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42655565
|
10.1007/JHEP07(2016)069
|
Building on the notion of a particle physics detector as a camera and the
collimated streams of high energy particles, or jets, it measures as an image,
we investigate the potential of machine learning techniques based on deep
learning architectures to identify highly boosted W bosons. Modern deep
learning algorithms trained on jet images can out-perform standard
physically-motivated feature driven approaches to jet tagging. We develop
techniques for visualizing how these features are learned by the network and
what additional information is used to improve performance. This interplay
between physically-motivated feature driven tools and supervised learning
algorithms is general and can be used to significantly increase the sensitivity
to discover new particles and new forces, and gain a deeper understanding of
the physics within jets.Comment: 32 pages, 24 figures. Version that is published in JHE
|
Jet-Images -- Deep Learning Edition
|
jet-images -- deep learning edition
|
notion camera collimated streams jets machine architectures boosted bosons. modern trained physically motivated tagging. visualizing learned performance. interplay physically motivated supervised discover forces deeper pages figures.
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non_dup
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[] |
42723210
|
10.1007/JHEP07(2016)070
|
Classical string actions in AdS(3) and dS(3) can be connected to the
sinh-Gordon and cosh-Gordon equations through Pohlmeyer reduction. We show that
the problem of constructing a classical string solution with a given static or
translationally invariant Pohlmeyer counterpart is equivalent to solving four
pairs of effective Schrodinger problems. Each pair consists of a flat potential
and an n = 1 Lame potential whose eigenvalues are connected, and, additionally,
the four solutions satisfy a set of constraints. An approach for solving this
system is developed by employing an interesting connection between the specific
class of classical string solutions and the band structure of the Lame
potential. This method is used for the construction of several families of
classical string solutions, one of which turns out to be the spiky strings in
AdS(3). New solutions include circular rotating strings in AdS(3) with singular
time evolution of their radius and angular velocity as well as classical string
solutions in dS(3).Comment: 60 pages, 13 figures, v2: version to appear in JHEP after minor
correction
|
On Elliptic String Solutions in AdS(3) and dS(3)
|
on elliptic string solutions in ads(3) and ds(3)
|
sinh gordon cosh gordon pohlmeyer reduction. constructing translationally pohlmeyer counterpart solving schrodinger problems. lame eigenvalues additionally satisfy constraints. solving employing connection lame potential. families turns spiky strings circular rotating strings singular .comment pages jhep minor
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non_dup
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[] |
42668771
|
10.1007/JHEP07(2016)071
|
We provide a semiclassical description of framed BPS states in
four-dimensional N = 2 super Yang-Mills theories probed by 't Hooft defects, in
terms of a supersymmetric quantum mechanics on the moduli space of singular
monopoles. Framed BPS states, like their ordinary counterparts in the theory
without defects, are associated with the L^2 kernel of certain Dirac operators
on moduli space, or equivalently with the L^2 cohomology of related Dolbeault
operators. The Dirac/Dolbeault operators depend on two Cartan-valued Higgs
vevs. We conjecture a map between these vevs and the Seiberg-Witten special
coordinates, consistent with a one-loop analysis and checked in examples. The
map incorporates all perturbative and nonperturbative corrections that are
relevant for the semiclassical construction of BPS states, over a suitably
defined weak coupling regime of the Coulomb branch. We use this map to
translate wall crossing formulae and the no-exotics theorem to statements about
the Dirac/Dolbeault operators. The no-exotics theorem, concerning the absence
of nontrivial SU(2)_R representations in the BPS spectrum, implies that the
kernel of the Dirac operator is chiral, and further translates into a statement
that all L^2 cohomology of the Dolbeault operator is concentrated in the middle
degree. Wall crossing formulae lead to detailed predictions for where the Dirac
operators fail to be Fredholm and how their kernels jump. We explore these
predictions in nontrivial examples. This paper explains the background and
arguments behind the results announced in a short accompanying note.Comment: v1: 161+78 pages, 5 figures; v2: typos correcte
|
Semiclassical framed BPS states
|
semiclassical framed bps states
|
semiclassical framed super mills probed hooft defects supersymmetric mechanics moduli singular monopoles. framed ordinary counterparts defects kernel dirac moduli equivalently cohomology dolbeault operators. dirac dolbeault cartan valued vevs. conjecture vevs seiberg witten checked examples. incorporates perturbative nonperturbative semiclassical suitably coulomb branch. translate crossing formulae exotics statements dirac dolbeault operators. exotics concerning nontrivial representations kernel dirac chiral translates statement cohomology dolbeault concentrated degree. crossing formulae dirac fail fredholm kernels jump. explore nontrivial examples. explains arguments behind announced accompanying pages typos correcte
|
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[] |
42649508
|
10.1007/JHEP07(2016)072
|
Simple Composite Higgs models predict new vector-like fermions not too far
from the electroweak scale, yet LHC limits are now sensitive to the TeV scale.
Motivated by this tension, we explore the holographic dual of the minimal
model, MCHM5, to understand how far naive 4D predictions are from their 5D
duals. Interestingly, we find that the usual hierarchy among the vector-like
quarks is not generic, hence ameliorating the tuning issue. We find that
lowering the UV cutoff in the 5D picture allows for heavier top partners, while
keeping the mass of the Higgs boson at its observed value. In the 4D dual this
corresponds to increasing the number of colours. This is essentially a Little
Randall-Sundrum Model, which are known to reduce some flavour and electroweak
constraints. Furthermore, in anticipation of the ongoing efforts at the LHC to
put bounds on the top Yukawa, we demonstrate that deviations from the SM can be
suppressed or enhanced with respect to what is expected from mere symmetry
arguments in 4D. We conclude that the 5D holographic realisation of the MCHM5
with a small UV cutoff is not in tension with the current experimental data.Comment: In v.2 we edited the plot in the last section and added some
discussio
|
Exploring holographic Composite Higgs models
|
exploring holographic composite higgs models
|
composite predict fermions electroweak scale. motivated tension explore holographic mchm naive duals. interestingly usual hierarchy quarks generic ameliorating tuning issue. lowering cutoff picture heavier partners keeping boson value. colours. essentially randall sundrum flavour electroweak constraints. anticipation ongoing efforts bounds yukawa deviations suppressed mere arguments holographic realisation mchm cutoff tension edited discussio
|
non_dup
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[] |
42713649
|
10.1007/JHEP07(2016)073
|
Recently, the complex Langevin method has been applied successfully to finite
density QCD either in the deconfinement phase or in the heavy dense limit with
the aid of a new technique called the gauge cooling. In the confinement phase
with light quarks, however, convergence to wrong limits occurs due to the
singularity in the drift term caused by small eigenvalues of the Dirac operator
including the mass term. We propose that this singular-drift problem should
also be overcome by the gauge cooling with different criteria for choosing the
complexified gauge transformation. The idea is tested in chiral Random Matrix
Theory for finite density QCD, where exact results are reproduced at zero
temperature with light quarks. It is shown that the gauge cooling indeed
changes drastically the eigenvalue distribution of the Dirac operator measured
during the Langevin process. Despite its non-holomorphic nature, this
eigenvalue distribution has a universal diverging behavior at the origin in the
chiral limit due to a generalized Banks-Casher relation as we confirm
explicitly.Comment: 20 pages, 4 figures. One reference is added in version
|
Gauge cooling for the singular-drift problem in the complex Langevin
method --a test in Random Matrix Theory for finite density QCD
|
gauge cooling for the singular-drift problem in the complex langevin method --a test in random matrix theory for finite density qcd
|
langevin successfully deconfinement dense cooling. confinement quarks wrong singularity drift eigenvalues dirac term. propose singular drift overcome cooling choosing complexified transformation. chiral reproduced quarks. cooling drastically eigenvalue dirac langevin process. holomorphic eigenvalue universal diverging chiral banks casher confirm pages figures.
|
non_dup
|
[] |
42672612
|
10.1007/JHEP07(2016)074
|
We argue that the Kovtun--Son--Starinets (KSS) lower bound on the viscosity
to entropy density ratio holds in fluid systems but is violated in solid
materials with a non-zero shear elastic modulus. We construct explicit examples
of this by applying the standard gauge/gravity duality methods to massive
gravity and show that the KSS bound is clearly violated in black brane
solutions whenever the massive gravity theories are of solid type. We argue
that the physical reason for the bound violation relies on the viscoelastic
nature of the mechanical response in these materials. We speculate on whether
any real-world materials can violate the bound and discuss a possible
generalization of the bound that involves the ratio of the shear elastic
modulus to the pressure.Comment: typo in the conclusions correcte
|
Viscosity bound violation in holographic solids and the viscoelastic
response
|
viscosity bound violation in holographic solids and the viscoelastic response
|
argue kovtun starinets viscosity violated elastic modulus. duality massive violated brane whenever massive type. argue violation relies viscoelastic materials. speculate violate generalization involves elastic modulus typo correcte
|
non_dup
|
[] |
42652518
|
10.1007/JHEP07(2016)075
|
In the light of recent experimental results on $\theta_{13}^{pmns}$, we
re-investigate the complementarity between the quark and lepton mixing matrices
and obtain predictions for most unsettled neutrino mixing parameters like
$\theta_{23}^{pmns}$ and CP violating phase invariants $J$, $S_1$ and $S_2$.
This paper is motivated by our previous work where in a QLC model we predicted
the value for $\theta_{13}^{pmns}=(9{^{+1}_{-2}})^\circ$, which was found to be
in strong agreement with the experimental results. In the QLC model the
non-trivial correlation between CKM and PMNS mixing matrices is given by a
correlation matrix ($V_{c}$). We do numerical simulation and estimate the
texture of the $V_{c}$ and in our findings we get a small deviation from the
Tri-Bi-Maximal (TBM) texture and a large from the Bi-Maximal one, which is
consistent with the work already reported in literature. In the further
investigation we obtain quite constrained limits for
$sin^2{\theta_{23}^{pmns}}= 0.4235_{-0.0043}^{+0.0032}$ that is narrower to the
existing ones. We also obtain the constrained limits for the three CP violating
phase invariants $J$, $S_1$ and $S_2$: as $J < 0.0315$, $S_{1} <0.12$ and
$S_{2} <0.08$, respectively.Comment: 18 pages, 10 figure
|
Quark-Lepton Complementarity Predictions for $\theta_{23}^{pmns}$ and CP
Violation
|
quark-lepton complementarity predictions for $\theta_{23}^{pmns}$ and cp violation
|
theta pmns complementarity lepton unsettled theta pmns violating invariants motivated theta pmns circ results. trivial pmns texture maximal texture maximal literature. constrained theta pmns narrower ones. constrained violating invariants pages
|
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[] |
42657088
|
10.1007/JHEP07(2016)076
|
We propose a field theoretic framework for calculating the dependence of
R\'enyi entropies on the shape of the entangling surface in a conformal field
theory. Our approach rests on regarding the corresponding twist operator as a
conformal defect and in particular, we define the displacement operator which
implements small local deformations of the entangling surface. We identify a
simple constraint between the coefficient defining the two-point function of
the displacement operator and the conformal weight of the twist operator, which
consolidates a number of distinct conjectures on the shape dependence of the
R\'enyi entropy. As an example, using this approach, we examine a conjecture
regarding the universal coefficient associated with a conical singularity in
the entangling surface for CFTs in any number of spacetime dimensions. We also
provide a general formula for the second order variation of the R\'enyi entropy
arising from small deformations of a spherical entangling surface, extending
Mezei's results for the entanglement entropy.Comment: 37 pages, typos corrected, section 6 and appendix C expanded,
references adde
|
R\'enyi entropy and conformal defects
|
r\'enyi entropy and conformal defects
|
propose theoretic calculating enyi entropies entangling conformal theory. rests twist conformal defect displacement implements deformations entangling surface. defining displacement conformal twist consolidates conjectures enyi entropy. examine conjecture universal conical singularity entangling cfts spacetime dimensions. enyi arising deformations spherical entangling extending mezei entanglement pages typos corrected expanded adde
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non_dup
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[] |
42719534
|
10.1007/JHEP07(2016)078
|
We investigate lepton flavor violation (LFV) in the the singlet-triplet
scotogenic model in which neutrinos acquire non-zero masses at the 1-loop
level. In contrast to the most popular variant of this setup, the singlet
scotogenic model, this version includes a triplet fermion as well as a triplet
scalar, leading to a scenario with a richer dark matter phenomenology. Taking
into account results from neutrino oscillation experiments, we explore some
aspects of the LFV phenomenology of the model. In particular, we study the
relative weight of the dipole operators with respect to other contributions to
the LFV amplitudes and determine the most constraining observables. We show
that in large portions of the parameter space, the most promising experimental
perspectives are found for LFV 3-body decays and for coherent $\mu-e$
conversion in nuclei.Comment: 25 pages, 5 figures; v2:minor changes, matches published versio
|
Lepton Flavor Violation in the singlet-triplet scotogenic model
|
lepton flavor violation in the singlet-triplet scotogenic model
|
lepton flavor violation singlet triplet scotogenic neutrinos acquire level. popular variant setup singlet scotogenic triplet fermion triplet richer phenomenology. oscillation explore phenomenology model. dipole amplitudes constraining observables. portions promising perspectives decays coherent conversion pages minor matches versio
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non_dup
|
[] |
42688782
|
10.1007/JHEP07(2016)079
|
We have investigated the upper bound of the radiation energy in the head-on
collision of two Myers-Perry black holes. Initially, the two black holes are
far away from each other, and they become one black hole after the collision.
We have obtained the upper bound of the radiation energy thermodynamically
allowed in the process. The upper bound of the radiation energy is obtained in
general dimensions. The radiation bound depends on the alignments of rotating
axes for a given initial condition due to spin-spin interaction. We have found
that the collision may not be occurred for a initially ultra-spinning black
hole.Comment: 12 pages, 15 figures, published version in JHE
|
The Upper Bound of Radiation Energy in the Myers-Perry Black Hole
Collision
|
the upper bound of radiation energy in the myers-perry black hole collision
|
collision myers perry holes. initially holes away collision. thermodynamically process. dimensions. alignments rotating axes interaction. collision occurred initially ultra spinning pages
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42699411
|
10.1007/JHEP07(2016)080
|
Tree-level double-color-ordered amplitudes are computed using Berends--Giele
recursion relations applied to the bi-adjoint cubic scalar theory. The standard
notion of Berends--Giele currents is generalized to double-currents and their
recursions are derived from a perturbiner expansion of linearized fields that
solve the non-linear field equations. Two applications are given. Firstly, we
prove that the entries of the inverse KLT matrix are equal to Berends--Giele
double-currents (and are therefore easy to compute). And secondly, a simple
formula to generate tree-level BCJ-satisfying numerators for arbitrary
multiplicity is proposed by evaluating the field-theory limit of tree-level
string amplitudes for various color orderings using double-color-ordered
amplitudes.Comment: 15 pages, harvmac TeX, v2: published versio
|
Berends-Giele recursion for double-color-ordered amplitudes
|
berends-giele recursion for double-color-ordered amplitudes
|
ordered amplitudes berends giele recursion adjoint cubic theory. notion berends giele currents currents recursions perturbiner linearized solve equations. given. firstly entries berends giele currents secondly satisfying numerators multiplicity evaluating amplitudes orderings ordered pages harvmac versio
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42687772
|
10.1007/JHEP07(2016)081
|
We discuss a residual freedom of the next-to-leading BFKL eigenvalue that
originates from ambiguity in redistributing the next-to-leading~(NLO)
corrections between the adjoint BFKL eigenvalue and eigenfunctions in planar
$\mathcal{N}=4$ super-Yang-Mills~(SYM) Theory. In terms of the remainder
function of the Bern-Dixon-Smirnov~(BDS) amplitude this freedom is translated
to reshuffling correction between the eigenvalue and the impact factors in the
multi-Regge kinematics~(MRK) in the next-to-leading logarithm
approximation~(NLA). We show that the modified NLO BFKL eigenvalue suggested by
the authors can be introduced in the MRK expression for the remainder function
by shifting the anomalous dimension in the impact factor in such a way that the
two and three loop remainder function is left unchanged to the NLA accuracy.Comment: 15 pages, 1 figur
|
On a residual freedom of the next-to-leading BFKL eigenvalue in color
adjoint representation in planar $\mathcal{N} = 4$ SYM
|
on a residual freedom of the next-to-leading bfkl eigenvalue in color adjoint representation in planar $\mathcal{n} = 4$ sym
|
residual freedom bfkl eigenvalue originates ambiguity redistributing adjoint bfkl eigenvalue eigenfunctions planar mathcal super mills theory. remainder bern dixon smirnov freedom translated reshuffling eigenvalue regge kinematics logarithm bfkl eigenvalue remainder shifting anomalous remainder unchanged pages figur
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42673306
|
10.1007/JHEP07(2016)082
|
With the eventual aim of classifying renormalization group flows between 6D
superconformal field theories (SCFTs), we study flows generated by the vevs of
"conformal matter," a generalization of conventional hypermultiplets which
naturally appear in the F-theory classification of 6D SCFTs. We consider flows
in which the parent UV theory is (on its partial tensor branch) a linear chain
of gauge groups connected by conformal matter, with one flavor group G at each
end of the chain, and in which the symmetry breaking of the conformal matter at
each end is parameterized by the orbit of a nilpotent element, i.e. T-brane
data, of one of these flavor symmetries. Such nilpotent orbits admit a partial
ordering, which is reflected in a hierarchy of IR fixed points. For each such
nilpotent orbit, we determine the corresponding tensor branch for the resulting
SCFT. An important feature of this algebraic approach is that it also allows us
to systematically compute the unbroken flavor symmetries inherited from the
parent UV theory.Comment: v2: 53 pages, 12 figures, clarifications added, typos correcte
|
6D RG Flows and Nilpotent Hierarchies
|
6d rg flows and nilpotent hierarchies
|
eventual classifying renormalization flows superconformal scfts flows vevs conformal generalization hypermultiplets naturally scfts. flows parent branch conformal flavor breaking conformal parameterized orbit nilpotent i.e. brane flavor symmetries. nilpotent orbits admit ordering reflected hierarchy points. nilpotent orbit branch scft. algebraic systematically unbroken flavor symmetries inherited parent pages clarifications typos correcte
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42727939
|
10.1007/JHEP07(2016)083
|
We present a set of NLO SUSY-QCD calculations for the pair production of
neutralinos and charginos at the LHC, and their matching to parton-shower
programs in the framework of the POWHEG-BOX program package. The code we have
developed provides a SUSY Les Houches Accord interface for setting
supersymmetric input parameters. Decays of the neutralinos and charginos and
parton-shower effects can be simulated with PYTHIA. To illustrate the
capabilities of our program, we present phenomenological results for a
representative SUSY parameter point. We find that NLO-QCD corrections increase
the production rates for neutralinos and charginos significantly. The impact of
parton-shower effects on distributions of the weakinos is small, but
non-negligible for jet distributions.Comment: 20 pages, 9 figures. v2: minor changes in text and references,
matches published versio
|
Electroweakino pair production at the LHC: NLO SUSY-QCD corrections and
parton-shower effects
|
electroweakino pair production at the lhc: nlo susy-qcd corrections and parton-shower effects
|
susy neutralinos charginos matching parton shower programs powheg package. susy houches accord supersymmetric parameters. decays neutralinos charginos parton shower pythia. illustrate capabilities phenomenological susy point. neutralinos charginos significantly. parton shower weakinos negligible pages figures. minor matches versio
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non_dup
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[] |
42691815
|
10.1007/JHEP07(2016)084
|
In this paper, we consider the decoherence patterns of a topological qubit
made of two Majorana zero modes in the generic linear and circular motions in
the Minkowski spacetime. We show that the reduced dynamics is exact without
Markov approximation. Our results imply that the acceleration will cause
thermalization as expected by Unruh effect. However, for the short-time scale,
we find the rate of decoherence is anti-correlated with the acceleration, as
kind of decoherence impedance. This is in fact related to the "anti-Unruh"
phenomenon previously found by studying the transition probability of
Unruh-DeWitt detector. We also obtain the information backflow by some time
modulations of coupling constant or acceleration, which is a characteristic of
the underlying non-Markovian reduced dynamics. Moreover, by exploiting the
nonlocal nature of the topological qubit, we find that some incoherent
accelerations of the constituent Majorana zero modes can preserve the coherence
instead of thermalizing it.Comment: 39 pages, 15 figures; v2: typos corrected; v3: minor typos correction
matching JHEP versio
|
Decoherence of Topological Qubit in Linear and Circular Motions:
Decoherence Impedance, Anti-Unruh and Information Backflow
|
decoherence of topological qubit in linear and circular motions: decoherence impedance, anti-unruh and information backflow
|
decoherence topological qubit majorana generic circular motions minkowski spacetime. markov approximation. imply acceleration thermalization unruh effect. decoherence acceleration kind decoherence impedance. unruh phenomenon studying unruh dewitt detector. backflow modulations acceleration markovian dynamics. exploiting nonlocal topological qubit incoherent accelerations constituent majorana preserve coherence thermalizing pages typos corrected minor typos matching jhep versio
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non_dup
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[] |
42705973
|
10.1007/JHEP07(2016)085
|
Black hole solutions of type IIB supergravity were previously found that are
dual to N=4 supersymmetric Yang-Mills plasma with an anisotropic spatial
deformation. In the zero temperature limit, these black holes approach a
Liftshitz like scaling solution in the IR. It was recently shown that these
black holes are unstable, and at low temperatures there is a new class of black
hole solutions that are thermodynamically preferred. We extend this analysis,
by considering consistent truncations of the Kaluza-Klein reduction of IIB
supergravity on a five-sphere that preserves multiple scalar and $U(1)$ gauge
fields. We show that the previously constructed black holes become unstable at
low temperatures, and construct new classes of exotic black hole solutions. We
study the DC thermo-electric conductivity of these $U(1)$ charged black holes,
and find a diverging DC conductivity at zero temperature due to the divergence
of the gauge field coupling.Comment: 30 pages, 8 figure
|
Phase transitions of an anisotropic N=4 super Yang-Mills plasma via
holography
|
phase transitions of an anisotropic n=4 super yang-mills plasma via holography
|
supergravity supersymmetric mills anisotropic deformation. holes liftshitz holes unstable thermodynamically preferred. extend truncations kaluza klein supergravity sphere preserves fields. holes unstable exotic solutions. thermo conductivity holes diverging conductivity divergence pages
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non_dup
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42721350
|
10.1007/JHEP07(2016)086
|
We study a class of non-exotic minimal $U(1) '$ extensions of the Standard
Model, which includes all scenarios that are anomaly-free with the ordinary
fermion content augmented by one Right-Handed neutrino per generation, wherein
the new Abelian gauge group is spontaneously broken by the non-zero Vacuum
Expectation Value of an additional Higgs singlet field, in turn providing mass
to a $Z'$ state. By adopting the $B-L$ example, whose results can be recast
into those pertaining to the whole aforementioned class, and allowing for both
scalar and gauge mixing, we first extract the surviving parameter space in
presence of up-to-date theoretical and experimental constraints. Over the
corresponding parameter configurations, we then delineate the high energy
behaviour of such constructs in terms of their stability and perturbativity.
Finally, we highlight key production and decay channels of the new states
entering the spectra of this class of models, i.e., heavy neutrinos, a second
Higgs state and the $Z'$, which are amenable to experimental investigation at
the Large Hadron Collider. We therefore set the stage to establish a direct
link between measurements obtainable at the Electro-Weak scale and the dynamics
of the underlying model up to those where a Grand Unification Theory embedding
a $U(1)'$ can be realised.Comment: 32 pages, 59 figures, journal versio
|
$Z'$, Higgses and heavy neutrinos in $U(1)'$ models: from the LHC to the
GUT scale
|
$z'$, higgses and heavy neutrinos in $u(1)'$ models: from the lhc to the gut scale
|
exotic extensions scenarios anomaly ordinary fermion augmented handed wherein abelian spontaneously broken expectation singlet state. adopting recast pertaining aforementioned allowing extract surviving constraints. configurations delineate constructs perturbativity. highlight entering i.e. neutrinos amenable hadron collider. establish obtainable electro grand unification embedding pages versio
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42718069
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10.1007/JHEP07(2016)090
|
The frequency-dependent longitudinal and Hall conductivities ---
$\sigma_{xx}$ and $\sigma_{xy}$ --- are dimensionless functions of $\omega/T$
in 2+1 dimensional CFTs at nonzero temperature. These functions characterize
the spectrum of charged excitations of the theory and are basic experimental
observables. We compute these conductivities for large $N$ Chern-Simons theory
with fermion matter. The computation is exact in the 't Hooft coupling
$\lambda$ at $N = \infty$. We describe various physical features of the
conductivity, including an explicit relation between the weight of the delta
function at $\omega = 0$ in $\sigma_{xx}$ and the existence of infinitely many
higher spin conserved currents in the theory. We also compute the
conductivities perturbatively in Chern-Simons theory with scalar matter and
show that the resulting functions of $\omega/T$ agree with the strong coupling
fermionic result. This provides a new test of the conjectured 3d bosonization
duality. In matching the Hall conductivities we resolve an outstanding puzzle
by carefully treating an extra anomaly that arises in the regularization scheme
used.Comment: 27 pages + appendice
|
Transport in Chern-Simons-Matter Theories
|
transport in chern-simons-matter theories
|
longitudinal hall conductivities sigma sigma dimensionless omega cfts nonzero temperature. characterize excitations observables. conductivities chern simons fermion matter. hooft lambda infty conductivity delta omega sigma infinitely conserved currents theory. conductivities perturbatively chern simons omega agree fermionic result. conjectured bosonization duality. matching hall conductivities resolve outstanding puzzle carefully treating extra anomaly arises regularization pages appendice
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non_dup
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42718197
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10.1007/JHEP07(2016)092
|
Motivated by the various indications that holographic superfluid is BCS like
at the standard quantization but BEC like at the alternative quantization, we
have implemented the alternative quantization in the dynamical holographic
superfluid for the first time. With this accomplishment, we further initiate
the detailed investigation of quantum turbulence in finite temperature BEC by a
long time stable numerical simulation of bulk dynamics, which includes the two
body decay of vortex number caused by vortex pair annihilation, the onset of
superfluid turbulence signaled by Kolmogorov scaling law, and a direct energy
cascade demonstrated by injecting energy to the turbulent superfluid. All of
these results share the same patterns as the holographic superfluid at the
standard quantization, thus suggest that these should be universal features for
quantum turbulence at temperatures order of the critical temperature.Comment: 16 pages, 9 figures, 1 table References added and clarifications mad
|
Towards Quantum Turbulence in Finite Temperature Bose-Einstein
Condensates
|
towards quantum turbulence in finite temperature bose-einstein condensates
|
motivated indications holographic superfluid quantization quantization implemented quantization holographic superfluid time. accomplishment initiate turbulence vortex vortex annihilation onset superfluid turbulence signaled kolmogorov cascade injecting turbulent superfluid. share holographic superfluid quantization universal turbulence pages clarifications
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42692657
|
10.1007/JHEP07(2016)094
|
We argue that extensions of the Standard Model (SM) with a warped extra
dimension, which successfully address the hierarchy and flavor problems of
elementary particle physics, can provide an elegant explanation of the 750 GeV
diphoton excess recently reported by ATLAS and CMS. A gauge-singlet bulk scalar
with ${\cal O}(1)$ couplings to fermions is identified as the new resonance
$S$, and the vector-like Kaluza-Klein excitations of the SM quarks and leptons
mediate its loop-induced couplings to photons and gluons. The electroweak gauge
symmetry almost unambiguously dictates the bulk matter content and hence the
hierarchies of the $S\to \gamma\gamma$, $WW$, $ZZ$, $Z\gamma$, $t\bar t$ and
dijet decay rates. We find that the $S\to Z\gamma$ decay mode is strongly
suppressed, such that $\mbox{Br}(S\to
Z\gamma)/\mbox{Br}(S\to\gamma\gamma)<0.1$. The hierarchy problem for the new
scalar boson is solved in analogy with the Higgs boson by localizing it near
the infrared brane. The infinite sums over the Kaluza-Klein towers of fermion
states are finite and can be calculated in closed form with a remarkably simple
result. Reproducing the observed $pp\to S\to\gamma\gamma$ signal requires
Kaluza-Klein masses in the multi-TeV range, consistent with bounds from flavor
physics and electroweak precision observables.
Useful side products of our analysis, which can be adapted to almost any
model for the diphoton resonance, are the calculation of the gluon-fusion
production cross section $\sigma(pp\to S)$ at NNLO in QCD, an exact expression
for the inclusive $S\to gg$ decay rate at N$^3$LO, a study of the $S\to t\bar t
h$ three-body decay and a phenomenological analysis of portal couplings
connecting $S$ with the Higgs field.Comment: 31 pages, 7 figures, 3 tables; v2: typos fixed and some references
added; v3: missing color factor in t tbar rates included and numerical
results updated, extended discussion of the Higgs portal, version published
in JHE
|
Diphoton Resonance from a Warped Extra Dimension
|
diphoton resonance from a warped extra dimension
|
argue extensions warped extra successfully hierarchy flavor elementary elegant explanation diphoton excess atlas cms. singlet couplings fermions kaluza klein excitations quarks leptons mediate couplings photons gluons. electroweak unambiguously dictates hierarchies gamma gamma gamma dijet rates. gamma suppressed mbox gamma mbox gamma gamma hierarchy boson solved analogy boson localizing infrared brane. infinite sums kaluza klein towers fermion remarkably result. reproducing gamma gamma kaluza klein bounds flavor electroweak precision observables. adapted diphoton gluon fusion sigma nnlo inclusive phenomenological portal couplings connecting pages tables typos missing tbar updated portal
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non_dup
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[] |
42697779
|
10.1007/JHEP07(2016)095
|
Current data (LHC direct searches, Higgs mass, dark matter-related bounds)
severely affect the constrained minimal SUSY standard model (CMSSM) with
neutralinos as dark matter candidates. But the evidence for neutrino masses
coming from oscillations requires extending the SM with at least right-handed
neutrinos with a Dirac mass term. In turn, this implies extending the CMSSM
with right-handed sneutrino superpartners, a scenario we dub $\tilde\nu$CMSSM.
These additional states constitute alternative dark matter candidates of the
superWIMP type, produced via the decay of the long-lived next-to-lightest SUSY
particle (NLSP). Here we consider the interesting and likely case where the
NLSP is a $\tilde{\tau}$: despite the modest extension with respect to the
CMSSM this scenario has the distinctive signatures of heavy, stable charged
particles. After taking into account the role played by neutrino mass bounds
and the specific cosmological bounds from the big bang nucleosynthesis in
selecting the viable parameter space, we discuss the excellent discovery
prospects for this model at the future runs of the LHC. We show that it is
possible to probe $\tilde{\tau}$ masses up to 600 GeV at the 14 TeV LHC with
$\mathcal{L} = 1100$ fb$^{-1}$ when one considers a pair production of staus
with two or more hard jets through all SUSY processes. We also show the
complementary discovery prospects from a direct $\tilde{\tau}$ pair production,
as well as at the new experiment MoEDAL.Comment: 31 pages, 6 figures and 5 tables; v2 : discussions and references
added, conclusions unchanged. To appear in JHE
|
Signatures of sneutrino dark matter in an extension of the CMSSM
|
signatures of sneutrino dark matter in an extension of the cmssm
|
searches bounds severely constrained susy cmssm neutralinos candidates. coming oscillations extending handed neutrinos dirac term. extending cmssm handed sneutrino superpartners tilde cmssm. constitute candidates superwimp lived lightest susy nlsp nlsp tilde modest cmssm distinctive signatures particles. played bounds cosmological bounds bang nucleosynthesis selecting viable excellent discovery prospects runs lhc. tilde mathcal considers staus jets susy processes. complementary discovery prospects tilde pages tables discussions unchanged.
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non_dup
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[] |
42649085
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10.1007/JHEP07(2016)096
|
We provide an example of a 4D theory that exhibits the
Contino-Pomarol-Rattazzi mechanism, where breaking conformal symmetry by an
almost marginal operator leads to a light pseudo-Goldstone boson, the dilaton,
and a parametrically suppressed contribution to vacuum energy. We consider SUSY
QCD at the edge of the conformal window and break conformal symmetry by weakly
gauging a subgroup of the flavor symmetry. Using Seiberg duality we show that
for a range of parameters the singlet meson in the dual theory reaches the
unitarity bound, however, this theory does not have a stable vacuum. We
stabilize the vacuum with soft breaking terms, compute the mass of the dilaton,
and determine the range of parameters where the leading contribution to the
dilaton mass is from the almost marginal coupling.Comment: 12 pages, no figure
|
Marginal Breaking of Conformal SUSY QCD
|
marginal breaking of conformal susy qcd
|
exhibits contino pomarol rattazzi breaking conformal marginal pseudo goldstone boson dilaton parametrically suppressed energy. susy conformal window break conformal weakly gauging subgroup flavor symmetry. seiberg duality singlet meson reaches unitarity vacuum. stabilize breaking dilaton dilaton marginal pages
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non_dup
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[] |
42693699
|
10.1007/JHEP07(2016)097
|
One main obstacle for any beyond the SM (BSM) scenario solving the hierarchy
problem is its potentially large contributions to electric dipole moments. An
elegant way to avoid this problem is to have the light SM fermions couple to
the BSM sector only through bilinears, $\bar ff$. This possibility can be
neatly implemented in composite Higgs models. We study the implications of
dynamically generating the fermion Yukawa couplings at different scales,
relating larger scales to lighter SM fermions. We show that all flavor and
CP-violating constraints can be easily accommodated for a BSM scale of few TeV,
without requiring any extra symmetry. Contributions to B physics are mainly
mediated by the top, giving a predictive pattern of deviations in $\Delta F=2$
and $\Delta F=1$ flavor observables that could be seen in future experiments.Comment: 25 pages, 5 figures; v2: corrections in some estimate
|
Flavor hierarchies from dynamical scales
|
flavor hierarchies from dynamical scales
|
obstacle solving hierarchy potentially dipole moments. elegant avoid fermions couple bilinears neatly implemented composite models. dynamically generating fermion yukawa couplings relating lighter fermions. flavor violating accommodated requiring extra symmetry. giving predictive deviations delta delta flavor observables pages
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non_dup
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[] |
42707603
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10.1007/JHEP07(2016)098
|
The light-cone distribution amplitudes (LCDAs) serve as important
non-perturbative inputs for the study of hard exclusive processes. In this
paper, we calculate ten LCDAs at twist-2 for the S-wave and P-wave $B_c$ mesons
up to the next-to-leading order (NLO) of the strong coupling $\alpha_s$ and
leading order of the velocity expansion. Each one of these ten LCDAs is
expressed as a product of a perturbatively calculable distribution and a
universal NRQCD matrix-element. By use of the spin symmetry, only two NRQCD
matrix-elements will be involved. The reduction of the number of
non-perturbative inputs will improve the predictive power of collinear
factorization.Comment: 20 pages, no figure. Match to the published version in JHE
|
The leading twist light-cone distribution amplitudes for the S-wave and
P-wave Bc mesons
|
the leading twist light-cone distribution amplitudes for the s-wave and p-wave bc mesons
|
cone amplitudes lcdas serve perturbative inputs exclusive processes. lcdas twist mesons alpha expansion. lcdas perturbatively calculable universal nrqcd element. nrqcd involved. perturbative inputs predictive collinear pages figure. match
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non_dup
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[] |
42690368
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10.1007/JHEP07(2016)099
|
We develop the path integral formalism for studying cosmological
perturbations in multi-field inflation, which is particularly well suited to
study quantum theories with gauge symmetries such as diffeomorphism invariance.
We formulate the gauge fixing conditions based on the Poisson brackets of the
constraints, from which we derive two convenient gauges that are appropriate
for multi-field inflation. We then adopt the in-in formalism to derive the most
general expression for the power spectrum of the curvature perturbation
including the corrections from the interactions of the curvature mode with
other light degrees of freedom. We also discuss the contributions of the
interactions to the bispectrum.Comment: (v1) 27 pages; (v2) references added and typos corrected, to appear
in Journal of High Energy Physic
|
Path integral for multi-field inflation
|
path integral for multi-field inflation
|
formalism studying cosmological perturbations inflation suited symmetries diffeomorphism invariance. formulate fixing poisson brackets derive convenient gauges inflation. adopt formalism derive curvature perturbation curvature freedom. pages typos corrected physic
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non_dup
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[] |
42661395
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10.1007/JHEP07(2016)100
|
We point out that the MERA network for the ground state of a 1+1-dimensional
conformal field theory has the same structural features as kinematic
space---the geometry of CFT intervals. In holographic theories kinematic space
becomes identified with the space of bulk geodesics studied in integral
geometry. We argue that in these settings MERA is best viewed as a
discretization of the space of bulk geodesics rather than of the bulk geometry
itself. As a test of this kinematic proposal, we compare the MERA
representation of the thermofield-double state with the space of geodesics in
the two-sided BTZ geometry, obtaining a detailed agreement which includes the
entwinement sector. We discuss how the kinematic proposal can be extended to
excited states by generalizing MERA to a broader class of compression networks.Comment: 35 pages, 17 figure
|
Tensor Networks from Kinematic Space
|
tensor networks from kinematic space
|
mera conformal kinematic intervals. holographic kinematic geodesics geometry. argue settings mera viewed discretization geodesics itself. kinematic proposal mera thermofield geodesics sided obtaining entwinement sector. kinematic proposal excited generalizing mera broader compression pages
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non_dup
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[] |
42731936
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10.1007/JHEP07(2016)101
|
LHC results do not confirm conventional natural solutions to the Higgs mass
hierarchy problem, motivating alternative interpretations where a
hierarchically small weak scale is generated from a dimension-less quantum
dynamics. We propose weakly and strongly-coupled models where the field that
breaks classical scale invariance giving mass to itself and to the Higgs is
identified with a possible new resonance within the LHC reach. As an example,
we identify such resonance with the 750 GeV diphoton excess recently reported
by ATLAS and CMS. Such models can be extrapolated up to the Planck scale,
provide Dark Matter candidates and eliminate the SM vacuum instability.Comment: 23 pages, 4 figures; one figure added and title and other wording
changed (version accepted by JHEP
|
The Higgs of the Higgs and the diphoton channel
|
the higgs of the higgs and the diphoton channel
|
confirm hierarchy motivating interpretations hierarchically dynamics. propose weakly breaks invariance giving reach. diphoton excess atlas cms. extrapolated planck candidates eliminate pages title wording changed jhep
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non_dup
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[] |
42675174
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10.1007/JHEP07(2016)102
|
In this letter we study the Higgs mass in the NMSSM with supersymmetry
breaking at high scales $M_{SS}$. With the Standard Model as the effective low
energy theory, the computation of the Higgs mass relies on the matching
condition of the quartic coupling $\lambda$ at $M_{SS}$. In the MSSM, the
latter is fixed to a semi-positive value and, thus, sets an upper bound on the
SUSY-breaking scale near $M_{SS}\simeq 10^{10}\text{GeV}$. In the NMSSM,
$\lambda(M_{SS})$ receives an additional contribution induced by the singlet
which allows for negative values of $\lambda(M_{SS})$. In turn, for the
measured value of the Higgs mass we find that $M_{SS}$ can take any value up to
the GUT scale. Furthermore, the choice of universal soft terms favors
SUSY-breaking scales close to the GUT scale.Comment: 14 pages, 5 figure
|
The Higgs mass and the scale of SUSY breaking in the NMSSM
|
the higgs mass and the scale of susy breaking in the nmssm
|
letter nmssm supersymmetry breaking relies matching quartic lambda mssm susy breaking simeq nmssm lambda receives singlet lambda scale. universal favors susy breaking pages
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non_dup
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[] |
42714878
|
10.1007/JHEP07(2016)103
|
Dotsenko-Fateev and Chern-Simons matrix models, which describe Nekrasov
functions for SYM theories in different dimensions, are all incorporated into
network matrix models with the hidden Ding-Iohara-Miki (DIM) symmetry. This
lifting is especially simple for what we call balanced networks. Then, the Ward
identities (known under the names of Virasoro/W-constraints or loop equations
or regularity condition for qq-characters) are also promoted to the DIM level,
where they all become corollaries of a single identity.Comment: 46 page
|
Explicit examples of DIM constraints for network matrix models
|
explicit examples of dim constraints for network matrix models
|
dotsenko fateev chern simons nekrasov incorporated hidden ding iohara miki symmetry. lifting call balanced networks. ward identities names virasoro regularity characters promoted corollaries
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non_dup
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[] |
42705556
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10.1007/JHEP07(2016)104
|
We study a single field axion inflation model in the presence of an SU(2)
gauge field with a small vev. In order to make the analysis as
model-independent as possible, we consider an arbitrary potential for the axion
that is able to support the slow-roll inflation. The gauge field is coupled to
the axion with a Chern-Simons interaction $\frac{\lambda}{f}F_{\mu\nu}^a\tilde
F_a^{\mu\nu}$ where $\frac{\lambda}{f}\sim\mathcal{O}(10)$. It has a negligible
effect on the background evolution, $\frac{\rho_{_{\rm YM}}}{M_{\rm
Pl}^2H^2}\lesssim\epsilon^2$. However, its quantum fluctuations make a
significant contribution to the cosmic perturbation. In particular, the gauge
field has a spin-2 fluctuation which explicitly breaks the parity between the
left- and right-handed polarization states. The chiral tensor modes are
linearly coupled to the gravitational waves and lead to a circularly polarized
tensor power spectrum comparable to the unpolarized vacuum power spectrum.
Moreover, the scalar sector is modified by the linear scalar fluctuations of
the gauge field. Since the spin-0 and spin-2 fluctuations of the SU(2) gauge
field are independent, the gauge field can, at the same time, generate a
detectable chiral gravitational wave signal and have a negligible contribution
to the scalar fluctuations, in agreement with the current CMB observations.Comment: 34 pages, 8 figures, to appear in JHE
|
Axion Inflation with an SU(2) Gauge Field: Detectable Chiral Gravity
Waves
|
axion inflation with an su(2) gauge field: detectable chiral gravity waves
|
axion inflation vev. axion slow roll inflation. axion chern simons frac lambda tilde frac lambda mathcal negligible frac lesssim epsilon cosmic perturbation. fluctuation explicitly breaks parity handed states. chiral linearly gravitational circularly polarized comparable unpolarized spectrum. field. detectable chiral gravitational negligible pages
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non_dup
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[] |
42716958
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10.1007/JHEP07(2016)105
|
We consider interference effects in the production via gluon fusion in LHC
collisions at 13 TeV and decays into $\gamma \gamma$ and $t {\bar t}$ final
states of one or two putative new resonant states $\Phi$, assumed here to be
scalar and/or pseudo scalar particles. Although our approach is general, we use
for our numerical analysis the example of the putative $750$ GeV state for
which a slight excess was observed in the initial LHC $13$ TeV data. We revisit
previous calculations of the interferences between the heavy-fermion
loop-induced $gg \to \Phi \to \gamma \gamma$ signal and the continuum $gg\to
\gamma\gamma$ QCD background, which can alter the production rate as well as
modify the line-shape and apparent mass. We find a modest enhancement by $\sim
20$% under favorable circumstances, for a large $\Phi$ width. The effect of
interference on the apparent scalar-pseudoscalar mass difference in a
two-Higgs-doublet model is found to be also modest. An exploratory study
indicates that similar effects are to be expected in the $gg \to \Phi \to Z
\gamma$ channel. In this and other models with a large $\Phi$ total width, the
dominant $\Phi$ decays are expected to be into $t \bar t$ final states. We
therefore also study the effects of interference of the $gg\to \Phi \to t\bar
t$ signal with the $gg\to t \bar t$ continuum QCD background and show that in
the presence of standard fermions only in the $gg\to \Phi$ loops, it is
destructive causing a dip in the $t \bar t$ mass distribution. Including
additional vector-like quarks leads to a different picture as peaks followed by
dips can then occur. We use the absence of such effects in ATLAS and CMS data
to constrain models of the production and decays of the $\Phi$ state(s).Comment: 31 pages, v2 contains additional comment
|
Interference Effects in the Decays of Spin-Zero Resonances into $\gamma
\gamma$ and $t\bar{t}$
|
interference effects in the decays of spin-zero resonances into $\gamma \gamma$ and $t\bar{t}$
|
interference gluon fusion collisions decays gamma gamma putative resonant pseudo particles. putative slight excess data. revisit interferences fermion gamma gamma continuum gamma gamma alter modify apparent mass. modest enhancement favorable circumstances width. interference apparent pseudoscalar doublet modest. exploratory gamma channel. decays states. interference continuum fermions loops destructive causing distribution. quarks picture dips occur. atlas constrain decays .comment pages comment
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non_dup
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[] |
42732254
|
10.1007/JHEP07(2016)107
|
Motivated by a recent paper by Rychkov-Tan \cite{Rychkov:2015naa}, we
calculate the anomalous dimensions of the composite operators at the leading
order in various models including a $\phi^3$-theory in $(6-\epsilon)$
dimensions. The method presented here relies only on the classical equation of
motion and the conformal symmetry. In case that only the leading expressions of
the critical exponents are of interest, it is sufficient to reduce the
multiplet recombination discussed in \cite{Rychkov:2015naa} to the classical
equation of motion. We claim that in many cases the use of the classical
equations of motion and the CFT constraint on two- and three-point functions
completely determine the leading behavior of the anomalous dimensions at the
Wilson-Fisher fixed point without any input of the Feynman diagrammatic
calculation. The method developed here is closely related to the one presented
in \cite{Rychkov:2015naa} but based on a more perturbative point of view.Comment: 21 page
|
Classical equation of motion and Anomalous dimensions at leading order
|
classical equation of motion and anomalous dimensions at leading order
|
motivated rychkov cite rychkov anomalous composite epsilon dimensions. relies conformal symmetry. expressions exponents multiplet recombination cite rychkov motion. claim anomalous wilson fisher feynman diagrammatic calculation. closely cite rychkov perturbative
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non_dup
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[] |
42684614
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10.1007/JHEP07(2016)109
|
To measure the last unknown $3\nu$ oscillation parameter ($\delta$), several
long baseline neutrino experiments have been designed or proposed. Recently it
has been shown that turning on neutral current Non-Standard Interactions (NSI)
of neutrinos with matter can induce degeneracies that may even hinder the
proposed state-of-the-art DUNE long baseline experiment from measuring the
value of $\delta$. We study how the result of the proposed MOMENT experiment
with a baseline of 150 km and $200~{\rm MeV}<E_\nu<600~{\rm MeV}$ can help to
solve the degeneracy induced by NSI and determine the true value of $\delta$.Comment: 15 pages, 6 figure
|
CP-Violation and Non-Standard Interactions at the MOMENT
|
cp-violation and non-standard interactions at the moment
|
unknown oscillation delta proposed. turning neutral neutrinos induce degeneracies hinder dune measuring delta moment solve degeneracy delta .comment pages
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non_dup
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[] |
42727574
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10.1007/JHEP07(2016)110
|
The type X (lepton-specific) two-Higgs-doublet model at large $\tan\beta$
becomes leptophilic and thus allows a light pseudoscalar $A$ accommodating the
observed muon $g-2$ deviation without conflicting with various hadronic
constraints. On the other hand, it is strongly constrained by leptonic
precision observables such as lepton universality test in the neutral and
charged currents. Treating all the lepton universality data in a consistent
way, we show how the current data constrain the parameter space of $m_A$ and
$\tan\beta$ for given degenerate masses of heavy Higgs bosons $H$ and $H^\pm$.
While no overlapping region is found at $1\sigma$, a sizable region is still
viable at $2\sigma$ for $H/H^\pm$ masses at around 200$\sim$400 GeV.Comment: 11 pages; v2: 14 pages, 1 figure, version to be published in JHE
|
Leptonic Precision Test of Leptophilic Two-Higgs-Doublet Model
|
leptonic precision test of leptophilic two-higgs-doublet model
|
lepton doublet beta leptophilic pseudoscalar accommodating muon conflicting hadronic constraints. constrained leptonic precision observables lepton universality neutral currents. treating lepton universality constrain beta degenerate bosons overlapping sigma sizable viable sigma pages pages
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non_dup
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[] |
42684760
|
10.1007/JHEP07(2016)111
|
We investigate analytically the properties of the Weyl holographic
superconductor in the Lifshitz black hole background. We find that the critical
temperature of the Weyl superconductor decreases with increasing Lifshitz
dynamical exponent, $z$, indicating that condensation becomes difficult. In
addition, it is found that the critical temperature and condensation operator
could be affected by applying the Weyl coupling, $\gamma$. Moreover, we compute
the critical magnetic field and investigate its dependence on the parameters
$\gamma$ and $z$. Finally, we show numerically that the Weyl coupling parameter
$\gamma$ and the Lifshitz dynamical exponent $z$ together control the size and
strength of the conductivity peak and the ratio of gap frequency over critical
temperature $\omega_{g}/T_{c}$.Comment: 25 pages, 22 figure
|
Weyl holographic superconductor in the Lifshitz black hole background
|
weyl holographic superconductor in the lifshitz black hole background
|
analytically weyl holographic superconductor lifshitz background. weyl superconductor lifshitz exponent condensation difficult. condensation weyl gamma gamma numerically weyl gamma lifshitz exponent conductivity omega .comment pages
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non_dup
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[] |
42696250
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10.1007/JHEP07(2016)112
|
Exact solutions to Einstein's equations for holographic models are presented
and studied. The IR geometry has a timelike cousin of the Kasner singularity,
which is the less generic case of the BKL (Belinski-Khalatnikov-Lifshitz)
singularity, and the UV is asymptotically AdS. This solution describes a
holographic RG flow between them. The solution's appearance is an interpolation
between the planar AdS black hole and the AdS soliton. The causality constraint
is always satisfied. The entanglement entropy and Wilson loops are discussed.
The boundary condition for the current-current correlation function and the
Laplacian in the IR is examined. There is no infalling wave in the IR, but
instead, there is a normalizable solution in the IR. In a special case, a
hyperscaling-violating geometry is obtained after a dimensional reduction.Comment: 22 pages, 3 figures, jheppub; v2: more details added; v3: minor
corrections, title changed; original title: "Analytic anisotropic solutions
for holography
|
Asymptotically AdS spacetimes with a timelike Kasner singularity
|
asymptotically ads spacetimes with a timelike kasner singularity
|
einstein holographic studied. timelike cousin kasner singularity generic belinski khalatnikov lifshitz singularity asymptotically ads. describes holographic them. appearance interpolation planar soliton. causality satisfied. entanglement wilson loops discussed. laplacian examined. infalling normalizable hyperscaling violating pages jheppub minor title changed title analytic anisotropic holography
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non_dup
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[] |
42706726
|
10.1007/JHEP07(2016)113
|
The large level limit of the N=2 minimal models that appear in the duality
with the N=2 supersymmetric higher spin theory on AdS_3 is shown to be a
natural subsector of a certain symmetric orbifold theory. We study the relevant
decompositions in both the untwisted and the twisted sector, and analyse the
structure of the higher spin representations in the twisted sector in some
detail. These results should help to identify the string background of which
the higher spin theory is expected to describe the leading Regge trajectory in
the tensionless limit.Comment: 32 page
|
The symmetric orbifold of N=2 minimal models
|
the symmetric orbifold of n=2 minimal models
|
duality supersymmetric subsector orbifold theory. decompositions untwisted twisted analyse representations twisted detail. regge trajectory tensionless
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non_dup
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[] |
42689736
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10.1007/JHEP07(2016)114
|
We study the relative entropy and the trace square distance, both of which
measure the distance between reduced density matrices of two excited states in
two dimensional conformal field theories. We find a general formula for the
relative entropy between two primary states with the same conformal dimension
in the limit of a single small interval and find that in this case the relative
entropy is proportional to the trace square distance. We check our general
formulae by calculating the relative entropy between two generalized free
fields and the trace square distance between the spin and disorder operators of
the critical Ising model. We also give the leading term of the relative entropy
in the small interval expansion when the two operators have different conformal
dimensions. This turns out to be universal when the CFT has no primaires
lighter than the stress tensor. The result reproduces the previously known
special cases.Comment: 29 pages, 1 figure, references adde
|
Relative entropy of excited states in two dimensional conformal field
theories
|
relative entropy of excited states in two dimensional conformal field theories
|
trace excited conformal theories. conformal trace distance. check formulae calculating trace disorder ising model. conformal dimensions. turns universal primaires lighter tensor. reproduces pages adde
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non_dup
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[] |
42709577
|
10.1007/JHEP07(2016)115
|
We study N = 2 supersymmetric gauge theories with gauge group SU(2) coupled
to fundamental flavours, covering all asymptotically free and conformal cases.
We re-derive, from the conformal field theory perspective, the differential
equations satisfied by omega deformed instanton partition functions. We confirm
their validity at leading order in one of the deformation parameters via a
saddle-point analysis of the partition function. In the semi-classical limit we
show that these differential equations take a form amenable to exact WKB
analysis. We compute the monodromy group associated to the differential
equations in terms of deformed and Borel resummed Seiberg-Witten data. For each
case, we study pairs of Stokes graphs that are related by flips and pops, and
show that the monodromy groups allow one to confirm the Stokes automorphisms
that arise as the phase of the deformation parameter is varied. Finally, we
relate the Borel resummed monodromies with the traditional Seiberg-Witten
variables in the semi-classical limit.Comment: 53 pages, 19 figure
|
Exact WKB Analysis of N = 2 Gauge Theories
|
exact wkb analysis of n = 2 gauge theories
|
supersymmetric flavours covering asymptotically conformal cases. derive conformal perspective satisfied omega deformed instanton partition functions. confirm validity deformation saddle partition function. amenable analysis. monodromy deformed borel resummed seiberg witten data. stokes flips pops monodromy confirm stokes automorphisms arise deformation varied. relate borel resummed monodromies traditional seiberg witten pages
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non_dup
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[] |
42679586
|
10.1007/JHEP07(2016)116
|
Loop-level scattering amplitudes for massless particles have singularities in
regions where tree amplitudes are perfectly smooth. For example, a $2\to4$
gluon scattering process has a singularity in which each incoming gluon splits
into a pair of gluons, followed by a pair of $2\to2$ collisions between the
gluon pairs. This singularity mimics double parton scattering because it occurs
when the transverse momentum of a pair of outgoing gluons vanishes. The
singularity is logarithmic at fixed order in perturbation theory. We exploit
the duality between scattering amplitudes and polygonal Wilson loops to study
six-point amplitudes in this limit to high loop order in planar ${\cal N}=4$
super-Yang-Mills theory. The singular configuration corresponds to the limit in
which a hexagonal Wilson loop develops a self-crossing. The singular terms are
governed by an evolution equation, in which the hexagon mixes into a pair of
boxes; the mixing back is suppressed in the planar (large $N_c$) limit. Because
the kinematic dependence of the box Wilson loops is dictated by (dual)
conformal invariance, the complete kinematic dependence of the singular terms
for the self-crossing hexagon on the one nonsingular variable is determined to
all loop orders. The complete logarithmic dependence on the singular variable
can be obtained through nine loops, up to a couple of constants, using a
correspondence with the multi-Regge limit. As a byproduct, we obtain a simple
formula for the leading logs to all loop orders. We also show that, although
the MHV six-gluon amplitude is singular, remarkably, the transcendental
functions entering the non-MHV amplitude are finite in the same limit, at least
through four loops.Comment: 64 pages, 12 figures, 1 ancillary file; v2: references added, minor
typos corrected, corrected argument of NMHV finiteness in Section 2.1 and
added supporting formulae in Appendix D; v3: minor typos corrected, corrected
formulae (D.13)-(D.17) and the conclusions based on those equations; updated
ancillary fil
|
All orders results for self-crossing Wilson loops mimicking double
parton scattering
|
all orders results for self-crossing wilson loops mimicking double parton scattering
|
amplitudes massless singularities amplitudes perfectly smooth. gluon singularity incoming gluon splits gluons collisions gluon pairs. singularity mimics parton outgoing gluons vanishes. singularity logarithmic perturbation theory. exploit duality amplitudes polygonal wilson loops amplitudes planar super mills theory. singular hexagonal wilson develops crossing. singular governed hexagon mixes boxes suppressed planar limit. kinematic wilson loops dictated conformal invariance kinematic singular crossing hexagon nonsingular orders. logarithmic singular nine loops couple correspondence regge limit. byproduct logs orders. gluon singular remarkably transcendental entering pages ancillary file minor typos corrected corrected argument nmhv finiteness supporting formulae minor typos corrected corrected formulae updated ancillary
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non_dup
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[] |
42694341
|
10.1007/JHEP07(2016)117
|
The absence of fixed momentum excitations in a theory with Lifshitz scale
invariance gives rise to exponential suppression of spectral weight in the
low-frequency limit. In the holographic dual, this suppression arises as a
consequence of a tunneling barrier that decouples the horizon from the
boundary. We compute the spin-1/2 holographic Green's function and show that
the form of the barrier is identical to that of the scalar case. We furthermore
demonstrate that the suppression factor is universal in the $\hat\omega\to0$
limit where $\hat\omega=\omega/|\vec k|^z$. In particular, it depends only on
$\hat\omega$ and the critical exponent $z$, and is independent of scaling
dimension and spin.Comment: 19 pages, 1 figure, references added and comments on exponential
suppression of spectral weight clarifie
|
Holographic Lifshitz fermions and exponentially suppressed spectral
weight
|
holographic lifshitz fermions and exponentially suppressed spectral weight
|
excitations lifshitz invariance exponential suppression limit. holographic suppression arises tunneling barrier decouples horizon boundary. holographic barrier case. suppression universal omega omega omega omega exponent pages comments exponential suppression clarifie
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non_dup
|
[] |
42690141
|
10.1007/JHEP07(2016)118
|
We present the phase diagram and associated fixed points for a wide class of
Gauge-Yukawa theories in $d=4+\epsilon$ dimensions. The theories we investigate
involve non-abelian gauge fields, fermions and scalars in the Veneziano-Witten
limit. The analysis is performed in steps, we start with QCD$_d$ and then we
add Yukawa interactions and scalars which we study at next-to- and
next-to-next-to-leading order. Interacting infrared fixed points naturally
emerge in dimensions lower than four while ultraviolet ones appear above four.
We also analyse the stability of the scalar potential for the discovered fixed
points. We argue for a very rich phase diagram in three dimensions while in
dimensions higher than four certain Gauge-Yukawa theories are ultraviolet
complete because of the emergence of an asymptotically safe fixed point.Comment: RevTeX, 2columns, 9 pages, 6 figure
|
Conformal Gauge-Yukawa Theories away From Four Dimensions
|
conformal gauge-yukawa theories away from four dimensions
|
yukawa epsilon dimensions. involve abelian fermions scalars veneziano witten limit. yukawa scalars order. interacting infrared naturally emerge ultraviolet four. analyse discovered points. argue yukawa ultraviolet emergence asymptotically safe revtex columns pages
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non_dup
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[] |
42689731
|
10.1007/JHEP07(2016)119
|
Several searches for new physics at the LHC require a fixed number of signal
jets, vetoing events with additional jets from QCD radiation. As the probed
scale of new physics gets much larger than the jet-veto scale, such jet vetoes
strongly impact the QCD perturbative series, causing nontrivial theoretical
uncertainties. We consider slepton pair production with 0 signal jets, for
which we perform the resummation of jet-veto logarithms and study its impact.
Currently, the experimental exclusion limits take the jet-veto cut into account
by extrapolating to the inclusive cross section using parton shower Monte
Carlos. Our results indicate that the associated theoretical uncertainties can
be large, and when taken into account have a sizeable impact already on present
exclusion limits. This is improved by performing the resummation to higher
order, which allows us to obtain accurate predictions even for high slepton
masses. For the interpretation of the experimental results to benefit from
improved theory predictions, it would be useful for the experimental analyses
to also provide limits on the unfolded visible 0-jet cross section.Comment: 29 pages, 11 figure
|
Impact of Jet Veto Resummation on Slepton Searches
|
impact of jet veto resummation on slepton searches
|
searches jets vetoing jets radiation. probed gets veto vetoes perturbative causing nontrivial uncertainties. slepton jets resummation veto logarithms impact. exclusion veto extrapolating inclusive parton shower monte carlos. sizeable exclusion limits. performing resummation slepton masses. benefit unfolded visible pages
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non_dup
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[] |
42656574
|
10.1007/JHEP07(2016)120
|
We study the heavy-heavy-light (HHL) three-point functions in the planar N =
4 super-Yang- Mills theory using the recently proposed hexagon bootstrap
program [arXiv:1505.06745]. We prove the conjecture of Bajnok, Janik and
Wereszczynski [arXiv:1404.4556] on the polynomial L-dependence of HHL structure
constant up to the leading finite-size corrections, where L is the length of
the heavy operators. The proof is presented for a specific set-up but the
method can be applied to more general situations.Comment: Minor corrections are implemente
|
Diagonal form factors and hexagon form factors
|
diagonal form factors and hexagon form factors
|
planar super mills hexagon bootstrap conjecture bajnok janik wereszczynski operators. minor implemente
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non_dup
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[] |
42720706
|
10.1007/JHEP07(2016)121
|
In this note we explored the holographic relative entropy in the presence of
the 5d Chern-Simons term, which introduces a mixed gauge-gravity anomaly to the
dual CFT. The theory trivially satisfies an entanglement first law. However, to
quadratic order in perturbations of the stress tensor $T$ and current density
$J$, there is a mixed contribution to the relative entropy bi-linear in $T$ and
$J$, signalling a potential violation of the positivity of the relative
entropy. Miraculously, the term vanishes up to linear order in a derivative
expansion. This prompted a closer inspection on a different consistency check,
that involves time-delay of a graviton propagating in a charged background,
scattered via a coupling supplied by the Chern-Simons term. The analysis
suggests that the time-delay can take either sign, potentially violating
causality for any finite value of the CS coupling.Comment: 21 pages, Details added, typos fixed, references updated; version to
appear in JHE
|
Relative Entropy, Mixed Gauge-Gravitational Anomaly and Causality
|
relative entropy, mixed gauge-gravitational anomaly and causality
|
explored holographic chern simons introduces anomaly cft. trivially satisfies entanglement law. quadratic perturbations signalling violation positivity entropy. miraculously vanishes expansion. prompted closer inspection consistency check involves delay graviton propagating scattered supplied chern simons term. delay potentially violating causality pages typos updated
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non_dup
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[] |
42739233
|
10.1007/JHEP07(2016)125
|
We analyze higher gauge theories in various dimensions using a supergeometric
method based on a differential graded symplectic manifold, called a
QP-manifold, which is closely related to the BRST-BV formalism in gauge
theories. Extensions of the Lie 2-algebra gauge structure are formulated within
the Lie n-algebra induced by the QP-structure. We find that in 5 and 6
dimensions there are special extensions of the gauge algebra. In these cases, a
restriction of the gauge symmetry by imposing constraints on the auxiliary
gauge fields leads to a covariantized theory. As an example we show that we can
obtain an off-shell covariantized higher gauge theory in 5 dimensions, which is
similar to the one proposed in [1] (arxiv:1206.5643).Comment: 39 page
|
Higher Gauge Theories from Lie n-algebras and Off-Shell Covariantization
|
higher gauge theories from lie n-algebras and off-shell covariantization
|
analyze supergeometric graded symplectic manifold manifold closely brst formalism theories. extensions formulated structure. extensions algebra. restriction imposing auxiliary covariantized theory. covariantized .comment
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non_dup
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[] |
42731603
|
10.1007/JHEP07(2016)128
|
We study the general structure of correlation functions in an
Sp(2n)-invariant formulation of systems of an infinite number of higher-spin
fields. For n=4,8 and 16 these systems comprise the conformal higher-spin
fields in space-time dimensions D=4,6 and 10, respectively, while when n=2, one
deals with conventional D=3 conformal field theories of scalars and spinors. We
show that for n>2 the Sp(2n) symmetry and current conservation makes the
3-point correlators of two (rank-one or rank-two) conserved currents with a
scalar operator be that of free theory.This situation is analogous to the one
in conventional conformal field theories, where conservation of higher-spin
currents implies that the theories are free.Comment: 26 pages, some clarifications added, published versio
|
Correlation Functions of Sp(2n) Invariant Higher-Spin Systems
|
correlation functions of sp(2n) invariant higher-spin systems
|
formulation infinite fields. comprise conformal deals conformal scalars spinors. conservation correlators conserved currents theory.this analogous conformal conservation currents pages clarifications versio
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non_dup
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[] |
42705159
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10.1007/JHEP07(2016)129
|
We present the foundation for a holographic dictionary with depth perception.
The dictionary consists of natural CFT operators whose duals are simple,
diffeomorphism-invariant bulk operators. The CFT operators of interest are the
"OPE blocks," contributions to the OPE from a single conformal family. In
holographic theories, we show that the OPE blocks are dual at leading order in
1/N to integrals of effective bulk fields along geodesics or homogeneous
minimal surfaces in anti-de Sitter space. One widely studied example of an OPE
block is the modular Hamiltonian, which is dual to the fluctuation in the area
of a minimal surface. Thus, our operators pave the way for generalizing the
Ryu-Takayanagi relation to other bulk fields.
Although the OPE blocks are non-local operators in the CFT, they admit a
simple geometric description as fields in kinematic space--the space of pairs
of CFT points. We develop the tools for constructing local bulk operators in
terms of these non-local objects. The OPE blocks also allow for conceptually
clean and technically simple derivations of many results known in the
literature, including linearized Einstein's equations and the relation between
conformal blocks and geodesic Witten diagrams.Comment: 43+10 pages, 21 figures, 3 appendices. As submitted to JHEP, typos
correcte
|
A Stereoscopic Look into the Bulk
|
a stereoscopic look into the bulk
|
foundation holographic dictionary perception. dictionary duals diffeomorphism operators. blocks conformal family. holographic blocks integrals geodesics homogeneous sitter space. widely modular fluctuation surface. pave generalizing takayanagi fields. blocks admit geometric kinematic points. constructing objects. blocks conceptually clean technically derivations linearized einstein conformal blocks geodesic witten pages appendices. submitted jhep typos correcte
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non_dup
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[] |
42702590
|
10.1007/JHEP07(2016)130
|
The Ostrogradsky theorem implies that higher-derivative terms of a single
mechanical variable are either trivial or lead to additional, ghost-like
degrees of freedom. In this letter we systematically investigate how the
introduction of additional variables can remedy this situation. Employing a
Lagrangian analysis, we identify conditions on the Lagrangian to ensure the
existence of primary and secondary constraints that together imply the absence
of Ostrogradsky ghosts. We also show the implications of these conditions for
the structure of the equations of motion as well as possible redefinitions of
the variables. We discuss applications to analogous higher-derivative field
theories such as multi-Galileons and beyond Horndeski.Comment: 8 pages. v3: minor changes, matches version published in JHE
|
Exorcising the Ostrogradsky ghost in coupled systems
|
exorcising the ostrogradsky ghost in coupled systems
|
ostrogradsky trivial ghost freedom. letter systematically remedy situation. employing lagrangian lagrangian ensure imply ostrogradsky ghosts. redefinitions variables. analogous galileons pages. minor matches
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non_dup
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[] |
42705999
|
10.1007/JHEP07(2016)131
|
The Schroedinger eigenvalue problems for the Whittaker-Hill potential
$Q_{2}(x)=\tfrac{1}{2} h^2\cos4x+4h\mu\cos2x$ and the periodic complex
potential $Q_{1}(x)=\tfrac{1}{4}h^2{\rm e}^{-4ix}+2h^2\cos2x$ are studied using
their realizations in two-dimensional conformal field theory (2dCFT). It is
shown that for the weak coupling (small) $h\in\mathbb{R}$ and non-integer
Floquet parameter $\nu\notin\mathbb{Z}$ spectra of hamiltonians
$H_{i}\!=\!-{\rm d}^2/{\rm d}x^2 + Q_{i}(x)$, $i=1,2$ and corresponding two
linearly independent eigenfunctions are given by the classical limit of the
"single flavor" and "two flavors" ($N_f=1,2$) irregular conformal blocks. It is
known that complex non-hermitian hamiltonians which are PT-symmetric (=
invariant under simultaneous parity P and time reversal T transformations) can
have real eigenvalues. The hamiltonian $H_{1}$ is PT-symmetric for
$h,x\in\mathbb{R}$. It is found that $H_{1}$ has a real spectrum in the weak
coupling region for $\nu\in\mathbb{R}\setminus\mathbb{Z}$. This fact in an
elementary way follows from a definition of the $N_f=1$ classical irregular
block. Thus, $H_{1}$ can serve as yet another new model for testing postulates
of PT-symmetric quantum mechanics.Comment: 23 pages, 1 figur
|
Classical irregular blocks, Hill's equation and PT-symmetric periodic
complex potentials
|
classical irregular blocks, hill's equation and pt-symmetric periodic complex potentials
|
schroedinger eigenvalue whittaker hill tfrac tfrac realizations conformal dcft mathbb integer floquet notin mathbb hamiltonians linearly eigenfunctions flavor flavors irregular conformal blocks. hermitian hamiltonians simultaneous parity reversal transformations eigenvalues. mathbb mathbb setminus mathbb elementary irregular block. serve postulates pages figur
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non_dup
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[] |
42683438
|
10.1007/JHEP07(2016)132
|
Antibranes provide some of the most generic ways to uplift Anti-de Sitter
flux compactifications to de Sitter, and there is a growing body of evidence
that antibranes placed in long warped throats such as the Klebanov-Strassler
warped deformed conifold solution have a brane-brane-repelling tachyon. This
tachyon was first found in the regime of parameters in which the backreaction
of the antibranes is large, and its existence was inferred from a highly
nontrivial cancellation of certain terms in the inter-brane potential. We use a
brane effective action approach, similar to that proposed by Michel, Mintun,
Polchinski, Puhm and Saad in arXiv:1412.5702, to analyze antibranes in
Klebanov-Strassler when their backreaction is small, and find a regime of
parameters where all perturbative contributions to the action can be computed
explicitly. We find that the cancellation found at strong coupling is also
present in the weak-coupling regime, and we establish its existence to all
loops. Our calculation indicates that the spectrum of the antibrane worldvolume
theory is not gapped, and may generically have a tachyon. Hence uplifting
mechanisms involving antibranes remain questionable even when backreaction is
small.Comment: 27 pages, 5 figures, v2: Added clarification of statements, version
accepted for publication in JHE
|
Loop corrections to the antibrane potential
|
loop corrections to the antibrane potential
|
antibranes generic ways uplift sitter compactifications sitter growing antibranes placed warped throats klebanov strassler warped deformed conifold brane brane repelling tachyon. tachyon backreaction antibranes inferred nontrivial cancellation brane potential. brane michel mintun polchinski puhm saad analyze antibranes klebanov strassler backreaction perturbative explicitly. cancellation establish loops. antibrane worldvolume gapped generically tachyon. uplifting involving antibranes questionable backreaction pages clarification statements publication
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non_dup
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[] |
42719174
|
10.1007/JHEP07(2016)135
|
We study the complex deformations of orientifolds of D3-branes at toric CY
singularities, using their description in terms of dimer diagrams. We describe
orientifold quotients that have fixed lines or fixed points in the dimer, and
characterize the possibilities to deform them in terms of the behaviour of
zig-zag paths under the orientifold symmetry. The resulting models are
holographic duals to warped throats with orientifold planes. Our systematic
construction provides a general class of configurations which includes models
recently appeared in the context of de Sitter uplift by nilpotent goldstino or
dynamical supersymmetry breaking.Comment: 39 pages, 23 figures. v2: minor corrections don
|
Orientifolds of Warped Throats from Toric Calabi-Yau Singularities
|
orientifolds of warped throats from toric calabi-yau singularities
|
deformations orientifolds branes toric singularities dimer diagrams. orientifold quotients dimer characterize possibilities deform paths orientifold symmetry. holographic duals warped throats orientifold planes. configurations appeared sitter uplift nilpotent goldstino supersymmetry pages figures. minor
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non_dup
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[] |
42682280
|
10.1007/JHEP07(2016)136
|
Precision measurements of the Drell-Yan (DY) cross section at the LHC
constrain new physics scenarios that involve new states with electroweak (EW)
charges. We analyze these constraints and apply them to models that can address
the LHC diphoton excess at 750 GeV. We confront these findings with LEP EW
precision tests and show that DY provides stronger constraints than the LEP
data. While 8 TeV data can already probe some parts of the interesting region
of parameter space, LHC14 results are expected to cover a substantial part of
the relevant terrain. We derive the bounds from the existing data, estimate
LHC14 reach and compare them to the bounds one gets from LEP and future FCC-ee
precision measurements.Comment: 21 pages, 7 figures; v2: minor change
|
Precision Drell-Yan Measurements at the LHC and Implications for the
Diphoton Excess
|
precision drell-yan measurements at the lhc and implications for the diphoton excess
|
precision drell constrain scenarios involve electroweak charges. analyze diphoton excess gev. confront precision stronger data. cover substantial terrain. derive bounds bounds gets precision pages minor
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non_dup
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[] |
42674186
|
10.1007/JHEP07(2016)137
|
The Poincar\'e invariant vacuum is not unique in quantum gravity. The BMS
supertranslation symmetry originally defined at null infinity is spontaneously
broken and results in inequivalent Poincar\'e vacua. In this paper we construct
the unique vacua which interpolate between past and future null infinity in BMS
gauge and which are entirely characterized by an arbitary Goldstone boson
defined on the sphere which breaks BMS invariance. We show that these vacua
contain a defect which carries no Poincar\'e charges but which generically
carries superrotation charges. We argue that there is a huge degeneracy of
vacua with multiple defects. We also present the single defect vacua with its
canonically conjugated source which can be constructed from a Liouville boson
on the stereographic plane. We show that positivity of the energy forces the
stress-tensor of the boson to vanish as a boundary condition. Finite
superrotations, which turn on the sources, are therefore physically ruled out
as canonical transformations around the vacua. Yet, infinitesimal
superrotations are external symplectic symmetries which are associated with
conserved charges which characterize the Goldstone boson.Comment: Accepted in JHEP, comments added, 34 page
|
Vacua of the gravitational field
|
vacua of the gravitational field
|
poincar gravity. supertranslation originally infinity spontaneously broken inequivalent poincar vacua. vacua interpolate infinity entirely arbitary goldstone boson sphere breaks invariance. vacua defect carries poincar charges generically carries superrotation charges. argue huge degeneracy vacua defects. defect vacua canonically conjugated liouville boson stereographic plane. positivity forces boson vanish condition. superrotations physically ruled canonical transformations vacua. infinitesimal superrotations symplectic symmetries conserved charges characterize goldstone jhep comments
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non_dup
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[] |
42722087
|
10.1007/JHEP07(2016)138
|
Using the method of modular-invariant differential equations, we classify a
family of Rational Conformal Field Theories with two and three characters
having no Kac-Moody algebra. In addition to unitary and non-unitary minimal
models, we find "dual" theories whose characters obey bilinear relations with
those of the minimal models to give the Moonshine Module. In some ways this
relation is analogous to cosets of meromorphic CFT's. The theory dual in this
sense to the Ising model has central charge 47/2 and is related to the Baby
Monster Module.Comment: 18 page
|
Two-dimensional RCFT's without Kac-Moody symmetry
|
two-dimensional rcft's without kac-moody symmetry
|
modular classify rational conformal characters moody algebra. unitary unitary characters obey bilinear moonshine module. ways analogous cosets meromorphic ising baby monster
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non_dup
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[] |
42738806
|
10.1007/JHEP07(2016)139
|
We investigate a dilaton gravity model in AdS$_2$ proposed by Almheiri and
Polchinski and develop a 1d effective description in terms of a dynamical
boundary time with a Schwarzian derivative action. We show that the effective
model is equivalent to a 1d version of Liouville theory, and investigate its
dynamics and symmetries via a standard canonical framework. We include the
coupling to arbitrary conformal matter and analyze the effective action in the
presence of possible sources. We compute commutators of local operators at
large time separation, and match the result with the time shift due to a
gravitational shockwave interaction. We study a black hole evaporation process
and comment on the role of entropy in this model.Comment: 32 pages, 6 figures, v3: typos corrected and references added,
matches published versio
|
An Investigation of AdS$_2$ Backreaction and Holography
|
an investigation of ads$_2$ backreaction and holography
|
dilaton almheiri polchinski schwarzian action. liouville symmetries canonical framework. conformal analyze sources. commutators match gravitational shockwave interaction. evaporation comment pages typos corrected matches versio
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non_dup
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[] |
42702678
|
10.1007/JHEP07(2016)140
|
We present a new framework for studying conformal field theories deformed by
one or more relevant operators. The original CFT is described in infinite
volume using a basis of states with definite momentum, $P$, and conformal
Casimir, $\mathcal{C}$. The relevant deformation is then considered using
lightcone quantization, with the resulting Hamiltonian expressed in terms of
this CFT basis. Truncating to states with $\mathcal{C} \leq
\mathcal{C}_{\max}$, one can numerically find the resulting spectrum, as well
as other dynamical quantities, such as spectral densities of operators. This
method requires the introduction of an appropriate regulator, which can be
chosen to preserve the conformal structure of the basis. We check this
framework in three dimensions for various perturbative deformations of a free
scalar CFT, and for the case of a free $O(N)$ CFT deformed by a mass term and a
non-perturbative quartic interaction at large-$N$. In all cases, the truncation
scheme correctly reproduces known analytic results. We also discuss a general
procedure for generating a basis of Casimir eigenstates for a free CFT in any
number of dimensions.Comment: 48+37 pages, 17 figures; v2: references added, small clarification
|
A Conformal Truncation Framework for Infinite-Volume Dynamics
|
a conformal truncation framework for infinite-volume dynamics
|
studying conformal deformed operators. infinite definite conformal casimir mathcal deformation lightcone quantization basis. truncating mathcal mathcal numerically quantities densities operators. regulator preserve conformal basis. check perturbative deformations deformed perturbative quartic truncation correctly reproduces analytic results. generating casimir eigenstates pages clarification
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non_dup
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[] |
42692271
|
10.1007/JHEP07(2016)141
|
Recent LHC data show hints of a new resonance in the diphoton distribution at
an invariant mass of 750 GeV. Interestingly, this new particle might be both CP
odd and play the role of a portal into the dark matter sector. Under these
assumptions and motivated by the fact that the requirement of $SU(2)_L$
invariance automatically implies the coupling of this alleged new resonance to
$ZZ$ and $Z\gamma$, we investigate the current and future constraints coming
from the indirect searches performed through the neutrino telescope IceCube. We
show that these constraints can be stronger than the ones from direct detection
experiments if the dark matter mass is larger than a few hundred GeV.
Furthermore, in the scenario in which the dark matter is a scalar particle, the
IceCube data limit the cross section between the DM and the proton to values
close to the predicted ones for natural values of the parameters.Comment: 20 pages, 6 figures; v2: added references; v3: published version,
with some minor edits and including the exclusion bounds from searches of
gamma ray
|
The 750 GeV Diphoton excess, Dark Matter and Constraints from the
IceCube experiment
|
the 750 gev diphoton excess, dark matter and constraints from the icecube experiment
|
hints diphoton gev. interestingly portal sector. assumptions motivated requirement invariance automatically alleged gamma coming indirect searches telescope icecube. stronger hundred gev. icecube proton pages minor edits exclusion bounds searches gamma
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non_dup
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[] |
42711313
|
10.1007/JHEP07(2016)144
|
We discuss the conditions for an effective field theory (EFT) to give an
adequate low-energy description of an underlying physics beyond the Standard
Model (SM). Starting from the EFT where the SM is extended by dimension-6
operators, experimental data can be used without further assumptions to measure
(or set limits on) the EFT parameters. The interpretation of these results
requires instead a set of broad assumptions (e.g. power counting rules) on the
UV dynamics. This allows one to establish, in a bottom-up approach, the
validity range of the EFT description, and to assess the error associated with
the truncation of the EFT series. We give a practical prescription on how
experimental results could be reported, so that they admit a maximally broad
range of theoretical interpretations. Namely, the experimental constraints on
dimension-6 operators should be reported as functions of the kinematic
variables that set the relevant energy scale of the studied process. This is
especially important for hadron collider experiments where collisions probe a
wide range of energy scales.Comment: 26 pages, 2 figures; v2: Comments and references added, conclusions
unchange
|
On the Validity of the Effective Field Theory Approach to SM Precision
Tests
|
on the validity of the effective field theory approach to sm precision tests
|
adequate assumptions parameters. broad assumptions e.g. counting dynamics. establish validity truncation series. practical prescription admit maximally broad interpretations. kinematic process. hadron collider collisions pages comments unchange
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non_dup
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[] |
42665179
|
10.1007/JHEP07(2016)145
|
We discuss the implications of the significant excesses in the diphoton final
state observed by the LHC experiments ATLAS and CMS around a diphoton invariant
mass of 750 GeV. The interpretation of the excess as a spin-zero s-channel
resonance implies model-independent lower bounds on both its branching ratio
and its coupling to photons, which stringently constrain dynamical models. We
consider both the case where the excess is described by a narrow and a broad
resonance. We also obtain model-independent constraints on the allowed
couplings and branching fractions to final states other than diphotons, by
including the interplay with 8 TeV searches. These results can guide attempts
to construct viable dynamical models of the resonance. Turning to specific
models, our findings suggest that the anomaly cannot be accounted for by the
presence of only an additional singlet or doublet spin-zero field and the
Standard Model degrees of freedom; this includes all two-Higgs-doublet models.
Likewise, heavy scalars in the MSSM cannot explain the excess if stability of
the electroweak vacuum is required, at least in a leading-order analysis. If we
assume that the resonance is broad we find that it is challenging to find a
weakly coupled explanation. However, we provide an existence proof in the form
of a model with vectorlike quarks with large electric charge that is
perturbative up to the 100 TeV scale. For the narrow-resonance case a similar
model can be perturbative up to high scales also with smaller charges. We also
find that, in their simplest form, dilaton models cannot explain the size of
the excess. Some implications for flavor physics are briefly discussed.Comment: 36 pages, 7 figures. v4: added electroweak-boson initial states,
including with photons; minor improvements of presentation; published versio
|
Interpreting a 750 GeV Diphoton Resonance
|
interpreting a 750 gev diphoton resonance
|
excesses diphoton atlas diphoton gev. excess bounds branching photons stringently constrain models. excess narrow broad resonance. couplings branching fractions diphotons interplay searches. guide attempts viable resonance. turning anomaly accounted singlet doublet freedom doublet models. likewise scalars mssm excess electroweak analysis. broad challenging weakly explanation. vectorlike quarks perturbative scale. narrow perturbative charges. simplest dilaton excess. flavor briefly pages figures. electroweak boson photons minor improvements presentation versio
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non_dup
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[] |
42664252
|
10.1007/JHEP07(2016)146
|
A new scheme of the perturbative analysis of the nonlinear HS equations is
developed giving directly the final result for the successive application of
the homotopy integrations which appear in the standard approach. It drastically
simplifies the analysis and results from the application of the standard
spectral sequence approach to the higher-spin covariant derivatives, allowing
us in particular to reduce multiple homotopy integrals resulting from the
successive application of the homotopy trick to a single integral. Efficiency
of the proposed method is illustrated by various examples. In particular, it is
shown how the Central on-shell theorem of the free theory immediately results
from the nonlinear HS field equations with no intermediate computations.Comment: 20 pages, V3: typos corrected, references and acknowledgement added,
normalization of AdS background 1-forms changed; version to appear in JHE
|
Perturbative analysis in higher-spin theories
|
perturbative analysis in higher-spin theories
|
perturbative giving successive homotopy integrations approach. drastically simplifies covariant derivatives allowing homotopy integrals successive homotopy trick integral. illustrated examples. immediately pages typos corrected acknowledgement normalization changed
|
non_dup
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[] |
42641053
|
10.1007/JHEP07(2016)147
|
We analyze radiative processes of a quantum system composed by two identical
two-level atoms interacting with a massless scalar field prepared in the vacuum
state in the presence of perfect reflecting flat mirrors. We consider that the
atoms are prepared in a stationary maximally entangled state. We investigate
the spontaneous transitions rates from the entangled states to the collective
ground state induced by vacuum fluctuations. In the empty-space case, the
spontaneous decay rates can be enhanced or inhibited depending on the specific
entangled state and changes with the distance between the atoms. Next, we
consider the presence of perfect mirrors and impose Dirichlet boundary
conditions on such surfaces. In the presence of a single mirror the transition
rate for the symmetric state undergoes a slight reduction, whereas for the
antisymmetric state our results indicate a slightly enhancement. Finally, we
investigate the effect of multiple reflections by two perfect mirrors on the
transition rates.Comment: submitted version to the journa
|
Boundary effects on radiative processes of two entangled atoms
|
boundary effects on radiative processes of two entangled atoms
|
analyze radiative composed interacting massless perfect reflecting mirrors. stationary maximally entangled state. spontaneous entangled collective fluctuations. empty spontaneous inhibited entangled atoms. perfect mirrors impose dirichlet surfaces. mirror undergoes slight antisymmetric enhancement. reflections perfect mirrors submitted journa
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non_dup
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[] |
42722580
|
10.1007/JHEP07(2016)149
|
Perturbative supersymmetric gauge coupling unification is possible in six
theories where complete SU(5) TeV-scale multiplets of vector matter account for
the size of the reported $750~{\rm GeV}$ diphoton resonance, interpreted as a
singlet multiplet $S = (s+ia)/\sqrt{2}$. One of these has a full generation of
vector matter and a unified gauge coupling $\alpha_G \sim 1$. The diphoton
signal rate is enhanced by loops of vector squarks and sleptons, especially
when the trilinear $A$ couplings are large. If the $SH_u H_d$ coupling is
absent, both $s$ and $a$ can contribute to the resonance, which may then have a
large apparent width if the mass splitting from $s$ and $a$ arises from loops
of vector matter. The width depends sensitively on $A$ parameters and phases of
the vector squark and slepton masses. Vector quarks and/or squarks are expected
to be in reach of the LHC. If the $SH_uH_d$ coupling is present, $a$ leads to a
narrow diphoton resonance, while a second resonance with decays $s \rightarrow
hh, W^+ W^-,ZZ$ is likely to be discovered at future LHC runs. In some of the
theories a non-standard origin or running of the soft parameters is required,
for example involving conformal hidden sector interactions.Comment: 26 pages, 11 figure
|
750 GeV Diphotons: Implications for Supersymmetric Unification II
|
750 gev diphotons: implications for supersymmetric unification ii
|
perturbative supersymmetric unification multiplets diphoton interpreted singlet multiplet sqrt unified alpha diphoton loops squarks sleptons trilinear couplings large. absent apparent splitting arises loops matter. sensitively squark slepton masses. quarks squarks lhc. narrow diphoton decays rightarrow discovered runs. running involving conformal hidden pages
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non_dup
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[] |
42720008
|
10.1007/JHEP07(2016)151
|
We investigate the analytic structure of thermal energy-momentum tensor
correlators at large but finite coupling in quantum field theories with gravity
duals. We compute corrections to the quasinormal spectra of black branes due to
the presence of higher derivative $R^2$ and $R^4$ terms in the action, focusing
on the dual to $\mathcal{N}=4$ SYM theory and Gauss-Bonnet gravity. We observe
the appearance of new poles in the complex frequency plane at finite coupling.
The new poles interfere with hydrodynamic poles of the correlators leading to
the breakdown of hydrodynamic description at a coupling-dependent critical
value of the wave-vector. The dependence of the critical wave vector on the
coupling implies that the range of validity of the hydrodynamic description
increases monotonically with the coupling. The behavior of the quasinormal
spectrum at large but finite coupling may be contrasted with the known
properties of the hierarchy of relaxation times determined by the spectrum of a
linearized kinetic operator at weak coupling. We find that the ratio of a
transport coefficient such as viscosity to the relaxation time determined by
the fundamental non-hydrodynamic quasinormal frequency changes rapidly in the
vicinity of infinite coupling but flattens out for weaker coupling, suggesting
an extrapolation from strong coupling to the kinetic theory result. We note
that the behavior of the quasinormal spectrum is qualitatively different
depending on whether the ratio of shear viscosity to entropy density is greater
or less than the universal, infinite coupling value of $\hbar/4\pi k_B$. In the
former case, the density of poles increases, indicating a formation of branch
cuts in the weak coupling limit, and the spectral function shows the appearance
of narrow peaks. We also discuss the relation of the viscosity-entropy ratio to
conjectured bounds on relaxation time in quantum systems.Comment: V2: 53 pages, 31 figures. References adde
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From strong to weak coupling in holographic models of thermalization
|
from strong to weak coupling in holographic models of thermalization
|
analytic correlators duals. quasinormal branes focusing mathcal gauss bonnet gravity. appearance poles coupling. poles interfere hydrodynamic poles correlators breakdown hydrodynamic vector. validity hydrodynamic monotonically coupling. quasinormal contrasted hierarchy relaxation linearized coupling. viscosity relaxation hydrodynamic quasinormal rapidly vicinity infinite flattens weaker extrapolation result. quasinormal qualitatively viscosity universal infinite hbar former poles branch cuts appearance narrow peaks. viscosity conjectured bounds relaxation pages figures. adde
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non_dup
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[] |
83833298
|
10.1007/JHEP07(2017)002
|
Using the double-copy construction of Yang-Mills-Einstein theories formulated
in our earlier work, we obtain compact presentations for single-trace
Yang-Mills-Einstein tree amplitudes with up to five external gravitons and an
arbitrary number of gluons. These are written as linear combinations of
color-ordered Yang-Mills trees, where the coefficients are given by
color/kinematics-satisfying numerators in a Yang-Mills+\phi^3 theory. The
construction outlined in this paper holds in general dimension and extends
straightforwardly to supergravity theories. For one, two, and three external
gravitons, our expressions give identical or simpler presentations of
amplitudes already constructed through string-theory considerations or the
scattering equations formalism. Our results are based on color/kinematics
duality and gauge invariance, and strongly hint at a recursive structure
underlying the single-trace amplitudes with an arbitrary number of gravitons.
For the single-graviton case, we give amplitudes to any loop order and obtain,
through gauge invariance, new loop-level amplitude relations for Yang-Mills
theory.Comment: 36 pages, 3 figures, v2: minor corrections, journal versio
|
Explicit Formulae for Yang-Mills-Einstein Amplitudes from the Double
Copy
|
explicit formulae for yang-mills-einstein amplitudes from the double copy
|
copy mills einstein formulated presentations trace mills einstein amplitudes gravitons gluons. combinations ordered mills trees kinematics satisfying numerators mills theory. outlined extends straightforwardly supergravity theories. gravitons expressions simpler presentations amplitudes considerations formalism. kinematics duality invariance hint recursive trace amplitudes gravitons. graviton amplitudes invariance mills pages minor versio
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non_dup
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78507720
|
10.1007/JHEP07(2017)004
|
There is no known obstructions, but we have not been aware of any concrete
examples, either. The Wess-Zumino consistency condition for the conformal
anomaly says that $a$ cannot change but does not say anything about $c$. In
supersymmetric models, both $a$ and $c$ are determined from the triangle
t'Hooft anomalies and the unitarity demands that both must be fixed, so the
unitary supersymmetric conformal field theories do not admit such a
possibility. Given this field theory situation, we construct an effective
AdS/CFT model without supersymmetry in which $c$ changes under exactly marginal
deformations. So, yes, we can.Comment: 18 pages, v2: minor corrections, appendix adde
|
Can we change $c$ in four-dimensional CFTs by exactly marginal
deformations?
|
can we change $c$ in four-dimensional cfts by exactly marginal deformations?
|
obstructions aware concrete either. wess zumino consistency conformal anomaly says anything supersymmetric triangle hooft anomalies unitarity demands unitary supersymmetric conformal admit possibility. supersymmetry marginal deformations. pages minor adde
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non_dup
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[] |
83843777
|
10.1007/JHEP07(2017)005
|
We investigate Higgs-boson pair production at the LHC when the final state
system arises from decays of vector-like quarks coupling to the Higgs boson and
the Standard Model quarks. Our phenomenological study includes
next-to-leading-order QCD corrections, which are important to guarantee
accurate predictions, and focuses on a detailed analysis of a di-Higgs signal
in the four $b$-jet channel. Whereas existing Run II CMS and ATLAS analyses are
not specifically designed for probing non-resonant, vector-like-quark induced,
di-Higgs production, we show that they nevertheless offer some potential for
these modes. We then investigate the possibility of distinguishing between the
various di-Higgs production mechanisms by exploiting the kinematic properties
of the signal.Comment: 25 pages, 12 figures and 1 table; figure 1 is updated for correct
bound, references are added, version matches with article published in JHE
|
Probing vector-like quark models with Higgs-boson pair production
|
probing vector-like quark models with higgs-boson pair production
|
boson arises decays quarks boson quarks. phenomenological guarantee focuses channel. atlas probing resonant nevertheless offer modes. distinguishing exploiting kinematic pages updated matches
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non_dup
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[] |
83857826
|
10.1007/JHEP07(2017)008
|
We perform a high precision measurement of the static $q\bar{q}$ potential in
three-dimensional SU($N$) gauge theory with $N=2,3$ and compare the results to
the potential obtained from the effective string theory. In particular, we show
that the exponent of the leading order correction in $1/R$ is 4, as predicted,
and obtain accurate results for the continuum limits of the string tension and
the non-universal boundary coefficient $\bar{b}_2$, including an extensive
analysis of all types of systematic uncertainties. We find that the magnitude
of $\bar{b}_2$ decreases with increasing $N$, leading to the possibility of a
vanishing $\bar{b}_2$ in the large $N$ limit. In the standard form of the
effective string theory possible massive modes and the presence of a rigidity
term are usually not considered, even though they might give a contribution to
the energy levels. To investigate the effect of these terms, we perform a
second analysis, including these contributions. We find that the associated
expression for the potential also provides a good description of the data. The
resulting continuum values for $\bar{b}_2$ are about a factor of 2 smaller than
in the standard analysis, due to contaminations from an additional $1/R^4$
term. However, $\bar{b}_2$ shows a similar decrease in magnitude with
increasing $N$. In the course of this extended analysis we also obtain
continuum results for the masses appearing in the additional terms and we find
that they are around twice as large as the square root of the string tension in
the continuum and compatible between SU(2) and SU(3) gauge theory. In the
follow up papers we will extend our investigations to the large $N$ limit and
excited states of the open flux tube.Comment: 40 pages, 10 figures, 11 table
|
Spectrum of the open QCD flux tube and its effective string description
I: 3d static potential in SU(N=2,3)
|
spectrum of the open qcd flux tube and its effective string description i: 3d static potential in su(n=2,3)
|
precision theory. exponent continuum tension universal extensive uncertainties. vanishing limit. massive rigidity levels. contributions. data. continuum contaminations term. continuum appearing twice tension continuum compatible theory. papers extend investigations excited pages
|
non_dup
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[] |
73957863
|
10.1007/JHEP07(2017)009
|
We study non-analytic behavior in the static charge susceptibility in finite
density states of the ABJM theory using its holographic dual. Emphasis is
placed on a particular state characterized by vanishing entropy density at zero
temperature, and Fermi surface-like singularities in various fermionic
correlation functions. The susceptibility exhibits branch points in the complex
momentum plane, with a real part quantitatively very similar to the location of
the Fermi surface singularities.Comment: 29 pages, 5 figures; v2: Minor additions to overview and discussion,
some references added, version to appear in JHE
|
"$1k_F$" Singularities and Finite Density ABJM Theory at Strong Coupling
|
"$1k_f$" singularities and finite density abjm theory at strong coupling
|
analytic susceptibility abjm holographic dual. emphasis placed vanishing fermi singularities fermionic functions. susceptibility exhibits branch quantitatively fermi pages minor additions overview
|
non_dup
|
[] |
83834658
|
10.1007/JHEP07(2017)010
|
We revisit the numerical computation of the baryon asymmetry from Cold
Electroweak Baryogenesis given the physical Higgs mass. We investigate the
dependence of the asymmetry on the speed at which electroweak symmetry breaking
takes place. The maximum asymmetry does not occur for arbitrarily fast
quenches, but at quench times of about $\tau_q\simeq 16\, m_H^{-1}$, with no
asymmetry created for quenches slower than $\tau_q>30\, m_H^{-1}$. Curiously,
we also find that the overall sign of the asymmetry depends on the quench time.Comment: 9 pages, 5 figure
|
Simulations of Cold Electroweak Baryogenesis: Finding the optimal quench
time
|
simulations of cold electroweak baryogenesis: finding the optimal quench time
|
revisit baryon asymmetry cold electroweak baryogenesis mass. asymmetry electroweak breaking place. asymmetry arbitrarily quenches quench simeq asymmetry created quenches slower curiously asymmetry quench pages
|
non_dup
|
[] |
83845358
|
10.1007/JHEP07(2017)011
|
We present an asymptotically flat, spherically symmetric, static, globally
regular and horizonless solution of SU$(2)$-gauged $\mathcal{N}=1,d=5$
supergravity. The SU$(2)$ gauge field is that of the BPST instanton. We argue
that this solution, analogous to the global monopoles found in $d=4$
$\mathcal{N}=2$ and $\mathcal{N}=4$ gauged supergravities, describes the field
of a single string-theory object which does not contribute to the entropy of
black holes when we add it to them and show that it is, indeed, the dimensional
reduction on T$^{5}$ of the gauge 5-brane. We investigate how the energy of the
solution is concentrated as a function of the instanton's scale showing that it
never violates the hoop conjecture although the curvature grows unboundedly in
the zero scale limit.Comment: 19 pages, 4 figures. Some misprints correcte
|
A gravitating Yang-Mills instanton
|
a gravitating yang-mills instanton
|
asymptotically spherically globally horizonless gauged mathcal supergravity. bpst instanton. argue analogous monopoles mathcal mathcal gauged supergravities describes holes brane. concentrated instanton never violates hoop conjecture curvature grows unboundedly pages figures. misprints correcte
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non_dup
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[] |
83855467
|
10.1007/JHEP07(2017)012
|
We investigate a new type of a two-Higgs-doublet model as a solution of the
muon $g-2$ anomaly. We impose a softly-broken $Z_4$ symmetry to forbid tree
level flavor changing neutral currents in a natural way. This $Z_4$ symmetry
restricts the structure of Yukawa couplings. As a result, extra Higgs boson
couplings to muons are enhanced by a factor of $\tan\beta$, while their
couplings to all the other standard model fermions are suppressed by
$\cot\beta$. Thanks to this coupling property, we can avoid the constraint from
leptonic $\tau$ decays in contrast to the lepton specific two-Higgs-doublet
model, which can explain the muon $g-2$ within the 2$\sigma$ level but cannot
within the $1\sigma$ level due to this constraint. We find that the model can
explain the muon $g-2$ within the 1$\sigma$ level satisfying constraints from
perturbative unitarity, vacuum stability, electroweak precision measurements,
and current LHC data.Comment: 24 pages, 3 figure
|
Muon specific two-Higgs-doublet model
|
muon specific two-higgs-doublet model
|
doublet muon anomaly. impose softly broken forbid flavor changing neutral currents way. restricts yukawa couplings. extra boson couplings muons beta couplings fermions suppressed beta thanks avoid leptonic decays lepton doublet muon sigma sigma constraint. muon sigma satisfying perturbative unitarity electroweak precision pages
|
non_dup
|
[] |
83841252
|
10.1007/JHEP07(2017)015
|
We consider the phenomenon of "tunnelling of the 3rd kind", whereby a
magnetic field may traverse a classically impenetrable barrier by pair creation
of unimpeded quantum fermions. These propagate through the barrier and generate
a magnetic field on the other side. We study this numerically using quantum
fermions coupled to a classical Higgs-gauge system, where we set up a magnetic
field outside a box shielded by two superconducting barriers. We examine the
magnitude of the internal magnetic field, and find agreement with existing
perturbative results within a factor of two.Comment: 21 pages, 6 figure
|
Simulations of "Tunnelling of the 3rd Kind"
|
simulations of "tunnelling of the 3rd kind"
|
phenomenon tunnelling kind whereby traverse classically impenetrable barrier creation unimpeded fermions. propagate barrier side. numerically fermions shielded superconducting barriers. examine perturbative pages
|
non_dup
|
[] |
83853189
|
10.1007/JHEP07(2017)017
|
We present an analytic computation of the Higgs production cross section in
the gluon fusion channel, which is differential in the components of the Higgs
momentum and inclusive in the associated partonic radiation through NNLO in
perturbative QCD. Our computation includes the necessary higher order terms in
the dimensional regulator beyond the finite part that are required for
renormalisation and collinear factorisation at N$^3$LO. We outline in detail
the computational methods which we employ. We present numerical predictions for
realistic final state observables, specifically distributions for the decay
products of the Higgs boson in the $\gamma\gamma$ decay channel.Comment: 27 pages, 6 awesome figure
|
Higgs-differential cross section at NNLO in dimensional regularisation
|
higgs-differential cross section at nnlo in dimensional regularisation
|
analytic gluon fusion inclusive partonic nnlo perturbative qcd. regulator renormalisation collinear factorisation outline employ. realistic observables boson gamma gamma pages awesome
|
non_dup
|
[] |
73381347
|
10.1007/JHEP07(2017)020
|
We study various semiclassical observables in the duality proposed by
Guarino, Jafferis and Varela, between a warped $AdS_4\times$ squashed $S^6$
gravitational solution and a 3 dimensional ${\cal N}=2$ SYM-CS$_k$ conformal
gauge theory, deformed from the maximal $SU(N)$ ${\cal N}=8$ SYM. Baryon
vertices corresponding to particle-like branes have unusual behaviour with $N$
and $k$ and present strong evidence for a certain level-rank duality. Wilson
loops and the anomalous dimensions of operators of high spin scale like
$(N/k)^{3/2}$. The entanglement entropy behaves like in a usual CFT. Giant
magnon operators obey the same law as in 4 dimensional ${\cal N}=4$ SYM, and
giant gravitons are also sub-determinant operators.Comment: 43 pages, no figures; we correct the original solution, propagating
through the text; we also modify the giant magnon analysis; references adde
|
Observables in the Guarino-Jafferis-Varela/CS-SYM duality
|
observables in the guarino-jafferis-varela/cs-sym duality
|
semiclassical observables duality guarino jafferis varela warped squashed gravitational conformal deformed maximal sym. baryon branes unusual duality. wilson loops anomalous entanglement behaves usual cft. giant magnon obey giant gravitons determinant pages propagating modify giant magnon adde
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non_dup
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[] |
73421214
|
10.1007/JHEP07(2017)023
|
We explore a simple solution to the cosmological challenges of the original
Mirror Twin Higgs (MTH) model that leads to interesting implications for
experiment. We consider theories in which both the standard model and mirror
neutrinos acquire masses through the familiar seesaw mechanism, but with a low
right-handed neutrino mass scale of order a few GeV. In these $\nu$MTH models,
the right-handed neutrinos leave the thermal bath while still relativistic. As
the universe expands, these particles eventually become nonrelativistic, and
come to dominate the energy density of the universe before decaying. Decays to
standard model states are preferred, with the result that the visible sector is
left at a higher temperature than the twin sector. Consequently the
contribution of the twin sector to the radiation density in the early universe
is suppressed, allowing the current bounds on this scenario to be satisfied.
However, the energy density in twin radiation remains large enough to be
discovered in future cosmic microwave background experiments. In addition, the
twin neutrinos are significantly heavier than their standard model
counterparts, resulting in a sizable contribution to the overall mass density
in neutrinos that can be detected in upcoming experiments designed to probe the
large scale structure of the universe.Comment: 22 pages, 5 figure
|
Cosmology in Mirror Twin Higgs and Neutrino Masses
|
cosmology in mirror twin higgs and neutrino masses
|
explore cosmological challenges mirror twin experiment. mirror neutrinos acquire familiar seesaw handed gev. handed neutrinos leave bath relativistic. universe expands eventually nonrelativistic come dominate universe decaying. decays preferred visible twin sector. twin universe suppressed allowing bounds satisfied. twin discovered cosmic microwave experiments. twin neutrinos heavier counterparts sizable neutrinos upcoming pages
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non_dup
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[] |
73956305
|
10.1007/JHEP07(2017)024
|
In the AdS/CFT correspondence, bulk information appears to be encoded in the
CFT in a redundant way. A local bulk field corresponds to many different
non-local CFT operators (precursors). We recast this ambiguity in the language
of BRST symmetry, and propose that in the large $N$ limit, the difference
between two precursors is a BRST exact and ghost-free term. Using the BRST
formalism and working in a simple model with global symmetries, we re-derive a
precursor ambiguity appearing in earlier work. Finally, we show within this
model that this BRST ambiguity has the right number of parameters to explain
the freedom to localize precursors within the boundary of an entanglement wedge
order by order in the large $N$ expansion.Comment: 12 page
|
Precursors and BRST Symmetry
|
precursors and brst symmetry
|
correspondence encoded redundant way. precursors recast ambiguity brst propose precursors brst ghost term. brst formalism symmetries derive precursor ambiguity appearing work. brst ambiguity freedom localize precursors entanglement wedge
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non_dup
|
[] |
78507630
|
10.1007/JHEP07(2017)025
|
The well-known problem of the unknown power corrections within QCD improved
factorisation leaves the interpretation of the so-called LHCb anomalies in the
angular observables of B-->K* mu+ mu- as an open problem. In order to
contribute to the question whether they represent a first sign for new physics
beyond the Standard Model or a consequence of underestimated hadronic power
corrections, we present a direct comparison of two global fits to the data
based on the two different assumptions. In addition, we summarise the possible
options to resolve this puzzle in the future.Comment: 17 pages, 8 figure
|
Large hadronic power corrections or new physics in the rare decay B-->K*
mu+ mu- ?
|
large hadronic power corrections or new physics in the rare decay b-->k* mu+ mu- ?
|
unknown factorisation leaves lhcb anomalies observables problem. underestimated hadronic fits assumptions. summarise options resolve puzzle pages
|
non_dup
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[] |
83852539
|
10.1007/JHEP07(2017)026
|
It has recently been reported that certain thin timelike shells undergo
oscillatory motion in AdS. In this paper, we compute two-point function of a
probe field in the geodesic approximation in such an oscillating shell
background. We confirm that the two-point function exhibits an oscillatory
behaviour following the motion of the shell. We show that similar oscillatory
dynamics is possible when the perfect fluid on the shell has a polytropic
equation of state. Moreover, we show that certain ball like configurations in
AdS also exhibit oscillatory motion and comment on how such a solution can be
smoothly matched to an appropriate exterior solution. We also demonstrate that
the weak energy condition is satisfied for these oscillatory configurations.Comment: 23 pages, 5 figures; v2: refs added; v3: JHEP versio
|
Oscillating Shells and Oscillating Balls in AdS
|
oscillating shells and oscillating balls in ads
|
timelike shells undergo oscillatory ads. geodesic oscillating background. confirm exhibits oscillatory shell. oscillatory perfect polytropic state. ball configurations exhibit oscillatory comment smoothly matched exterior solution. satisfied oscillatory pages refs jhep versio
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non_dup
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[] |
83866027
|
10.1007/JHEP07(2017)027
|
We study the dynamics of strings with non-zero winding number around
T-duality defects. We deduce that the physics near the core of such
non-geometric objects involves winding modes that are not captured by the
supergravity approximation, and we argue that such corrections are T-dual to
the modes responsible for quantum corrections of semi-flat elliptic metrics. We
furthermore construct a solution of double field theory that captures part of
such near-core physics.Comment: 27 pages; v2: references added; v3: published version, reference
adde
|
Unwinding strings in semi-flatland
|
unwinding strings in semi-flatland
|
strings winding duality defects. deduce geometric involves winding captured supergravity argue elliptic metrics. captures pages adde
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non_dup
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[] |
83853322
|
10.1007/JHEP07(2017)028
|
We study simultaneous collisions of two, three, and four kinks and antikinks
of the $\phi^6$ model at the same spatial point. Unlike the $\phi^4$ kinks, the
$\phi^6$ kinks are asymmetric and this enriches the variety of the collision
scenarios. In our numerical simulations we observe both reflection and bound
state formation depending on the number of kinks and on their spatial ordering
in the initial configuration. We also analyze the extreme values of the energy
densities and the field gradient observed during the collisions. Our results
suggest that very high energy densities can be produced in multi-kink
collisions in a controllable manner. Appearance of high energy density spots in
multi-kink collisions can be important in various physical applications of the
Klein-Gordon model.Comment: 21 pages, 8 figures; v2: minor changes to match version published in
JHE
|
Multi-kink collisions in the $\phi^6$ model
|
multi-kink collisions in the $\phi^6$ model
|
simultaneous collisions kinks antikinks point. unlike kinks kinks asymmetric enriches collision scenarios. reflection kinks ordering configuration. analyze extreme densities collisions. densities kink collisions controllable manner. appearance spots kink collisions klein gordon pages minor match
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non_dup
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[] |
74251585
|
10.1007/JHEP07(2017)029
|
The numerical conformal bootstrap is used to study mixed correlators in
$\mathcal{N}=1$ superconformal field theories (SCFTs) in $d=4$ spacetime
dimensions. Systems of four-point functions involving scalar chiral and real
operators are analyzed, including the case where the scalar real operator is
the zero component of a global conserved current multiplet. New results on
superconformal blocks as well as universal constraints on the space of 4D
$\mathcal{N}=1$ SCFTs with chiral operators are presented. At the level of
precision used, the conditions under which the putative "minimal" 4D
$\mathcal{N}=1$ SCFT may be isolated into a disconnected allowed region remain
elusive. Nevertheless, new features of the bounds are found that provide
further evidence for the presence of a special solution to crossing symmetry
corresponding to the "minimal" 4D $\mathcal{N}=1$ SCFT.Comment: 33 pages, 12 figures; v2: Some typos fixe
|
Bootstrapping Mixed Correlators in 4D $\mathcal{N}=1$ SCFTs
|
bootstrapping mixed correlators in 4d $\mathcal{n}=1$ scfts
|
conformal bootstrap correlators mathcal superconformal scfts spacetime dimensions. involving chiral conserved multiplet. superconformal blocks universal mathcal scfts chiral presented. precision putative mathcal scft disconnected elusive. nevertheless bounds crossing mathcal pages typos fixe
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non_dup
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[] |
83860540
|
10.1007/JHEP07(2017)030
|
It is known that the expectation value of Wilson loops in the
Gross-Witten-Wadia (GWW) unitary matrix model can be computed exactly at finite
$N$ for arbitrary representations. We study the perturbative and
non-perturbative corrections of Wilson loops in the $1/N$ expansion, either
analytically or numerically using the exact result at finite $N$. As a
by-product of the exact result of Wilson loops, we propose a large $N$ master
field of GWW model. This master field has an interesting eigenvalue
distribution. We also study the Wilson loops in large representations, called
Giant Wilson loops, and comment on the Hagedorn/deconfinement transition of a
unitary matrix model with a double trace interaction.Comment: 38 page
|
Wilson loops in unitary matrix models at finite $N$
|
wilson loops in unitary matrix models at finite $n$
|
expectation wilson loops gross witten wadia unitary representations. perturbative perturbative wilson loops analytically numerically wilson loops propose master model. master eigenvalue distribution. wilson loops representations giant wilson loops comment hagedorn deconfinement unitary trace
|
non_dup
|
[] |
83849173
|
10.1007/JHEP07(2017)032
|
We define "BPS graphs" on punctured Riemann surfaces associated with
$A_{N-1}$ theories of class $\mathcal{S}$. BPS graphs provide a bridge between
two powerful frameworks for studying the spectrum of BPS states: spectral
networks and BPS quivers. They arise from degenerate spectral networks at
maximal intersections of walls of marginal stability on the Coulomb branch.
While the BPS spectrum is ill-defined at such intersections, a BPS graph
captures a useful basis of elementary BPS states. The topology of a BPS graph
encodes a BPS quiver, even for higher-rank theories and for theories with
certain partial punctures. BPS graphs lead to a geometric realization of the
combinatorics of Fock-Goncharov $N$-triangulations and generalize them in
several ways.Comment: 48 pages, 44 figure
|
BPS Graphs: From Spectral Networks to BPS Quivers
|
bps graphs: from spectral networks to bps quivers
|
punctured riemann mathcal bridge powerful frameworks studying quivers. arise degenerate maximal intersections walls marginal coulomb branch. intersections captures elementary states. topology encodes quiver punctures. geometric realization combinatorics fock goncharov triangulations generalize pages
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non_dup
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[] |
73961321
|
10.1007/JHEP07(2017)034
|
We formulate off-shell N=1 superconformal higher spin multiplets in four
spacetime dimensions and briefly discuss their coupling to conformal
supergravity. As an example, we explicitly work out the coupling of the
superconformal gravitino multiplet to conformal supergravity. The corresponding
action is super-Weyl invariant for arbitrary supergravity backgrounds. However,
it is gauge invariant only if the supersymmetric Bach tensor vanishes. This is
similar to linearised conformal supergravity in curved background.Comment: 24 pages; V2: published version; V3: sign factor in (5.12) correcte
|
Off-shell superconformal higher spin multiplets in four dimensions
|
off-shell superconformal higher spin multiplets in four dimensions
|
formulate superconformal multiplets spacetime briefly conformal supergravity. explicitly superconformal gravitino multiplet conformal supergravity. super weyl supergravity backgrounds. supersymmetric bach vanishes. linearised conformal supergravity curved pages correcte
|
non_dup
|
[] |
78509806
|
10.1007/JHEP07(2017)035
|
We develop an effective-field-theory (EFT) framework to analyze the spectra
emerging from lattice simulations of a large class of confining gauge theories.
Simulations of these theories, for which the light-fermion count is not far
below the critical value for transition to infrared conformal behavior, have
indicated the presence of a remarkably light singlet scalar particle. We
incorporate this particle by including a scalar field in the EFT along with the
Nambu-Goldstone bosons (NGB's), and discuss the application of this EFT to
lattice data. We highlight the feature that data on the NGB's alone can tightly
restrict the form of the scalar interactions. As an example, we apply the
framework to lattice data for an SU(3) gauge theory with eight fermion flavors,
concluding that the EFT can describe the data well.Comment: 13 pages, 2 figures, version accepted at JHE
|
Dilaton EFT Framework For Lattice Data
|
dilaton eft framework for lattice data
|
analyze emerging confining theories. fermion count infrared conformal remarkably singlet particle. incorporate nambu goldstone bosons data. highlight tightly restrict interactions. eight fermion flavors concluding pages
|
non_dup
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[] |
73954931
|
10.1007/JHEP07(2017)036
|
We propose and demonstrate a new use for conformal field theory (CFT)
crossing equations in the context of AdS/CFT: the computation of loop
amplitudes in AdS, dual to non-planar correlators in holographic CFTs. Loops in
AdS are largely unexplored, mostly due to technical difficulties in direct
calculations. We revisit this problem, and the dual $1/N$ expansion of CFTs, in
two independent ways. The first is to show how to explicitly solve the crossing
equations to the first subleading order in $1/N^2$, given a leading order
solution. This is done as a systematic expansion in inverse powers of the spin,
to all orders. These expansions can be resummed, leading to the CFT data for
finite values of the spin. Our second approach involves Mellin space. We show
how the polar part of the four-point, loop-level Mellin amplitudes can be fully
reconstructed from the leading-order data. The anomalous dimensions computed
with both methods agree. In the case of $\phi^4$ theory in AdS, our crossing
solution reproduces a previous computation of the one-loop bubble diagram. We
can go further, deriving the four-point scalar triangle diagram in AdS, which
had never been computed. In the process, we show how to analytically derive
anomalous dimensions from Mellin amplitudes with an infinite series of poles,
and discuss applications to more complicated cases such as the ${\cal N}=4$
super-Yang-Mills theory.Comment: 47+12 page
|
Loops in AdS from Conformal Field Theory
|
loops in ads from conformal field theory
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propose conformal crossing amplitudes planar correlators holographic cfts. loops largely unexplored mostly difficulties calculations. revisit cfts ways. explicitly solve crossing subleading solution. powers orders. expansions resummed spin. involves mellin space. polar mellin amplitudes reconstructed data. anomalous agree. crossing reproduces bubble diagram. deriving triangle never computed. analytically derive anomalous mellin amplitudes infinite poles complicated super mills
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non_dup
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73958446
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10.1007/JHEP07(2017)037
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There is a widespread belief among inflationary cosmologists that a local
observer cannot sense super-horizon gravitons. The argument goes that a local
observer would subsume super-horizon gravitons into a redefinition of his
coordinate system. We show that adopting this view for pure gravity on de
Sitter background leads to time variation in the Hubble parameter measured by a
local observer. It also leads to a violation of the gravitational field
equation $R = 4 \Lambda$ because that equation is obeyed by the full metric,
rather than the one which has been cleansed of super-horizon modes.Comment: 20 pages, 2 figures, uses LaTeX2e, version 2 slightly revised for
publicatio
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Causality Implies Inflationary Back-Reaction
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causality implies inflationary back-reaction
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widespread belief inflationary cosmologists observer super horizon gravitons. argument goes observer subsume super horizon gravitons redefinition coordinate system. adopting sitter hubble observer. violation gravitational lambda obeyed cleansed super horizon pages latex revised publicatio
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non_dup
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83855822
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10.1007/JHEP07(2017)039
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We propose a modification of the Skyrme model that supports a self-dual
sector possessing exact non-trivial finite energy solutions. The action of such
a theory possesses the usual quadratic and quartic terms in field derivatives,
but the couplings of the components of the Maurer-Cartan form of the Skyrme
model is made by a non-constant symmetric matrix, instead of the usual Killing
form of the SU(2) Lie algebra. The introduction of such a matrix make the
self-duality equations conformally invariant in three space dimensions, even
though it may break the global internal symmetries of the original Skyrme
model. For the case where that matrix is proportional to the identity we show
that the theory possesses exact self-dual Skyrmions of unity topological
charges.Comment: 12 pages, no figure
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Exact self-duality in a modified Skyrme model
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exact self-duality in a modified skyrme model
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propose modification skyrme supports possessing trivial solutions. possesses usual quadratic quartic derivatives couplings maurer cartan skyrme usual killing algebra. duality conformally break symmetries skyrme model. possesses skyrmions unity topological pages
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non_dup
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73402823
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10.1007/JHEP07(2017)040
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We consider 4d N=1 SCFTs, topologically twisted on compact constant curvature
Riemann surfaces, giving rise to 2d N=(0,2) SCFTs. The exact R-current of these
2d SCFT extremizes the central charge c_{2d}, similarly to the 4d picture,
where the exact R-current maximizes the central charge a_{4d}. There are global
currents that do not mix with the R-current in 4d but their mixing becomes non
trivial in 2d. In this paper we study the holographic dual of this process by
analyzing a 5d N=2 truncation of T^{1,1} with one Betti vector multiplet, dual
to the baryonic current on the CFT side. The holographic realization of the
flow across dimensions connects AdS_5 to AdS_3 vacua in the supergravity
picture. We verify the existence of the flow to AdS_3 solutions and we retrieve
the field theory results for the mixing of the Betti vector with the
graviphoton. Moreover, we extract the central charge from the Brown-Henneaux
formula, matching with the results obtained in field theory. We develop a
general formalism to obtain the central charge of a 2d SCFT from 5d N=2 gauged
supergravity with a generic number of vector multiplets, showing that its
extremization corresponds to an attractor mechanism for the scalars in the
supergravity picture.Comment: 28 pages, 5 figures, typos fixed and additional explanations adde
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Betti multiplets, flows across dimensions and c-extremization
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betti multiplets, flows across dimensions and c-extremization
|
scfts topologically twisted curvature riemann giving scfts. scft extremizes picture maximizes currents trivial holographic analyzing truncation betti multiplet baryonic side. holographic realization connects vacua supergravity picture. verify retrieve betti graviphoton. extract brown henneaux matching theory. formalism scft gauged supergravity generic multiplets extremization attractor scalars supergravity pages typos explanations adde
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non_dup
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73412765
|
10.1007/JHEP07(2017)041
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We provide a recipe to extract the supersymmetric Casimir energy of theories
defined on primary Hopf surfaces directly from the superconformal index. It
involves an $\mathrm{SL(3,\mathbb{Z})}$ transformation acting on the complex
structure moduli of the background geometry. In particular, the known relation
between Casimir energy, index and partition function emerges naturally from
this framework, allowing rewriting of the latter as a modified elliptic
hypergeometric integral. We show this explicitly for $\mathcal{N}=1$ SQCD and
$\mathcal{N}=4$ supersymmetric Yang-Mills theory for all classical gauge
groups, and conjecture that it holds more generally. We also use our method to
derive an expression for the Casimir energy of the nonlagrangian
$\mathcal{N}=2$ SCFT with $\mathrm{E_6}$ flavour symmetry. Furthermore, we
predict an expression for Casimir energy of the $\mathcal{N}=1$
$\mathrm{SP(2N)}$ theory with $\mathrm{SU(8)\times U(1)}$ flavour symmetry that
is part of a multiple duality network, and for the doubled $\mathcal{N}=1$
theory with enhanced $\mathrm{E}_7$ flavour symmetry.Comment: 20 pages, more explicit examples added, published in JHE
|
Supersymmetric Casimir Energy and $\mathrm{SL(3,\mathbb{Z})}$
Transformations
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supersymmetric casimir energy and $\mathrm{sl(3,\mathbb{z})}$ transformations
|
recipe extract supersymmetric casimir hopf superconformal index. involves mathrm mathbb acting moduli geometry. casimir partition emerges naturally allowing rewriting elliptic hypergeometric integral. explicitly mathcal sqcd mathcal supersymmetric mills conjecture generally. derive casimir nonlagrangian mathcal scft mathrm flavour symmetry. predict casimir mathcal mathrm mathrm flavour duality doubled mathcal mathrm flavour pages
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non_dup
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83862692
|
10.1007/JHEP07(2017)042
|
We study a general flat space/boson star transition model in quasi-local
ensemble through approaches familiar from holographic superconductor theories.
We manage to find a parameter $\psi_{2}$, which is proved to be useful in
disclosing properties of phase transitions. In this work, we explore effects of
the scalar mass, scalar charge and St$\ddot{u}$ckelberg mechanism on the
critical phase transition points and the order of transitions mainly from
behaviors of the parameter $\psi_{2}$. We mention that properties of
transitions in quasi-local gravity are strikingly similar to those in
holographic superconductor models. We also obtain an analytical relation
$\psi_{2}\varpropto(\mu-\mu_{c})^{1/2}$, which also holds for the condensed
scalar operator in the holographic insulator/superconductor system in
accordance with mean field theories.Comment: 11 pages, 6 figure
|
Studies of a general flat space/boson star transition model in a box
through a language similar to holographic superconductors
|
studies of a general flat space/boson star transition model in a box through a language similar to holographic superconductors
|
boson quasi ensemble familiar holographic superconductor theories. manage proved disclosing transitions. explore ddot ckelberg behaviors mention quasi strikingly holographic superconductor models. varpropto condensed holographic insulator superconductor accordance pages
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non_dup
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[] |
42744699
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10.1007/JHEP07(2017)043
|
As a low energy effective field theory, classical General Relativity receives
an infrared relevant modification from the conformal trace anomaly of the
energy-momentum tensor of massless, or nearly massless, quantum fields. The
local form of the effective action associated with the trace anomaly is
expressed in terms of a dynamical scalar field that couples to the conformal
factor of the spacetime metric, allowing it to propagate over macroscopic
distances. Linearized around flat spacetime, this semi-classical EFT admits
scalar gravitational wave solutions in addition to the transversely polarized
tensor waves of the classical Einstein theory. The amplitude of the scalar wave
modes, as well as their energy and energy flux which are positive and contain a
monopole moment, are computed. Astrophysical sources for scalar gravitational
waves are considered, with the excited gluonic condensates in the interiors of
neutron stars in merger events with other compact objects likely to provide the
strongest burst signals.Comment: 43 pages, Final published version, including all corrections. Sec. VI
on energy and power radiated in scalar gravitational waves replaces previous
version Sec. V and two Appendice
|
Scalar Gravitational Waves in the Effective Theory of Gravity
|
scalar gravitational waves in the effective theory of gravity
|
relativity receives infrared modification conformal trace anomaly massless nearly massless fields. trace anomaly couples conformal spacetime allowing propagate macroscopic distances. linearized spacetime admits gravitational transversely polarized einstein theory. monopole moment computed. astrophysical gravitational excited gluonic condensates interiors neutron merger strongest burst pages corrections. sec. radiated gravitational replaces sec. appendice
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non_dup
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[] |
42745072
|
10.1007/JHEP07(2017)044
|
We consider the four-point correlator of the stress tensor multiplet in
${\cal N}=4$ SYM in the limit of large central charge $c \sim N^2$. For finite
values of $g^2N$ single-trace intermediate operators arise at order $1/c$ and
this leads to specific poles in the Mellin representation of the correlator.
The sign of the residue at these poles is fixed by unitarity. We consider
solutions consistent with crossing symmetry and this pole structure. We show
that in a certain regime all solutions result in a negative contribution to the
anomalous dimension of twist four operators. The reason behind this is a
positivity property of Mack polynomials that leads to a positivity condition
for the Mellin amplitude. This positivity condition can also be proven by
assuming the correct Regge behaviour for the Mellin amplitude. For large $g^2N$
we recover a tower of solutions in one to one correspondence with local
interactions in a effective field theory in the $AdS$ bulk, with the
appropriate suppression factors, and with definite overall signs. These signs
agree with the signs that would follow from causality constraints on the
effective field theory. The positivity constraints arising from CFT for the
Mellin amplitude take a very similar form to the causality constraint for the
forward limit of the S-matrix.Comment: 27 page
|
Unitarity and positivity constraints for CFT at large central charge
|
unitarity and positivity constraints for cft at large central charge
|
correlator multiplet trace arise poles mellin correlator. residue poles unitarity. crossing pole structure. anomalous twist operators. behind positivity mack polynomials positivity mellin amplitude. positivity proven regge mellin amplitude. recover tower correspondence suppression definite signs. signs agree signs causality theory. positivity arising mellin causality
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non_dup
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[] |
83849396
|
10.1007/JHEP07(2017)045
|
Gauge symmetry enhancing, at specific points of the compactification space,
is a distinguished feature of string theory. In this work we discuss the
breaking of such symmetries with tools provided by Double Field Theory (DFT).
As a main guiding example we discuss the bosonic string compactified on a
circle where, at the self dual radio the generic $U(1)\times U(1)$ gauge
symmetry becomes enhanced to $SU(2)\times SU(2)$. We show that the
enhancing-breaking of the gauge symmetry can be understood through a dependence
of gauge structure constants (fluxes in DFT) on moduli. This dependence, in DFT
description, is encoded in the generalized tangent frame of the double space.
Actually, the explicit T-duality invariant formulation provided by DFT proves
to be a helpful ingredient. The link with string theory results is discussed
and generalizations to generic tori compactifications are addressed.Comment: Minor corrections, extra comments, and references adde
|
Gauge symmetry enhancing-breaking from a Double Field Theory perspective
|
gauge symmetry enhancing-breaking from a double field theory perspective
|
enhancing compactification distinguished theory. breaking symmetries guiding bosonic compactified circle generic enhancing breaking understood fluxes moduli. encoded tangent space. duality formulation proves helpful ingredient. generalizations generic tori compactifications minor extra comments adde
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non_dup
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[] |
78507145
|
10.1007/JHEP07(2017)046
|
We revisit the D0 bound state problems, of the M/IIA duality, with the
Orientifolds. The cases of O4 and O8 have been studied recently, from the
perspective of five-dimensional theories, while the case of O0 has been much
neglected. The computation we perform for D0-O0 states boils down to the Witten
indices for $\mathcal N=16$ $O(m)$ and $Sp(n)$ quantum mechanics, where we
adapt and extend previous analysis by the authors. The twisted partition
function $\Omega$, obtained via localization, proves to be rational, and we
establish a precise relation between $\Omega$ and the integral Witten index
$\mathcal I$, by identifying continuum contributions sector by sector. The
resulting Witten index shows surprisingly large numbers of threshold bound
states but in a manner consistent with M-theory. We close with an exploration
on how the ubiquitous rational invariants of the wall-crossing physics would
generalize to theories with Orientifolds.Comment: 38 page
|
D-Particles on Orientifolds and Rational Invariants
|
d-particles on orientifolds and rational invariants
|
revisit duality orientifolds. perspective neglected. boils witten indices mathcal mechanics adapt extend authors. twisted partition omega localization proves rational establish precise omega witten mathcal identifying continuum sector. witten surprisingly manner theory. exploration ubiquitous rational invariants crossing generalize
|
non_dup
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[] |
83849590
|
10.1007/JHEP07(2017)048
|
We propose a Majorana fermion dark matter in the context of a simple
gauge-Higgs Unification (GHU) scenario based on the gauge group $SU(3)$ x
$U(1)'$ in 5-dimensional Minkowski space with a compactification of the 5th
dimension on $S^1/Z_2$ orbifold. The dark matter particle is identified with
the lightest mode in $SU(3)$ triplet fermions additionally introduced in the
5-dimensional bulk. We find an allowed parameter region for the dark matter
mass around a half of the Standard Model Higgs boson mass, which is consistent
with the observed dark matter density and the constraint from the LUX 2016
result for the direct dark matter search. The entire allowed region will be
covered by, for example, the LUX-ZEPLIN dark matter experiment in the near
future. We also show that in the presence of the bulk $SU(3)$ triplet fermions
the 125 GeV Higgs boson mass is reproduced through the renormalization group
evolution of Higgs quartic coupling with the compactification scale of around
$10^8$ GeV.Comment: 21 pages, 5 figures , published version in JHE
|
Fermion Dark Matter in Gauge-Higgs Unification
|
fermion dark matter in gauge-higgs unification
|
propose majorana fermion unification minkowski compactification orbifold. lightest triplet fermions additionally bulk. boson search. covered zeplin future. triplet fermions boson reproduced renormalization quartic compactification pages
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non_dup
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[] |
83854879
|
10.1007/JHEP07(2017)049
|
We revisit the holographic dictionary for a free massless scalar in AdS$_3$,
focusing on the `singleton' solutions for which the boundary profile is an
arbitrary chiral function. We look for consistent boundary conditions which
include this class of solutions. On one hand, we give a no-go argument that
they cannot be interpreted within any boundary condition which preserves full
conformal invariance. On the other hand, we show that such solutions fit
naturally in a generalization of the Comp\`{e}re-Song-Strominger boundary
conditions, which preserve a chiral Virasoro and current algebra. These
observations have implications for the black hole deconstruction proposal,
which proposes singleton solutions as candidate black hole microstate
geometries. Our results suggest that the chiral boundary condition, which also
contains the extremal BTZ black hole, is the natural setting for
holographically interpreting the black hole deconstruction proposal.Comment: 25p+appendices, 2 figures, published versio
|
Chiral boundary conditions for singletons and W-branes
|
chiral boundary conditions for singletons and w-branes
|
revisit holographic dictionary massless focusing singleton chiral function. look solutions. argument interpreted preserves conformal invariance. naturally generalization comp song strominger preserve chiral virasoro algebra. deconstruction proposal proposes singleton candidate microstate geometries. chiral extremal holographically interpreting deconstruction appendices versio
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non_dup
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[] |
83854225
|
10.1007/JHEP07(2017)050
|
The LUX experiment has recently set very strong constraints on
spin-independent interactions of WIMP with nuclei. These null results can be
accommodated in NMSSM provided that the effective spin-independent coupling of
the LSP to nucleons is suppressed. We investigate thermal relic abundance of
singlino-higgsino LSP in these so-called spin-independent blind spots and
derive current constraints and prospects for direct detection of spin-dependent
interactions of the LSP with nuclei providing strong constraints on parameter
space. We show that if the Higgs boson is the only light scalar the new LUX
constraints set a lower bound on the LSP mass of about 300 GeV except for a
small range around the half of $Z^0$ boson masses where resonant annihilation
via $Z^0$ exchange dominates. XENON1T will probe entire range of LSP masses
except for a tiny $Z^0$-resonant region that may be tested by the LZ
experiment. These conclusions apply to general singlet-doublet dark matter
annihilating dominantly to $t\bar{t}$. Presence of light singlet
(pseudo)scalars generically relaxes the constraints because new LSP (resonant
and non-resonant) annihilation channels become important. Even away from
resonant regions, the lower limit on the LSP mass from LUX is relaxed to about
250 GeV while XENON1T may not be sensitive to the LSP masses above about 400
GeV.Comment: 31 pages, 8 figure
|
Spin-dependent constraints on blind spots for thermal singlino-higgsino
dark matter with(out) light singlets
|
spin-dependent constraints on blind spots for thermal singlino-higgsino dark matter with(out) light singlets
|
wimp nuclei. accommodated nmssm nucleons suppressed. relic abundance singlino higgsino blind spots derive prospects nuclei space. boson boson resonant annihilation dominates. xenon tiny resonant experiment. singlet doublet annihilating dominantly singlet pseudo scalars generically relaxes resonant resonant annihilation important. away resonant relaxed xenon pages
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non_dup
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83863476
|
10.1007/JHEP07(2017)051
|
By combining the algebraic Bethe ansatz and the off-diagonal Bethe ansatz, we
investigate the supersymmetric t-J model with generic open boundaries. The
eigenvalues of the transfer matrix are given in terms of an inhomogeneous T-Q
relation, and the corresponding eigenstates are expressed in terms of nested
Bethe states which have well-defined homogeneous limit. This exact solution
provides basis for further analyzing the thermodynamic properties and
correlation functions of the model.Comment: 17 pages, 2 tables, published versio
|
On the Bethe states of the one-dimensional supersymmetric t-J model with
generic open boundaries
|
on the bethe states of the one-dimensional supersymmetric t-j model with generic open boundaries
|
combining algebraic bethe ansatz diagonal bethe ansatz supersymmetric generic boundaries. eigenvalues inhomogeneous eigenstates nested bethe homogeneous limit. analyzing thermodynamic pages tables versio
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non_dup
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