superrotation for spacetime with black hole in Gaussian
null coordinates. In the leading and subleading orders of near horizon
approximation, the infinitely degenerate black hole solutions are derived by
considering Einstein equations with or without cosmological constant, and they
are related to each other by the diffeomorphism generated by horizon
supertranslation. Higher order results and degenerate Rindler horizon solutions
also are given in appendices.Comment: 21 pages,no figures, references added, match the version published in
JHE
|
Horizon supertranslation and degenerate black hole solutions
|
horizon supertranslation and degenerate black hole solutions
|
degenerate vacua arising symmetries. analogous supertranslation superrotation spacetime coordinates. subleading orders horizon infinitely degenerate einstein cosmological diffeomorphism horizon supertranslation. degenerate rindler horizon pages match
|
non_dup
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[] |
42729546
|
10.1007/JHEP09(2016)166
|
The open string metric arises kinematically in studying fluctuations of open
string degrees of freedom on a D-brane. An observer, living on a probe D-brane,
can send signals through the spacetime by using such fluctuations on the probe,
that propagate in accordance with a metric which is conformal to the open
string metric. Event horizons can emerge in the open string metric when one
considers a D-brane with an electric field on its worldvolume. Here, we
emphasize the role of and investigate, in details, the causal structure of the
resulting open string event horizon and demonstrate, among other things, its
close similarities to an usual black hole event horizon in asymptotically
AdS-spaces. To that end, we analyze relevant geodesics, Penrose diagrams and
various causal holographic observables for a given open string metric. For
analytical control, most of our calculations are performed in an asymptotically
AdS$_3$-background, however, we argue that the physics is qualitatively the
same in higher dimensions. We also discuss how this open string metric arises
from an underlying D-brane configuration in string theory.Comment: 42 pages, multiple figure
|
Emergent Horizons and Causal Structures in Holography
|
emergent horizons and causal structures in holography
|
arises kinematically studying freedom brane. observer living brane send spacetime propagate accordance conformal metric. horizons emerge considers brane worldvolume. emphasize causal horizon things similarities usual horizon asymptotically spaces. analyze geodesics penrose diagrams causal holographic observables metric. asymptotically argue qualitatively dimensions. arises brane pages
|
non_dup
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