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2096583
|
10.1007/JHEP09(2010)087
|
We solve for the complete space of linearized deformations of the
Klebanov-Strassler background consistent with the symmetries preserved by a
stack of anti-D3 branes smeared on the $S^3$ of the deformed conifold. We find
that the only solution whose UV physics is consistent with that of a
perturbation produced by anti-D3 branes must have a singularity in the
infrared, coming from NS and RR three-form field strengths whose energy density
diverges. If this singularity is admissible, our solution describes the
backreaction of the anti-D3 branes, and is thus likely to be dual to the
conjectured metastable vacuum in the Klebanov-Strassler field theory. If this
singularity is not admissible, then our analysis strongly suggests that anti-D3
branes do not give rise to metastable Klebanov-Strassler vacua, which would
have dramatic consequences for some string theory constructions of de Sitter
space. Key to this result is a simple, universal form for the force on a probe
D3-brane in our ansatz.Comment: 35 pages, LaTeX. v2: further details provided regarding the IR
singularity and the discussion modified accordingly. typos corrected, refs
adde
|
On the Existence of Meta-stable Vacua in Klebanov-Strassler
|
on the existence of meta-stable vacua in klebanov-strassler
|
solve linearized deformations klebanov strassler symmetries preserved stack branes smeared deformed conifold. perturbation branes singularity infrared coming strengths diverges. singularity admissible describes backreaction branes conjectured metastable klebanov strassler theory. singularity admissible branes metastable klebanov strassler vacua dramatic consequences constructions sitter space. universal brane pages latex. singularity accordingly. typos corrected refs adde
|
non_dup
|
[] |
2118502
|
10.1007/JHEP09(2010)090
|
We study transition form factors for radiative and rare semi-leptonic B-meson
decays into light pseudoscalar or vector mesons, combining theoretical
constraints and phenomenological information from Lattice QCD, light-cone sum
rules, and dispersive bounds. We pay particular attention to form factor
parameterisations which are based on the so-called series expansion, and study
the related systematic uncertainties on a quantitative level. In this context,
we also provide the NLO corrections to the correlation function between two
flavour-changing tensor currents, which enters the unitarity constraints for
the coefficients in the series expansion.Comment: 52 pages; v2: normalization error in (29ff.) corrected, conclusion
about relevance of unitarity bounds modified; form factor fits unaffected;
references added; v3: discussion on truncation of series expansion added,
matches version to be published in JHEP; v4: corrected typos in Tables 5 and
|
Theoretical and Phenomenological Constraints on Form Factors for
Radiative and Semi-Leptonic B-Meson Decays
|
theoretical and phenomenological constraints on form factors for radiative and semi-leptonic b-meson decays
|
radiative rare leptonic meson decays pseudoscalar mesons combining phenomenological cone dispersive bounds. parameterisations level. flavour changing currents enters unitarity pages normalization corrected relevance unitarity bounds fits unaffected truncation matches jhep corrected typos tables
|
non_dup
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[] |
2130634
|
10.1007/JHEP09(2010)093
|
We study superparticle spectra in the superconformal flavor scenario with
non-universal gaugino masses. The non-universality of gaugino masses can lead
to the wino-like or higgsino-like neutralino LSP. Furthermore, it is shown that
the parameter space for the higgsino-like LSP includes the region where the
fine-tuning problem can be improved. The degeneracy of soft scalar masses
squared does not drastically change by taking ratios of gaugino masses of order
one. The degeneracy of scalar masses for squarks and left-handed sleptons would
be good to avoid the FCNC problem but that of right-handed slepton masses is
weak. However, the overall size of right-handed slepton masses become larger
when the bino becomes heavier. It is also pointed out that such region can be
realized, and thus, that would be favorable to avoid the FCNC problem for soft
scalar masses as well as A-terms.Comment: 18 pages, 12 figures, reference added, minor correction
|
Revisiting superparticle spectra in superconformal flavor models
|
revisiting superparticle spectra in superconformal flavor models
|
superparticle superconformal flavor universal gaugino masses. universality gaugino wino higgsino neutralino lsp. higgsino fine tuning improved. degeneracy squared drastically gaugino one. degeneracy squarks handed sleptons avoid fcnc handed slepton weak. handed slepton bino heavier. pointed realized favorable avoid fcnc pages minor
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non_dup
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[] |
2132832
|
10.1007/JHEP09(2010)094
|
We study the motion of a string in the background of the Schwarzschild black
hole in AdS_5 by applying the standard arsenal of dynamical systems. Our
description of the phase space includes: the power spectrum, the largest
Lyapunov exponent, Poincare sections and basins of attractions. We find
convincing evidence that the motion is chaotic. We discuss the implications of
some of the quantities associated with chaotic systems for aspects of the
gauge/gravity correspondence. In particular, we suggest some potential
relevance for the information loss paradox.Comment: 29 pages, 11 figure
|
Chaos in the Gauge/Gravity Correspondence
|
chaos in the gauge/gravity correspondence
|
schwarzschild arsenal systems. lyapunov exponent poincare basins attractions. convincing chaotic. quantities chaotic correspondence. relevance pages
|
non_dup
|
[] |
2137478
|
10.1007/JHEP09(2010)095
|
We present a three-loop O(g^6) calculation of the difference between the
expectation values of Wilson loops evaluated in N=4 and superconformal N=2
supersymmetric Yang-Mills theory with gauge group SU(N) using dimensional
reduction. We find a massive reduction of required Feynman diagrams, leaving
only certain two-matter-loop corrections to the gauge field and associated
scalar propagator. This "diagrammatic difference" leaves a finite result
proportional to the bare propagators and allows the recovery of the zeta(3)
term coming from the matrix model for the 1/2 BPS circular Wilson loop in the
N=2 theory. The result is valid also for closed Wilson loops of general shape.
Comments are made concerning light-like polygons and supersymmetric loops in
the plane and on S^2.Comment: 16 pages. v2 minor changes, to appear in JHEP. v3 corrected
reference
|
Wilson Loops in N=2 Superconformal Yang-Mills Theory
|
wilson loops in n=2 superconformal yang-mills theory
|
expectation wilson loops superconformal supersymmetric mills reduction. massive feynman diagrams leaving propagator. diagrammatic leaves bare propagators recovery zeta coming circular wilson theory. valid wilson loops shape. comments concerning polygons supersymmetric loops pages. minor jhep. corrected
|
non_dup
|
[] |
2114618
|
10.1007/JHEP09(2010)096
|
Neutrinos with hierarchical masses and two large mixing angles may naturally
originate from sequential dominance (SD). Within this framework we present
analytic expressions for the neutrino mixing angles including the
next-to-leading order (NLO) and next-to-next-to-leading order (NNLO)
corrections arising from the second lightest and lightest neutrino masses. The
analytic results for neutrino mixing angles in SD presented here, including the
NLO and NNLO corrections, are applicable to a wide class of models and may
provide useful insights when confronting the models with data from high
precision neutrino experiments. We also point out that for special cases of SD
corresponding to form dominance (FD) the NLO and NNLO corrections both vanish.
For example we study tri-bimaximal (TB) mixing via constrained sequential
dominance (CSD) which involves only a NNLO correction and tri-bimaximal-reactor
(TBR) mixing via partially constrained sequential dominance (PCSD) which
involves a NLO correction suppressed by the small reactor angle and show that
the analytic results have good agreement with the numerical results for these
cases.Comment: 27 pages, 2 figures, version to appear in JHE
|
Neutrino Mixing Angles in Sequential Dominance to NLO and NNLO
|
neutrino mixing angles in sequential dominance to nlo and nnlo
|
neutrinos hierarchical angles naturally originate sequential dominance analytic expressions angles nnlo arising lightest lightest masses. analytic angles nnlo applicable insights confronting precision experiments. dominance nnlo vanish. bimaximal constrained sequential dominance involves nnlo bimaximal reactor partially constrained sequential dominance pcsd involves suppressed reactor analytic pages
|
non_dup
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[] |
2114947
|
10.1007/JHEP09(2010)097
|
Precision predictions for phenomenologically interesting observables such as
the t-tbar invariant mass distribution and forward-backward asymmetry in
top-quark pair production at hadron colliders require control over the
differential cross section in perturbative QCD. In this paper we improve
existing calculations of the doubly differential cross section in the invariant
mass and scattering angle by using techniques from soft-collinear effective
theory to perform an NNLL resummation of threshold logarithms, which become
large when the invariant mass M of the top-quark pair approaches the partonic
center-of-mass energy. We also derive an approximate formula for the
differential cross section at NNLO in fixed-order perturbation theory, which
completely determines the coefficients multiplying the singular plus
distributions. We then match our results in the threshold region with the exact
results at NLO in fixed-order perturbation theory, and perform a numerical
analysis of the invariant mass distribution, the total cross section, and the
forward-backward asymmetry. We argue that these are the most accurate
predictions available for these observables at present. Using MSTW2008NNLO
parton distribution functions (PDFs) along with \alpha_s(M_Z)=0.117 and
m_t=173.1 GeV, we obtain for the inclusive production cross sections at the
Tevatron and LHC the values \sigma_{Tevatron} = (6.30 +-0.19 +0.31-0.23) pb and
\sigma_{LHC} = (149 +- 7 +- 8) pb, where the first error results from scale
variations while the second reflects PDF uncertainties.Comment: 61 pages, 18 figures, version to appear in JHE
|
Renormalization-Group Improved Predictions for Top-Quark Pair Production
at Hadron Colliders
|
renormalization-group improved predictions for top-quark pair production at hadron colliders
|
precision phenomenologically observables tbar backward asymmetry hadron colliders perturbative qcd. doubly collinear nnll resummation logarithms partonic energy. derive approximate nnlo perturbation determines multiplying singular distributions. match perturbation backward asymmetry. argue observables present. mstw nnlo parton pdfs alpha inclusive tevatron sigma tevatron sigma reflects pages
|
non_dup
|
[] |
2127568
|
10.1007/JHEP09(2010)099
|
We extend the work of [4] to support the conjecture that any conformal field
theory with a large N expansion and a large gap in the spectrum of anomalous
dimensions has a local bulk dual. We count to O(1/N^2) the solutions to the
crossing constraints in conformal field theory for a completely general scalar
four-point function and show that, to this order, the counting matches the
number of independent interactions in a general scalar theory on Anti-de Sitter
space. We introduce parity odd conformal blocks for this purpose.Comment: 19 page
|
More Holography from Conformal Field Theory
|
more holography from conformal field theory
|
extend conjecture conformal anomalous dual. count crossing conformal counting matches sitter space. parity conformal blocks
|
non_dup
|
[] |
2118077
|
10.1007/JHEP09(2010)100
|
The symmetries of two-dimensional supersymmetric sigma models on target
spaces with covariantly constant forms associated to special holonomy groups
are analysed. It is shown that each pair of such forms gives rise to a new one,
called a Nijenhuis form, and that there may be further reductions of the
structure group. In many cases of interest there are also covariantly constant
one-forms which also give rise to symmetries. These geometries are of interest
in the context of heterotic supergravity solutions and the associated
reductions are studied from a spacetime point of view via the Killing spinor
equations.Comment: 33 pages, minor modifications, version published in JHE
|
Covariantly constant forms on torsionful geometries from world-sheet and
spacetime perspectives
|
covariantly constant forms on torsionful geometries from world-sheet and spacetime perspectives
|
symmetries supersymmetric sigma covariantly holonomy analysed. nijenhuis reductions group. covariantly symmetries. geometries heterotic supergravity reductions spacetime killing spinor pages minor modifications
|
non_dup
|
[] |
2118079
|
10.1007/JHEP09(2010)101
|
We study the effect of adding lower dimensional brane charges to the 't Hooft
monopole, di-baryon and baryon vertex configurations in $AdS_4 \times
\mathbb{P}^3$. We show that these configurations capture the background fluxes
in a way that depends on the induced charges, and therefore, require additional
fundamental strings in order to cancel the worldvolume tadpoles. The study of
the dynamics reveals that the charges must lie inside some interval in order to
find well defined configurations, a situation familiar from the baryon vertex
in $AdS_5 \times S^5$ with charges. For the baryon vertex and the di-baryon the
number of fundamental strings must also lie inside an allowed interval. Our
configurations are sensitive to the flat $B$-field recently suggested in the
literature. We make some comments on its possible role. We also discuss how
these configurations are modified in the presence of a non-zero Romans mass.Comment: 31 pages, 14 figures, discussion of charges improved, published
versio
|
Charged particle-like branes in ABJM
|
charged particle-like branes in abjm
|
adding brane charges hooft monopole baryon baryon configurations mathbb configurations capture fluxes charges strings cancel worldvolume tadpoles. reveals charges configurations familiar baryon charges. baryon baryon strings interval. configurations literature. comments role. configurations romans pages charges versio
|
non_dup
|
[] |
2118753
|
10.1007/JHEP09(2010)102
|
Currently there exists no known way to construct the Stress-Energy Tensor
$(T_{\mu \nu})$ of the produced medium in heavy ion collisions at strong
coupling from purely theoretical grounds. In this paper, some steps are taken
in that direction. In particular, the evolution of $T_{\mu \nu}$ at strong
coupling and at high energies is being studied for early proper times $(\tau)$.
This is achieved in the context of the AdS/CFT duality by constructing the
evolution of the dual geometry in an AdS$_5$ background. Improving the earlier
works in the literature, the two incident nuclei have an impact parameter $b$
and a non-trivial transverse profile. The nuclear matter is modeled by two
shock waves corresponding to a non-zero five dimensional bulk Stress-Energy
Tensor $J_{MN}$. An analytic formula for $T_{\mu \nu}$ at small $\tau$ is
derived and is used in order to calculate the momentum anisotropy and spatial
eccentricity of the medium produced in the collision as a function of the ratio
$\frac{\tau}{b}$. The result for eccentricity at intermediate $\frac{\tau}{b}$
agrees qualitatively with the results obtained in the context of perturbation
theory and by using hydrodynamic simulations. Finally, the problem of the
negative energy density and its natural connection to the eikonal approximation
is discussed.Comment: 60 pages, 7 figure
|
Heavy Ion Collisions with Transverse Dynamics from Evolving AdS
Geometries
|
heavy ion collisions with transverse dynamics from evolving ads geometries
|
collisions purely grounds. direction. proper duality constructing background. improving incident nuclei trivial profile. modeled shock analytic anisotropy eccentricity collision frac eccentricity frac agrees qualitatively perturbation hydrodynamic simulations. connection eikonal pages
|
non_dup
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[] |
2131948
|
10.1007/JHEP09(2010)104
|
We calculate the rates for the charged lepton flavour violating (LFV) decays
l_i -> l_j gamma, tau -> l pi, tau -> l eta('), mu^- -> e^-e^+e^-, the six
three-body leptonic decays tau^- -> l_i^- l_j^+ l_k^- and the rate for mu-e
conversion in nuclei in the Standard Model (SM3) extended by a fourth
generation of quarks and leptons (SM4), assuming that neutrinos are Dirac
particles. We also calculate branching ratios for K_L -> mu e, K_L -> pi^0 mu
e, B_{d,s} -> mu e, B_{d,s} -> tau e and B_{d,s} -> tau mu. We find that the
pattern of the LFV branching ratios in the SM4 differs significantly from the
one encountered in the MSSM, allowing to distinguish these two models with the
help of LFV processes in a transparent manner. Also differences with respect to
the Littlest Higgs model with T-parity are found. Most importantly the
branching ratios for l_i -> l_j gamma, tau -> l pi, tau -> l eta('), mu^- ->
e^-e^+e^-, tau^- -> e^-e^+e^-, tau^- -> mu^- mu^+ mu^-, tau^- -> e^- mu^+ mu^-
and tau^- -> mu^- e^+ e^- can all still be as large as the present experimental
upper bounds but not necessarily simultaneously. Also the rate for mu-e
conversion in nuclei can reach the corresponding upper bound.Comment: 28 pages, 9 figures, v3: References added, Version to be published in
JHE
|
Lepton Flavour Violation in the Presence of a Fourth Generation of
Quarks and Leptons
|
lepton flavour violation in the presence of a fourth generation of quarks and leptons
|
lepton flavour violating decays gamma leptonic decays conversion nuclei fourth quarks leptons neutrinos dirac particles. branching branching differs encountered mssm allowing distinguish transparent manner. littlest parity found. importantly branching gamma bounds necessarily simultaneously. conversion nuclei pages
|
non_dup
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[] |
2129503
|
10.1007/JHEP09(2010)105
|
Assuming there is a new gauge group in a Hidden Valley, and a new type of
radiation, can we observe it through its effect on the kinematic distributions
of recoiling visible particles? Specifically, what are the collider signatures
of radiation in a hidden sector? We address these questions using a generic
SU(N)-like Hidden Valley model that we implement in Pythia. We find that in
both the e+e- and the LHC cases the kinematic distributions of the visible
particles can be significantly affected by the valley radiation. Without a
proper understanding of such effects, inferred masses of "communicators" and of
invisible particles can be substantially off.Comment: 31 pages, 28 figures removed figure titles,updated 2
references,corrected typo
|
Visible Effects of Invisible Hidden Valley Radiation
|
visible effects of invisible hidden valley radiation
|
hidden valley kinematic recoiling visible collider signatures hidden generic hidden valley implement pythia. kinematic visible valley radiation. proper inferred communicators invisible substantially pages removed titles updated corrected typo
|
non_dup
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[] |
2106198
|
10.1007/JHEP09(2010)106
|
We calculate a number of observables related to particle-antiparticle mixing
and the branching ratios for the most interesting rare and CP-violating K and B
decays in the Standard Model (SM3) extended by a fourth generation of quarks
and leptons (SM4). A model-independent parameterisation of these observables in
terms of gauge-independent functions is adopted, which is useful for studying
the breaking of the universality between K, Bd and Bs systems through
non-minimal flavour violating interactions. We calculate first the mass
differences Delta M_i in the neutral K and B system, the mixing-induced CP
asymmetries S_{psi K_S}, S_{psi phi}, S_{phi K_S}, S_{eta' K_S} and epsilon_K.
Subsequently, a detailed analysis of K^+ -> pi^+ nu nu, K_L -> pi^0 nu nu,
B_{s,d} -> mu^+ mu^-, B -> X_{s,d} nu nu, K_L -> pi^0 l^+ l^-, B -> X_s gamma
and B -> X_{s,d} l^+ l^- is presented, and also epsilon'/epsilon is considered.
For some of these observables the departures from SM3 predictions can still be
spectacular.
We discuss how the new mixing parameters (3 angles, 2 CP phases) can be
determined using the flavour observables in question. We identify the different
hierarchical structures in the SM4 flavour mixing matrix, allowed by
phenomenological and theoretical constraints, and define the corresponding
generalised Wolfenstein expansion. Most importantly, we show how the
characteristic patterns of correlations among the considered flavour
observables allow to distinguish this New Physics scenario from supersymmetric
flavour models, the Littlest Higgs model with T-parity and the Randall-Sundrum
model with custodial protection.Comment: Heavily revised version, added lots of comments, improved
presentation, matches published versio
|
Patterns of Flavour Violation in the Presence of a Fourth Generation of
Quarks and Leptons
|
patterns of flavour violation in the presence of a fourth generation of quarks and leptons
|
observables antiparticle branching rare violating decays fourth quarks leptons parameterisation observables adopted studying breaking universality flavour violating interactions. delta neutral asymmetries epsilon subsequently gamma epsilon epsilon considered. observables departures spectacular. angles flavour observables question. hierarchical flavour phenomenological generalised wolfenstein expansion. importantly flavour observables distinguish supersymmetric flavour littlest parity randall sundrum custodial heavily revised lots comments presentation matches versio
|
non_dup
|
[] |
2113423
|
10.1007/JHEP09(2010)107
|
We write down the simplified TBA equations of the $AdS_5 \times S^5$ string
sigma-model for minimal energy twist-two operators in the sl(2) sector of the
model. By using the linearized version of these TBA equations it is shown that
the wrapping corrected Bethe equations for these states are identical, up to
O(g^8), to the Bethe equations calculated in the generalized L\"uscher approach
(Bajnok-Janik formula). Applications of the Bajnok-Janik formula to
relativistic integrable models, the nonlinear O(n) sigma models for n=2,3,4 and
the SU(n) principal sigma models, are also discussed.Comment: Latex, 22 pages, published versio
|
The Bajnok-Janik formula and wrapping corrections
|
the bajnok-janik formula and wrapping corrections
|
simplified sigma twist model. linearized wrapping corrected bethe bethe uscher bajnok janik bajnok janik relativistic integrable sigma principal sigma latex pages versio
|
non_dup
|
[] |
2138808
|
10.1007/JHEP09(2010)110
|
The definition and computation of the topological susceptibility in
non-abelian gauge theories is complicated by the presence of non-integrable
short-distance singularities. Recently, alternative representations of the
susceptibility were discovered, which are singularity-free and do not require
renormalization. Such an expression is here studied quantitatively, using the
lattice formulation of the SU(3) gauge theory and numerical simulations. The
results confirm the expected scaling of the susceptibility with respect to the
lattice spacing and they also agree, within errors, with computations of the
susceptibility based on the use of a chiral lattice Dirac operator.Comment: Plain TeX source, 14 pages, 1 figure; v3: further typos corrected,
version published in JHE
|
Universality of the topological susceptibility in the SU(3) gauge theory
|
universality of the topological susceptibility in the su(3) gauge theory
|
topological susceptibility abelian complicated integrable singularities. representations susceptibility discovered singularity renormalization. quantitatively formulation simulations. confirm susceptibility spacing agree computations susceptibility chiral dirac plain pages typos corrected
|
non_dup
|
[] |
2083852
|
10.1007/JHEP09(2010)111
|
We study the phenomenology of mixed-sneutrino dark matter in the Minimal
R-Symmetric Supersymmetric Standard Model (MRSSM). Mixed sneutrinos fit
naturally within the MRSSM, as the smallness (or absence) of neutrino Yukawa
couplings singles out sneutrino A-terms as the only ones not automatically
forbidden by R-symmetry. We perform a study of randomly generated sneutrino
mass matrices and find that (i) the measured value of $\Omega_{DM}$ is well
within the range of typical values obtained for the relic abundance of the
lightest sneutrino, (ii) with small lepton-number-violating mass terms
$m_{nn}^{2} {\tilde n} {\tilde n}$ for the right-handed sneutrinos, random
matrices satisfying the $\Omega_{DM}$ constraint have a decent probability of
satisfying direct detection constraints, and much of the remaining parameter
space will be probed by upcoming experiments, (iii) the $m_{nn}^{2} {\tilde n}
{\tilde n}$ terms radiatively generate appropriately small Majorana neutrino
masses, with neutrino oscillation data favoring a mostly sterile lightest
sneutrino with a dominantly mu/tau-flavored active component, and (iv) a
sneutrino LSP with a significant mu component can lead to striking signals of
e-mu flavor violation in dilepton invariant-mass distributions at the LHC.Comment: Revised collider analysis in Sec. 5 after fixing error in particle
spectrum, References adde
|
Neutrino Mass, Sneutrino Dark Matter and Signals of Lepton Flavor
Violation in the MRSSM
|
neutrino mass, sneutrino dark matter and signals of lepton flavor violation in the mrssm
|
phenomenology sneutrino supersymmetric mrssm sneutrinos naturally mrssm smallness yukawa couplings singles sneutrino automatically forbidden symmetry. randomly sneutrino omega relic abundance lightest sneutrino lepton violating tilde tilde handed sneutrinos satisfying omega decent satisfying probed upcoming tilde tilde radiatively appropriately majorana oscillation favoring mostly sterile lightest sneutrino dominantly flavored sneutrino striking flavor violation dilepton revised collider sec. fixing adde
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non_dup
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[] |
2128017
|
10.1007/JHEP09(2010)112
|
It was demonstrated recently that there is an upper bound of the Chern-Simons
coupling of the five-dimensional Einstein-Maxwell theory, beyond which the
electrically charged AdS_2 \times S^3 vacuum solution becomes unstable. We
generalize the result to a general class of gravity theories involving
Chern-Simons and/or transgression terms and find their upper bounds for
stability. We show that supergravities with AdS \times Sphere vacua satisfy the
bounds.Comment: 18 pages, no figures, revised version to appear in JHE
|
Instability by Chern-Simons and/or Transgressions
|
instability by chern-simons and/or transgressions
|
chern simons einstein maxwell electrically unstable. generalize involving chern simons transgression bounds stability. supergravities sphere vacua satisfy pages revised
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non_dup
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2131044
|
10.1007/JHEP09(2010)113
|
We make use of O(2r+1) spinning particle models to construct linearized
higher-spin curvatures in (A)dS spaces for fields of arbitrary half-integer
spin propagating in a space of arbitrary (even) dimension: the field
potentials, whose curvatures are computed with the present models, are
spinor-tensors of mixed symmetry corresponding to Young tableaux with D/2 - 1
rows and r columns, thus reducing to totally symmetric spinor-tensors in four
dimensions. The paper generalizes similar results obtained in the context of
integer spins in (A)dS.Comment: 1+18 pages; minor changes in the notation, references updated.
Published versio
|
Half-integer Higher Spin Fields in (A)dS from Spinning Particle Models
|
half-integer higher spin fields in (a)ds from spinning particle models
|
spinning linearized curvatures integer propagating potentials curvatures spinor tensors tableaux rows columns reducing totally spinor tensors dimensions. generalizes integer spins pages minor notation updated. versio
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non_dup
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[] |
2132487
|
10.1007/JHEP09(2010)114
|
Following the anomalous like-sign dimuon charge asymmetry measured by the D0
collaboration at the Tevatron collider we discuss the implications of large CP
violation in $B_{d,s}$ mixing for Supersymmetric (SUSY) Standard Models,
focussing on those models which allow a family symmetry and unification. For
the Minimal Supersymmetric Standard Model (MSSM) we show that it is only
possible to account for $B_{s}$ mixing and CP violation at the expense of large
squark mixing which would require a new approach to family symmetry models. In
order to describe both $B_{s}$ and $B_{d}$ mixing and CP violation we are led
to consider SUSY models with Higgs fields transforming as triplets under a
family symmetry. We describe a realistic such model based on $\Delta_{27}$
family symmetry in which tree-level exchange of the second Higgs family
predicts $B_{s}$ and $B_{d}$ mixing and CP violation in good agreement with a
recent global fit, while naturally suppressing flavour and CP violation
involving the first and second quark and lepton families.Comment: 19 pages, 3 figures, references added, version to appear in JHE
|
Implications of large CP Violation in B mixing for Supersymmetric
Standard Models
|
implications of large cp violation in b mixing for supersymmetric standard models
|
anomalous dimuon asymmetry tevatron collider violation supersymmetric susy focussing unification. supersymmetric mssm violation expense squark models. violation susy transforming triplets symmetry. realistic delta predicts violation naturally suppressing flavour violation involving lepton pages
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non_dup
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[] |
2096526
|
10.1007/JHEP09(2010)115
|
In this paper we calculate the tree level three-point functions of Vasiliev's
higher spin gauge theory in AdS4 and find agreement with the correlators of the
free field theory of N massless scalars in three dimensions in the O(N) singlet
sector. This provides substantial evidence that Vasiliev theory is dual to the
free field theory, thus verifying a conjecture of Klebanov and Polyakov. We
also find agreement with the critical O(N) vector model, when the bulk scalar
field is subject to the alternative boundary condition such that its dual
operator has classical dimension 2.Comment: 90 pages, 5 figures; v4, minor changes in the introductio
|
Higher Spin Gauge Theory and Holography: The Three-Point Functions
|
higher spin gauge theory and holography: the three-point functions
|
vasiliev correlators massless scalars singlet sector. substantial vasiliev verifying conjecture klebanov polyakov. pages minor introductio
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non_dup
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[] |
2156975
|
10.1007/JHEP09(2011)003
|
Inspired by the string landscape and the unified gauge coupling relation in
the F-theory Grand Unified Theories (GUTs) and GUTs with suitable
high-dimensional operators, we study the canonical gauge coupling unification
and Higgs boson mass in the Standard Model (SM) with high-scale supersymmetry
breaking. In the SM with GUT-scale supersymmetry breaking, we achieve the gauge
coupling unification at about 5.3 x 10^{13} GeV, and the Higgs boson mass is
predicted to range from 130 GeV to 147 GeV. In the SM with supersymmetry
breaking scale from 10^4 GeV to 5.3 x 10^{13} GeV, gauge coupling unification
can always be realized and the corresponding GUT scale M_U is from 10^{16} GeV
to 5.3 x 10^{13} GeV, respectively. Also, we obtain the Higgs boson mass from
114.4 GeV to 147 GeV. Moreover, the discrepancies among the SM gauge couplings
at the GUT scale are less than about 4-6%. Furthermore, we present the SU(5)
and SO(10) models from the F-theory model building and orbifold constructions,
and show that we do not have the dimension-five and dimension-six proton decay
problems even if M_U \le 5 x 10^{15} GeV.Comment: RevTex4, 16 pages, 5 figures, version to appear in JHE
|
Canonical Gauge Coupling Unification in the Standard Model with
High-Scale Supersymmetry Breaking
|
canonical gauge coupling unification in the standard model with high-scale supersymmetry breaking
|
inspired landscape unified grand unified guts guts canonical unification boson supersymmetry breaking. supersymmetry breaking unification boson gev. supersymmetry breaking unification realized respectively. boson gev. discrepancies couplings orbifold constructions proton revtex pages
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[] |
2167418
|
10.1007/JHEP09(2011)004
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The Fateev-Zamolodchikov-Zamolodchikov (FZZ) duality relates Witten's cigar
model to sine-Liouville theory. This duality was proven in the path integral
formulation and extended to the case of higher genus closed Riemann surfaces by
Schomerus and one of the authors. In this note we further extend the duality to
the case with boundary. Specifically, we relate D1-branes in the cigar model to
D2-branes in the sine-Liouville theory. In particular, the boundary action for
D2-branes in the sine-Liouville theory is constructed. We also consider the
fermionic version of the FZZ duality. This duality was proven as a mirror
symmetry by Hori and Kapustin, but we give an alternative proof in the path
integral formulation which directly relates correlation functions. Also here
the case with boundary is investigated and the results are consistent with
those for branes in N=2 super Liouville field theory obtained by Hosomichi.Comment: 41 pages, 2 figures; v2: extended published versio
|
The FZZ duality with boundary
|
the fzz duality with boundary
|
fateev zamolodchikov zamolodchikov duality relates witten cigar sine liouville theory. duality proven formulation genus riemann schomerus authors. extend duality boundary. relate branes cigar branes sine liouville theory. branes sine liouville constructed. fermionic duality. duality proven mirror hori kapustin formulation relates functions. branes super liouville pages versio
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non_dup
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[] |
2194883
|
10.1007/JHEP09(2011)005
|
We study the quantum moduli space of N=2 Chern-Simons quivers with generic
ranks and CS levels, proving along the way exact formulas for the charges of
bare monopole operators. We then derive N=2 Chern-Simons quiver theories dual
to AdS_4 x Y^{p,q}(CP2) M-theory backgrounds, for the whole family of
Sasaki-Einstein seven-manifolds and for any value of the torsion G_4 flux. The
derivation of the gauge theories relies on the reduction to type IIA string
theory, in which M2-branes become D2-branes while the conical geometry maps to
RR flux and D6-branes wrapped on compact four-cycles. M5-branes on torsion
cycles map to flux and wrapped D4-branes. The moduli space of the quiver is
shown to contain the corresponding CY_4 cone and all its crepant resolutions.Comment: 49+20 pages, 6 figures; v2: typos fixed, references added, 49+21
page
|
Quantum moduli space of Chern-Simons quivers, wrapped D6-branes and
AdS4/CFT3
|
quantum moduli space of chern-simons quivers, wrapped d6-branes and ads4/cft3
|
moduli chern simons quivers generic ranks proving formulas charges bare monopole operators. derive chern simons quiver backgrounds sasaki einstein seven manifolds torsion flux. derivation relies branes branes conical branes wrapped cycles. branes torsion cycles wrapped branes. moduli quiver cone crepant pages typos
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non_dup
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2190997
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10.1007/JHEP09(2011)016
|
Warped scenarios offer an appealing solution to the hierarchy problem. We
consider a non-trivial deformation of the basic Randall-Sundrum framework that
has a KK-parity symmetry. This leads to a stable particle beyond the Standard
Model, that is generically expected to be the first KK-parity odd excitation of
the radion field. We consider the viability of the KK-radion as a DM candidate
in the context of thermal and non-thermal production in the early universe. In
the thermal case, the KK-radion can account for the observed DM density when
the radion decay constant is in the natural multi-TeV range. We also explore
the effects of coannihilations with the first KK excitation of the RH top, as
well as the effects of radion-Higgs mixing, which imply mixing between the
KK-radion and a KK-Higgs (both being KK-parity odd). The non-thermal scenario,
with a high radion decay constant, can also lead to a viable scenario provided
the reheat temperature and the radion decay constant take appropriate values,
although the reheat temperature should not be much higher than the TeV scale.
Direct detection is found to be feasible if the DM has a small (KK-parity odd)
Higgs admixture. Indirect detection via a photon signal from the galactic
center is an interesting possibility, while the positron and neutrino fluxes
from KK-radion annihilations are expected to be rather small. Colliders can
probe characteristic aspects of the DM sector of warped scenarios with
KK-parity, such as the degeneracy between the radion and the KK-radion (DM)
modes.Comment: 43 pages, 16 figures; added reference
|
Warped Radion Dark Matter
|
warped radion dark matter
|
warped scenarios offer appealing hierarchy problem. trivial deformation randall sundrum parity symmetry. generically parity radion field. viability radion candidate universe. radion radion range. explore coannihilations radion imply radion parity radion viable reheat radion reheat scale. feasible parity admixture. indirect galactic positron fluxes radion annihilations small. colliders warped scenarios parity degeneracy radion radion pages
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2188125
|
10.1007/JHEP09(2011)019
|
We investigate mass deformation of twisted superalgebra of U(N) super
Yang-Mills (SYM) theories in several models and in several dimensions,
motivated by the method formulated in [1]. We show that there are several ways
to perform the deformation, if a model possesses four scalar supercharges
except for two dimensional B-model. We also evaluate classical vacuum solutions
of the potentials of scalar fields for each model. We then find that it is
always possible to find fuzzy sphere solution in the theories.Comment: 30 pages. One paragraph changed in the introduction and some
references adde
|
Mass deformation of twisted super Yang-Mills theory with fuzzy sphere
solution
|
mass deformation of twisted super yang-mills theory with fuzzy sphere solution
|
deformation twisted superalgebra super mills motivated formulated ways deformation possesses supercharges model. potentials model. fuzzy sphere pages. paragraph changed adde
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non_dup
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2191595
|
10.1007/JHEP09(2011)020
|
The geometric description of D-branes in WZW models is pushed forward. Our
starting point is a gluing condition\, $J_{+}=FJ_-$ that matches the model's
chiral currents at the worldsheet boundary through a linear map $F$ acting on
the WZW Lie algebra. The equivalence of boundary and gluing conditions of this
type is studied in detail. The analysis involves a thorough discussion of
Frobenius integrability, shows that $F$ must be an isometry, and applies to
both metrically degenerate and nondegenerate D-branes. The isometry $F$ need
not be a Lie algebra automorphism nor constantly defined over the brane. This
approach, when applied to isometries of the form $F=R$ with $R$ a constant Lie
algebra automorphism, validates metrically degenerate $R$-twined conjugacy
classes as D-branes. It also shows that no D-branes exist in semisimple WZW
models for constant\, $F=-R$.Comment: 23 pages, discussion of limitations of the gluing condition approach
adde
|
Geometric construction of D-branes in WZW models
|
geometric construction of d-branes in wzw models
|
geometric branes pushed forward. gluing matches chiral currents worldsheet acting algebra. equivalence gluing detail. involves thorough frobenius integrability isometry applies metrically degenerate nondegenerate branes. isometry automorphism constantly brane. isometries automorphism validates metrically degenerate twined conjugacy branes. branes semisimple .comment pages limitations gluing adde
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non_dup
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[] |
2189916
|
10.1007/JHEP09(2011)023
|
A particle in four dimensions should behave like a classical black hole if
the horizon radius is larger than the Compton wavelength or, equivalently, if
its degeneracy (measured by entropy in units of the Planck scale) is large. For
spherically symmetric black holes in 4 + d dimensions, both arguments again
lead to a mass threshold MC and degeneracy scale Mdeg of the order of the
fundamental scale of gravity MG. In the brane-world, deviations from the
Schwarzschild metric induced by bulk effects alter the horizon radius and
effective four-dimensional Euclidean action in such a way that MC \simeq Mdeg
might be either larger or smaller than MG. This opens up the possibility that
black holes exist with a mass smaller than MG and might be produced at the LHC
even if M>10 TeV, whereas effects due to bulk graviton exchanges remain
undetectable because suppressed by inverse powers of MG. Conversely, even if
black holes are not found at the LHC, it is still possible that MC>MG and MG
\simeq 1TeV.Comment: 4 pages, no figur
|
Brane-world black holes and the scale of gravity
|
brane-world black holes and the scale of gravity
|
behave horizon compton equivalently degeneracy planck large. spherically holes arguments degeneracy mdeg brane deviations schwarzschild alter horizon euclidean simeq mdeg opens holes graviton exchanges undetectable suppressed powers conversely holes simeq pages figur
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non_dup
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2191017
|
10.1007/JHEP09(2011)024
|
Using flavor SU(3) symmetry, we perform a model-independent analysis of
charmless $\bar B_{u,d} (\bar B_s) \to PP, ~PV$ decays. All the relevant
topological diagrams, including the presumably subleading diagrams, such as the
QCD- and EW-penguin exchange diagrams and flavor-singlet weak annihilation
ones, are introduced. Indeed, the QCD-penguin exchange diagram turns out to be
important in understanding the data for penguin-dominated decay modes. In this
work we make efforts to bridge the (model-independent but less quantitative)
topological diagram or flavor SU(3) approach and the (quantitative but somewhat
model-dependent) QCD factorization (QCDF) approach in these decays, by
explicitly showing how to translate each flavor SU(3) amplitude into the
corresponding terms in the QCDF framework. After estimating each flavor SU(3)
amplitude numerically using QCDF, we discuss various physical consequences,
including SU(3) breaking effects and some useful SU(3) relations among decay
amplitudes of $\bar B_s \to PV$ and $\bar B_d \to PV$.Comment: 47 pages, 3 figures, 28 table
|
Flavor SU(3) symmetry and QCD factorization in $B \to PP$ and $PV$
decays
|
flavor su(3) symmetry and qcd factorization in $b \to pp$ and $pv$ decays
|
flavor charmless decays. topological diagrams presumably subleading diagrams penguin diagrams flavor singlet annihilation introduced. penguin turns penguin dominated modes. efforts bridge topological flavor somewhat factorization qcdf decays explicitly translate flavor qcdf framework. estimating flavor numerically qcdf consequences breaking amplitudes .comment pages
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non_dup
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[] |
2150700
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10.1007/JHEP09(2011)026
|
Recently, Dymarsky, Kuperstein and Sonnenschein constructed an embedding of
flavor D7- and anti-D7-branes in the Klebanov-Strassler geometry that breaks
the supersymmetry of the background, yet is stable. In this article, we study
in detail the spectrum of vector mesons in this new model of flavor chiral
symmetry breaking and commence an analytical analysis of the scalar mesons in
this setup.Comment: v1: 35 pages, 5 figures, 4 tables, includes self-contained review of
DKS construction; v2: corrected signs in eqs. (2.22) and (2.23), improved
discussion of scalar mesons in section 3.2; v3: major revision of the results
on scalar mesons, version submitted to JHEP; v4: version accepted by JHE
|
Scalar and vector mesons of flavor chiral symmetry breaking in the
Klebanov-Strassler background
|
scalar and vector mesons of flavor chiral symmetry breaking in the klebanov-strassler background
|
dymarsky kuperstein sonnenschein embedding flavor branes klebanov strassler breaks supersymmetry stable. mesons flavor chiral breaking commence mesons pages tables corrected signs eqs. mesons revision mesons submitted jhep
|
non_dup
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[] |
2153968
|
10.1007/JHEP09(2011)027
|
Supersymmetric monojets may be produced at the Large Hadron Collider by the
process qg -> squark neutralino_1 -> q neutralino_1 neutralino_1, leading to a
jet recoiling against missing transverse momentum. We discuss the feasibility
and utility of the supersymmetric monojet signal. In particular, we examine the
possible precision with which one can ascertain the neutralino_1-squark-quark
coupling via the rate for monojet events. Such a coupling contains information
on the composition of the neutralino_1 and helps bound dark matter direct
detection cross-sections and the dark matter relic density of the neutralino_1.
It also provides a check of the supersymmetric relation between gauge couplings
and gaugino-quark-squark couplings.Comment: 46 pages, 10 figures. The appendix has been rewritten to correct an
error that appears in all previous versions of the appendix. This error has
no effect on the results in the main body of the pape
|
Supersymmetric Monojets at the Large Hadron Collider
|
supersymmetric monojets at the large hadron collider
|
supersymmetric monojets hadron collider squark neutralino neutralino neutralino recoiling missing momentum. feasibility utility supersymmetric monojet signal. examine precision ascertain neutralino squark monojet events. neutralino helps relic neutralino check supersymmetric couplings gaugino squark pages figures. rewritten versions appendix. pape
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non_dup
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[] |
2192374
|
10.1007/JHEP09(2011)029
|
We compute three-point functions of single trace operators in planar N=4 SYM.
We consider the limit where one of the operators is much smaller than the other
two. We find a precise match between weak and strong coupling in the
Frolov-Tseytlin classical limit for a very general class of classical
solutions. To achieve this match we clarify the issue of back-reaction and
identify precisely which three-point functions are captured by a classical
computation.Comment: 36 pages. v2: figure added, references adde
|
Tailoring Three-Point Functions and Integrability II. Weak/strong
coupling match
|
tailoring three-point functions and integrability ii. weak/strong coupling match
|
trace planar sym. two. precise match frolov tseytlin solutions. match clarify precisely captured pages. adde
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non_dup
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[] |
2179656
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10.1007/JHEP09(2011)031
|
We present an on-shell formalism for superamplitudes of pure N<4 super
Yang-Mills theory. Two superfields, Phi and Phi^+, are required to describe the
two CPT conjugate supermultiplets. Simple truncation prescriptions allow us to
derive explicit tree-level MHV and NMHV superamplitudes with N-fold SUSY. Any
N=0,1,2 tree superamplitudes have large-z falloffs under super-BCFW shifts,
except under [Phi,Phi^+>-shifts. We show that this `bad' shift is responsible
for the bubble contributions to 1-loop amplitudes in N=0,1,2 SYM. We evaluate
the MHV bubble coefficients in a manifestly supersymmetric form and demonstrate
for the case of four external particles that the sum of bubble coefficients is
equal to minus the tree superamplitude times the 1-loop beta-function
coefficient. The connection to the beta-function is expected since only bubble
integrals capture UV divergences; we discuss briefly how the minus sign arises
from UV and IR divergences in dimensional regularization. Other applications of
the on-shell formalism include a solution to the N^{K}MHV N=1 SUSY Ward
identities and a clear description of the connection between 6d superamplitudes
and the 4d ones for both N=4 and N=2 SYM. We outline extensions to N<8
supergravity.Comment: 37 pages, 4 figure
|
On-shell superamplitudes in N<4 SYM
|
on-shell superamplitudes in n<4 sym
|
formalism superamplitudes super mills theory. superfields conjugate supermultiplets. truncation prescriptions derive nmhv superamplitudes susy. superamplitudes falloffs super bcfw shifts shifts. bubble amplitudes sym. bubble manifestly supersymmetric bubble minus superamplitude beta coefficient. connection beta bubble integrals capture divergences briefly minus arises divergences regularization. formalism susy ward identities connection superamplitudes sym. outline extensions pages
|
non_dup
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[] |
2092042
|
10.1007/JHEP09(2011)032
|
Motivated by the computation of scattering amplitudes at strong coupling, we
consider minimal area surfaces in AdS_5 which end on a null polygonal contour
at the boundary. We map the classical problem of finding the surface into an
SU(4) Hitchin system. The polygon with six edges is the first non-trivial
example. For this case, we write an integral equation which determines the area
as a function of the shape of the polygon. The equations are identical to those
of the Thermodynamics Bethe Ansatz. Moreover, the area is given by the free
energy of this TBA system. The high temperature limit of the TBA system can be
exactly solved. It leads to an explicit expression for a special class of
hexagonal contours.Comment: 55 pages, 22 figures. v2: references added, V3: small typo fixe
|
Thermodynamic Bubble Ansatz
|
thermodynamic bubble ansatz
|
motivated amplitudes polygonal contour boundary. hitchin system. polygon trivial example. determines polygon. thermodynamics bethe ansatz. system. solved. hexagonal pages figures. typo fixe
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non_dup
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[] |
2189894
|
10.1007/JHEP09(2011)040
|
We prove a duality, recently conjectured in arXiv:1103.5726, which relates
the F-terms of supersymmetric gauge theories defined in two and four dimensions
respectively. The proof proceeds by a saddle point analysis of the
four-dimensional partition function in the Nekrasov-Shatashvili limit. At
special quantized values of the Coulomb branch moduli, the saddle point
condition becomes the Bethe Ansatz Equation of the SL(2) Heisenberg spin chain
which coincides with the F-term equation of the dual two-dimensional theory.
The on-shell values of the superpotential in the two theories are shown to
coincide in corresponding vacua. We also identify two-dimensional duals for a
large set of quiver gauge theories in four dimensions and generalize our proof
to these cases.Comment: 19 pages, 2 figures, minor corrections and references adde
|
A New 2d/4d Duality via Integrability
|
a new 2d/4d duality via integrability
|
duality conjectured relates supersymmetric respectively. proceeds saddle partition nekrasov shatashvili limit. quantized coulomb branch moduli saddle bethe ansatz heisenberg coincides theory. superpotential coincide vacua. duals quiver generalize pages minor adde
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non_dup
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[] |
2185976
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10.1007/JHEP09(2011)041
|
By solving the Einstein equations of the graviton coupling with a real scalar
dilaton field, we establish a general framework to self-consistently solve the
geometric background with black-hole for any given phenomenological holographic
models. In this framwork, we solve the black-hole background, the corresponding
dilaon field and the dilaton potential for the deformed AdS$_5$ model with a
positive/negative quadratic correction. We systematically investigate the
thermodynamical properties of the deformed AdS$_5$ model with a positive and
negative quadratic correction, respectively, and compare with lattice QCD on
the results of the equation of state, the heavy quark potential, the Polyakov
loop and the spatial Wilson loop. We find that the bulk thermodynamical
properties are not sensitive to the sign of the quadratic correction, and the
results of both deformed holographic QCD models agree well with lattice QCD
result for pure SU(3) gauge theory. However, the results from loop operators
favor a positive quadratic correction, which agree well with lattice QCD
result. Especially, the result from the Polyakov loop excludes the model with a
negative quadratic correction in the warp factor of ${\rm AdS}_5$.Comment: 26 figures,36 pages,V.3: an appendix,more equations and references
added,figures corrected,published versio
|
Thermodynamics of deformed AdS$_5$ model with a positive/negative
quadratic correction in graviton-dilaton system
|
thermodynamics of deformed ads$_5$ model with a positive/negative quadratic correction in graviton-dilaton system
|
solving einstein graviton dilaton establish consistently solve geometric phenomenological holographic models. framwork solve dilaon dilaton deformed quadratic correction. systematically thermodynamical deformed quadratic polyakov wilson loop. thermodynamical quadratic deformed holographic agree theory. favor quadratic agree result. polyakov excludes quadratic warp .comment pages corrected versio
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non_dup
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[] |
2189719
|
10.1007/JHEP09(2011)045
|
We consider the most general three point function for gravitational waves
produced during a period of exactly de Sitter expansion. The de Sitter
isometries constrain the possible shapes to only three: two preserving parity
and one violating parity. These isometries imply that these correlation
functions should be conformal invariant. One of the shapes is produced by the
ordinary gravity action. The other shape is produced by a higher derivative
correction and could be as large as the gravity contribution. The parity
violating shape does not contribute to the bispectrum [1106.3228, 1108.0175],
even though it is present in the wavefunction. We also introduce a spinor
helicity formalism to describe de Sitter gravitational waves with circular
polarization. These results also apply to correlation functions in Anti-de
Sitter space. They also describe the general form of stress tensor correlation
functions, in momentum space, in a three dimensional conformal field theory.
Here all three shapes can arise, including the parity violating one.Comment: 51 pages, v2: Corrected statement about parity violation in the
gravitational wave bispectrum. Some other changes and references adde
|
On graviton non-Gaussianities during inflation
|
on graviton non-gaussianities during inflation
|
gravitational sitter expansion. sitter isometries constrain shapes preserving parity violating parity. isometries imply conformal invariant. shapes ordinary action. contribution. parity violating bispectrum wavefunction. spinor helicity formalism sitter gravitational circular polarization. sitter space. conformal theory. shapes arise parity violating pages corrected statement parity violation gravitational bispectrum. adde
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non_dup
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[] |
2189781
|
10.1007/JHEP09(2011)047
|
We classify under some assumptions the IIB black hole horizons with 5-form
flux preserving more than 2 supersymmetries. We find that the spatial horizon
sections with non-vanishing flux preserving 4 supersymmetries are locally
isometric either to S^1 * S^3 * T^4 or to S^1 * S^3 * K_3 and the associated
near horizon geometries are locally isometric to AdS_3 * S^3 * T^4 and AdS_3 *
S^3 * K_3$, respectively. The near horizon geometries preserving more than 4
supersymmetries are locally isometric to R^{1,1} * T^8.Comment: 16 pages, latex. Minor typos correcte
|
IIB black hole horizons with five-form flux and extended supersymmetry
|
iib black hole horizons with five-form flux and extended supersymmetry
|
classify assumptions horizons preserving supersymmetries. horizon vanishing preserving supersymmetries locally isometric horizon geometries locally isometric respectively. horizon geometries preserving supersymmetries locally isometric pages latex. minor typos correcte
|
non_dup
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2188916
|
10.1007/JHEP09(2011)049
|
Top-antitop pairs produced in the decay of a new heavy resonance will exhibit
spin correlations that contain valuable coupling information. When the tops
decay, these correlations imprint themselves on the angular patterns of the
final quarks and leptons. While many approaches to the measurement of top spin
correlations are known, the most common ones require detailed kinematic
reconstructions and are insensitive to some important spin interference
effects. In particular, spin-1 resonances with mostly-vector or mostly-axial
couplings to top cannot be easily discriminated from one another without
appealing to mass-suppressed effects or to more model-dependent interference
with continuum Standard Model production. Here, we propose to probe the
structure of a resonance's couplings to tops by measuring the azimuthal angles
of the tops' decay products about the production axis. These angles exhibit
modulations which are typically O(0.1-1), and which by themselves allow for
discrimination of spin-0 from higher spins, measurement of the CP-phase for
spin-0, and measurement of the vector/axial composition for spins 1 and 2. For
relativistic tops, the azimuthal decay angles can be well-approximated without
detailed knowledge of the tops' velocities, and appear to be robust against
imperfect energy measurements and neutrino reconstructions. We illustrate this
point in the highly challenging dileptonic decay mode, which also exhibits the
largest modulations. We comment on the relevance of these observables for
testing axigluon-like models that explain the top quark A_FB anomaly at the
Tevatron, through direct production at the LHC.Comment: 24 pages plus appendices, 6 figures. v2: added references, updated
AFB model, expanded discussion of SM interference for spin-0 particl
|
Discriminating Top-Antitop Resonances using Azimuthal Decay Correlations
|
discriminating top-antitop resonances using azimuthal decay correlations
|
antitop exhibit valuable information. tops imprint quarks leptons. kinematic reconstructions insensitive interference effects. resonances mostly mostly axial couplings discriminated appealing suppressed interference continuum production. propose couplings tops measuring azimuthal angles tops axis. angles exhibit modulations discrimination spins axial spins relativistic tops azimuthal angles approximated tops velocities robust imperfect reconstructions. illustrate challenging dileptonic exhibits modulations. comment relevance observables axigluon anomaly tevatron pages appendices figures. updated expanded interference particl
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non_dup
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[] |
2158917
|
10.1007/JHEP09(2011)054
|
We consider the noncommutative deformation of the Sakai--Sugimoto model at
finite temperature and finite baryon chemical potential. The space
noncommutativity is possible to have an influence on the flavor dynamics of the
QCD. The critical temperature and critical value of the chemical potential are
modified by the space noncommutativity. The influence of the space
noncommutativity on the flavor dynamics of the QCD is caused by the
Wess--Zumino term in the effective action of the D8-branes. The intermediate
temperature phase, in which the gluons deconfine but the chiral symmetry
remains broken, is easy to be realized in some region of the noncommutativity
parameter.Comment: 20 pages, 8 figures; v2: minor corrections and improvements,
conclusions unchanged; v3: minor corrections, version accepted for
publication in JHE
|
Chiral Symmetry Restoration in Holographic Noncommutative QCD
|
chiral symmetry restoration in holographic noncommutative qcd
|
noncommutative deformation sakai sugimoto baryon potential. noncommutativity flavor qcd. noncommutativity. noncommutativity flavor wess zumino branes. gluons deconfine chiral broken realized noncommutativity pages minor improvements unchanged minor publication
|
non_dup
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[] |
11285076
|
10.1007/JHEP09(2011)061
|
We present a study of ell ν bbar{b} and {ell+ }{ell- }bbar{b} production at hadron colliders. Our results, accurate to the next-to-leading order in QCD, are based on automatic matrix-element calculations performed by M adLoop and M adFKS, and are given at both the parton level, and after the matching with the H erwig event generator, achieved with aMC@NLO. We retain the complete dependence on the bottom-quark mass, and include exactly all spin correlations of final-state leptons. We discuss the cases of several observables at the LHC which highlight the importance of accurate simulations
|
W and Z/γ∗ boson production in association with a bottom-antibottom pair
|
w and z/γ∗ boson production in association with a bottom-antibottom pair
|
bbar bbar hadron colliders. automatic adloop adfks parton matching erwig generator nlo. retain leptons. observables highlight
|
non_dup
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[] |
2192973
|
10.1007/JHEP09(2011)062
|
We consider charged black holes in Einstein-Gauss-Bonnet Gravity with
Lifshitz boundary conditions. We find that this class of models can reproduce
the anomalous specific heat of condensed matter systems exhibiting
non-Fermi-liquid behaviour at low temperatures. We find that the temperature
dependence of the Sommerfeld ratio is sensitive to the choice of Gauss-Bonnet
coupling parameter for a given value of the Lifshitz scaling parameter. We
propose that this class of models is dual to a class of models of
non-Fermi-liquid systems proposed by Castro-Neto et.al.Comment: 17 pages, 6 figures, pdfLatex; small corrections to figure 10 in this
versio
|
Gauss-Bonnet Black Holes and Heavy Fermion Metals
|
gauss-bonnet black holes and heavy fermion metals
|
holes einstein gauss bonnet lifshitz conditions. reproduce anomalous condensed exhibiting fermi temperatures. sommerfeld gauss bonnet lifshitz parameter. propose fermi castro neto pages pdflatex versio
|
non_dup
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[] |
60621815
|
10.1007/JHEP09(2011)072
|
Artículo escrito por un elevado número de autores, solo se referencian el que aparece en primer lugar, el nombre del grupo de colaboración, si le hubiere, y los autores pertenecientes a la UAMJournal of High Energy Physics 2011.9 (2011): 072 reproduced by permission of Scuola Internazionale Superiore di Studi Avanzati (SISSA)We present studies of W and Z bosons with associated high energy photons produced in pp collisions at √s = 7TeV. The analysis uses 35 pb -1 of data collected by the ATLAS experiment in 2010. The event selection requires W and Z bosons decaying into high pT leptons (electrons or muons) and a photon with ET > 15 GeV separated from the lepton(s) by a distance ΔR(l, γ ) > 0.7 in η-φ space. A total of 95 (97) pp → e±vy + X (pp →μ± νγ + X) and 25 (23) pp → e+e-γ + X (pp → μ+μ -γ + X) event candidates are selected. The kinematic distributions of the leptons and photons and the production cross sections are measured. The data are found to agree with Standard Model predictions that include next-to-leading-order O(ααs) contribution
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Measurement of Wγ and Zγ production in proton-proton collisions at √s = 7 TeV with the ATLAS detector
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measurement of wγ and zγ production in proton-proton collisions at √s = 7 tev with the atlas detector
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artículo escrito elevado número autores solo referencian aparece primer lugar nombre grupo colaboración hubiere autores pertenecientes uamjournal reproduced permission scuola internazionale superiore studi avanzati sissa bosons photons collisions tev. atlas bosons decaying leptons muons separated lepton space. e±vy candidates selected. kinematic leptons photons measured. agree
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2194368
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10.1007/JHEP09(2011)075
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We analyze theoretical constraints on the consistency of brane inflation
leading to cosmic superstring formation and on the subsequent radiation of
these cosmic superstrings. We first investigate the implications of recently
elucidated supergravity constraints on models of brane inflation. We show that
both D3/D7 and D3/anti-D3 brane inflation are subject to non-trivial
constraints. Both models can be shown to satisfy those constraints, but for the
case of D3/D7 there may be important consequences for the inflationary
mechanism. We then analyze the strong theoretical constraints on the types of
allowed radiation by cosmic superstrings, should they be formed; such
constraints do not apply to their field theoretical analogues. We argue that in
a warped background where one might expect axionic radiation to be enhanced
relative to gravitational radiation, neithe F-strings nor D-strings can emit
axionic radiation, while FD-strings cannot give rise to
Neveu-Schwarz--Neveu-Schwarz particle emission, and their Ramond-Ramond
particle emission is not well-defined.Comment: 26 pages. v3: Minor corrections: footnote and reference added, and
minor argument clarifie
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Theoretical constraints on brane inflation and cosmic superstring
radiation
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theoretical constraints on brane inflation and cosmic superstring radiation
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analyze consistency brane inflation cosmic superstring cosmic superstrings. elucidated supergravity brane inflation. brane inflation trivial constraints. satisfy consequences inflationary mechanism. analyze cosmic superstrings analogues. argue warped axionic gravitational neithe strings strings emit axionic strings neveu schwarz neveu schwarz ramond ramond pages. minor footnote minor argument clarifie
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non_dup
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2156414
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10.1007/JHEP09(2011)076
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Looking for a quantum field theory model of Archimedean algebraic geometry a
class of infinite-dimensional integral representations of classical special
functions was introduced. Precisely the special functions such as Whittaker
functions and Gamma-function were identified with correlation functions in
topological field theories on a two-dimensional disk. Mirror symmetry of the
underlying topological field theory leads to a dual finite-dimensional integral
representations reproducing classical integral representations for the
corresponding special functions. The mirror symmetry interchanging infinite-
and finite-dimensional integral representations provides an incarnation of the
local Archimedean Langlands duality on the level of classical special
functions. In this note we provide some directions to higher-dimensional
generalizations of our previous results. In the first part we consider
topological field theory representations of multiple local L-factors introduced
by Kurokawa and expressed through multiple Barnes's Gamma-functions. In the
second part we are dealing with generalizations based on consideration of
topological Yang-Mills theories on non-compact four-dimensional manifolds.
Presumably, in analogy with the mirror duality in two-dimensions, S-dual
description should be instrumental for deriving integral representations for a
particular class of quantum field theory correlation functions and thus
providing a new interesting class of special functions supplied with canonical
integral representations.Comment: 21 pages, typos are fixed and important reference is adde
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On topological field theory representation of higher analogs of
classical special functions
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on topological field theory representation of higher analogs of classical special functions
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looking archimedean algebraic infinite representations introduced. precisely whittaker gamma topological disk. mirror topological representations reproducing representations functions. mirror interchanging infinite representations incarnation archimedean langlands duality functions. directions generalizations results. topological representations kurokawa barnes gamma functions. dealing generalizations consideration topological mills manifolds. presumably analogy mirror duality instrumental deriving representations supplied canonical pages typos adde
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non_dup
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2187579
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10.1007/JHEP09(2011)078
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As was observed by Grigoriev and Tseytlin, the Pohlmeyer-reduced AdS_2 x S^2
superstring theory possesses N=(2,2) worldsheet supersymmetry. We show, at the
classical level, that the AdS_3 x S^3 and AdS_5 x S^5 superstring theories in
the Pohlmeyer-reduced form reveal hidden N=(4,4) and N=(8,8) worldsheet
supersymmetries. Our consideration is based on the modified mass-deformed
gauged WZW action for the superstring equations. We present the explicit form
of the supersymmetry transformations for both the off-shell action and the
superstring equations. The characteristic feature of these transformations is
the presence of non-local terms.Comment: 1+18 pages, minor corrections, published versio
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Worldsheet Supersymmetry of Pohlmeyer-Reduced AdS_n x S^n Superstrings
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worldsheet supersymmetry of pohlmeyer-reduced ads_n x s^n superstrings
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grigoriev tseytlin pohlmeyer superstring possesses worldsheet supersymmetry. superstring pohlmeyer reveal hidden worldsheet supersymmetries. consideration deformed gauged superstring equations. supersymmetry transformations superstring equations. transformations pages minor versio
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non_dup
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2182902
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10.1007/JHEP09(2011)087
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We extend the work of Aarts et al., including an imaginary chemical potential
for quark number into the Sakai-Sugimoto model and codimension k defect
theories. The phase diagram of these models are a function of three parameters,
the temperature, chemical potential and the asymptotic separation of the
flavour branes, related to a mass for the quarks in the boundary theories. We
compute the phase diagrams and the pressure due to the flavours of the theories
as a function of these parameters and show that there are Roberge-Weiss
transitions in the high temperature phases, chiral symmetry restored for the
Sakai-Sugimoto model and deconfined for the defect models, while at low
temperatures there are no Roberge-Weiss transitions. In all the models we
consider the transitions between low and high temperature phases are first
order, hence the points where they meet the Roberge-Weiss lines are triple
points. The pressure for the defect theories scales in the way we expect from
dimensional analysis while the Sakai-Sugimoto model exhibits unusual scaling.
We show that the models we consider are analytic in \mu^2 when \mu^2 is small.Comment: 39 pages, 12 figures. references added, Sakai-Sugimoto section
revised, version to appear in JHE
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Holographic Roberge-Weiss Transitions II: Defect Theories and the
Sakai-Sugimoto Model
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holographic roberge-weiss transitions ii: defect theories and the sakai-sugimoto model
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extend aarts imaginary sakai sugimoto codimension defect theories. asymptotic flavour branes quarks theories. diagrams flavours roberge weiss chiral restored sakai sugimoto deconfined defect roberge weiss transitions. meet roberge weiss triple points. defect sakai sugimoto exhibits unusual scaling. analytic pages figures. sakai sugimoto revised
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non_dup
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2143227
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10.1007/JHEP09(2011)094
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We propose a new technique for determining the spin of new massive particles
that might be discovered at the Large Hadron Collider. The method relies on
pair-production of the new particles in a kinematic regime where the vector
boson fusion production mechanism is enhanced. For this regime, we show that
the distribution of the leading jets as a function of their relative azimuthal
angle can be used to distinguish spin-0 from spin-1/2 particles. We illustrate
this effect by considering the particular cases of (i) strongly-interacting,
stable particles and (ii) supersymmetric particles carrying color charge. We
argue that this method should be applicable in a wide range of new physics
scenarios.Comment: 5 pages, 4 figure
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Diagnosing Spin at the LHC via Vector Boson Fusion
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diagnosing spin at the lhc via vector boson fusion
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propose determining massive discovered hadron collider. relies kinematic boson fusion enhanced. jets azimuthal distinguish particles. illustrate interacting supersymmetric carrying charge. argue applicable pages
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non_dup
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2188931
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10.1007/JHEP09(2011)095
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Recently Eling and Oz (EO) proposed a formula for the holographic bulk
viscosity, in arXiv:1103.1657, derived from the null horizon focusing equation.
This formula seems different from that obtained earlier by Gubser, Pufu and
Rocha (GPR) in arXiv:0806.0407 calculated from the IR limit of the two-point
function of the trace of the stress tensor. The two were shown to agree only
for some simple scaling cases. We point out that the two formulae agree in two
non-trivial holographic theories describing RG flows. The first is the strongly
coupled N=2* gauge theory plasma. The second is the semi-phenomenological model
of Improved Holographic QCD.Comment: 21 pages, 2 figure
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Holographic bulk viscosity: GPR vs EO
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holographic bulk viscosity: gpr vs eo
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eling holographic viscosity horizon focusing equation. gubser pufu rocha trace tensor. agree cases. formulae agree trivial holographic describing flows. plasma. phenomenological holographic pages
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non_dup
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2184090
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10.1007/JHEP09(2011)099
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A pair of new colored particles produced near the threshold can form a bound
state and then annihilate into standard model particles. In this paper we show
how the bound state signals can distinguish between two scenarios that have
similar particle content and interactions but different spins, such as the
minimal supersymmetric standard model (MSSM) and universal extra dimensions
(UED). We find, for example, that bound states of KK gluons (KK gluonia) have
an order of magnitude larger cross sections than gluinonia and they may be
detectable as resonances in the $b\bar b$, $t\bar t$ or $\gamma\gamma$ channels
if the KK gluon is very light and sufficiently long-lived. KK gluonia can be
distinguished from gluinonia by their much larger cross sections and distinct
angular distributions. Similarly, KK quarkonia can be distinguished from
squarkonia by the size of their diphoton cross section and by their dilepton
signals. Since many of our results are largely determined by gauge
interactions, they will be useful for many other new physics scenarios as well.Comment: 42 pages, 20 figures; v2: added minor clarifications and references;
published versio
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Distinguishing spins at the LHC using bound state signals
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distinguishing spins at the lhc using bound state signals
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colored annihilate particles. distinguish scenarios spins supersymmetric mssm universal extra gluons gluonia gluinonia detectable resonances gamma gamma gluon sufficiently lived. gluonia distinguished gluinonia distributions. quarkonia distinguished squarkonia diphoton dilepton signals. largely scenarios pages minor clarifications versio
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non_dup
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2185117
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10.1007/JHEP09(2011)101
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We give a superspace description of D=3, N=8 supergravity. The formulation is
off-shell in the sense that the equations of motion are not implied by the
superspace constraints (but an action principle is not given). The multiplet
structure is unconventional, which we connect to the existence of a "Dragon
window", that is modules occurring in the supercurvature but not in the
supertorsion. According to Dragon's theorem this cannot happen above three
dimensions. We clarify the relevance of this window for going on the conformal
shell, and discuss some aspects of coupling to conformal matter.Comment: plain tex, 24 pp v2: minor change
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D=3, N=8 conformal supergravity and the Dragon window
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d=3, n=8 conformal supergravity and the dragon window
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superspace supergravity. formulation implied superspace multiplet unconventional connect dragon window modules occurring supercurvature supertorsion. dragon happen dimensions. clarify relevance window going conformal conformal plain minor
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non_dup
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84457295
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10.1007/JHEP09(2011)103
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We present a unified eight-dimensional approach to instanton equations on several seven-dimensional manifolds associated to a six-dimensional homogeneous nearly Kahler manifold. The cone over the sine-cone on a nearly Kahler manifold has holonomy group Spin(7) and can be foliated by submanifolds with either holonomy group G(2), a nearly parallel G(2)-structure or a cocalibrated G(2)-structure. We show that there is a G(2)-instanton on each of these seven-dimensional manifolds which gives rise to a Spin(7)-instanton in eight dimensions. The well-known octonionic instantons on R-7 and R-8 are contained in our construction as the special cases of an instanton on the cone and on the cone over the sine-cone, both over the six-sphere, respectively
|
Yang-Mills instantons on cones and sine-cones over nearly Kahler manifolds
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yang-mills instantons on cones and sine-cones over nearly kahler manifolds
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unified eight instanton seven manifolds homogeneous nearly kahler manifold. cone sine cone nearly kahler manifold holonomy foliated submanifolds holonomy nearly cocalibrated structure. instanton seven manifolds instanton eight dimensions. octonionic instantons instanton cone cone sine cone sphere
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non_dup
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2160744
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10.1007/JHEP09(2011)122
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We analyze orbifolds with discrete torsion of the ABJM theory by a finite
subgroup $\Gamma$ of $SU(2)\times SU(2)$ . Discrete torsion is implemented by
twisting the crossed product algebra resulting after orbifolding. It is shown
that, in general, the order $m$ of the cocycle we chose to twist the algebra by
enters in a non trivial way in the moduli space. To be precise, the M-theory
fiber is multiplied by a factor of $m$ in addition to the other effects that
were found before in the literature. Therefore we got a
$\mathbb{Z}_{\frac{k|\Gamma|}{m}}$ action on the fiber. We present a general
analysis on how this quotient arises along with a detailed analysis of the
cases where $\Gamma$ is abelian
|
Aspects of ABJM orbifolds with discrete torsion
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aspects of abjm orbifolds with discrete torsion
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analyze orbifolds torsion abjm subgroup gamma torsion implemented twisting crossed orbifolding. cocycle chose twist enters trivial moduli space. precise fiber multiplied literature. mathbb frac gamma fiber. quotient arises gamma abelian
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non_dup
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2135798
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10.1007/JHEP09(2011)123
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We start with an n-point correlation function in a conformal gauge theory. We
show that a special limit produces a polygonal Wilson loop with $n$ sides. The
limit takes the $n$ points towards the vertices of a null polygonal Wilson loop
such that successive distances $x^2_{i,i+1} \to 0$. This produces a fast moving
particle that generates a "frame" for the Wilson loop. We explain in detail how
the limit is approached, including some subtle effects from the propagation of
a fast moving particle in the full interacting theory. We perform perturbative
checks by doing explicit computations in N=4 super-Yang-Mills.Comment: 37 pages, 10 figures; typos corrected, references adde
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From correlation functions to Wilson loops
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from correlation functions to wilson loops
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conformal theory. produces polygonal wilson sides. polygonal wilson successive distances produces moving generates wilson loop. approached subtle propagation moving interacting theory. perturbative checks computations super pages typos corrected adde
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non_dup
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2191355
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10.1007/JHEP09(2011)133
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A relation between the 4d superconformal index and the S^3 partition function
is studied with focus on the 4d and 3d actions used in localization. In the
case of vanishing Chern-Simons levels and round S^3 we explicitly show that the
3d action is obtained from the 4d action by dimensional reduction up to terms
which do not affect the exact results. By combining this fact and a recent
proposal concerning a squashing of S^3 and SU(2) Wilson line, we obtain a
formula which gives the partition function depending on the Weyl weight of
chiral multiplets, real mass parameters, FI parameters, and a squashing
parameter as a limit of the index of a parent 4d theory.Comment: 20 pages, LaTeX; v2: comments added; v3: minor corrections, version
published in JHE
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Relation between the 4d superconformal index and the S^3 partition
function
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relation between the 4d superconformal index and the s^3 partition function
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superconformal partition localization. vanishing chern simons round explicitly results. combining proposal concerning squashing wilson partition weyl chiral multiplets squashing parent pages latex comments minor
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non_dup
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2193262
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10.1007/JHEP09(2011)136
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For an effective AdS theory, we present a simple prescription to compute the
renormalization of its dual boundary field theory. In particular, we define
anomalous dimension holographically as the dependence of the wave-function
renormalization factor on the radial cutoff in the Poincare patch of AdS. With
this definition, the anomalous dimensions of both single- and double- trace
operators are calculated. Three different dualities are considered with the
field theory being CFT, CFT with a double-trace deformation and spontaneously
broken CFT. For the second dual pair, we compute scaling corrections at the UV
and IR fixed points of the RG flow triggered by the double-trace deformation.
For the last case, we discuss whether our prescription is sensitive to the AdS
interior or equivalently, the IR physics of the dual field theory.Comment: 20 pages, 3 figure
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Effective AdS/renormalized CFT
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effective ads/renormalized cft
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prescription renormalization theory. anomalous holographically renormalization cutoff poincare patch ads. anomalous trace calculated. dualities trace deformation spontaneously broken cft. triggered trace deformation. prescription interior equivalently pages
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non_dup
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2184025
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10.1007/JHEP09(2011)140
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We consider the problem of reconstructing energies, momenta, and masses in
collider events with missing energy, along with the complications introduced by
combinatorial ambiguities and measurement errors. Typically, one reconstructs
more than one value and we show how the wrong values may be correlated with the
right ones. The problem has a natural formulation in terms of the theory of
Riemann surfaces. We discuss examples including top quark decays in the
Standard Model (relevant for top quark mass measurements and tests of spin
correlation), cascade decays in models of new physics containing dark matter
candidates, decays of third-generation leptoquarks in composite models of
electroweak symmetry breaking, and Higgs boson decay into two tau leptons.Comment: 28 pages, 6 figures; version accepted for publication, with
discussion of Higgs to tau tau deca
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Polynomials, Riemann surfaces, and reconstructing missing-energy events
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polynomials, riemann surfaces, and reconstructing missing-energy events
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reconstructing momenta collider missing complications combinatorial ambiguities errors. reconstructs wrong ones. formulation riemann surfaces. decays cascade decays candidates decays leptoquarks composite electroweak breaking boson pages publication deca
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non_dup
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2183305
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10.1007/JHEP09(2011)141
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Though the operator product expansion is applicable in the calculation of
current correlation functions in the Euclidean region, when approaching the
Minkowskian domain, violations of quark-hadron duality are expected to occur,
due to the presence of bound-state or resonance poles. In QCD finite-energy sum
rules, contour integrals in the complex energy plane down to the Minkowskian
axis have to be performed, and thus the question arises what the impact of
duality violations may be. The structure and possible relevance of duality
violations is investigated on the basis of two models: the Coulomb system and a
model for light-quark correlators which has already been studied previously. As
might yet be naively expected, duality violations are in some sense "maximal"
for zero-width bound states and they become weaker for broader resonances whose
poles lie further away from the physical axis. Furthermore, to a certain
extent, they can be suppressed by choosing appropriate weight functions in the
finite-energy sum rules. A simplified Ansatz for including effects of duality
violations in phenomenological QCD sum rule analyses is discussed as well.Comment: 17 pages, 6 figures; version to appear in JHE
|
What two models may teach us about duality violations in QCD
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what two models may teach us about duality violations in qcd
|
applicable euclidean approaching minkowskian violations hadron duality poles. contour integrals minkowskian arises duality violations relevance duality violations coulomb correlators previously. naively duality violations maximal weaker broader resonances poles away axis. suppressed choosing rules. simplified ansatz duality violations phenomenological pages
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non_dup
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71046998
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10.1007/JHEP09(2011)142
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Within low-scale seesaw mechanisms, such as the inverse and linear seesaw, one expects (i) potentially large lepton flavor violation (LFV) and (ii) sizeable non-standard neutrino interactions (NSI). We consider the interplay between the magnitude of non-unitarity effects in the lepton mixing matrix, and the constraints that follow from LFV searches in the laboratory. We find that NSI parameters can be sizeable, up to percent level in some cases, while LFV rates, such as that for \mu -> e \gamma, lie within current limits, including the recent one set by the MEG collaboration. As a result the upcoming long baseline neutrino experiments offer a window of opportunity for complementary LFV and weak universality tests
|
Lepton Flavor Violation and non-unitarity Lepton Mixing in Low-Scale Type-I Seesaw
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lepton flavor violation and non-unitarity lepton mixing in low-scale type-i seesaw
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seesaw seesaw expects potentially lepton flavor violation sizeable interplay unitarity lepton searches laboratory. sizeable percent gamma collaboration. upcoming offer window opportunity complementary universality
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non_dup
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5239719
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10.1007/JHEP09(2012)001
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We study general classes and properties of extremal and non-extremal static
black-hole solutions of N=2, d=5 supergravity coupled to vector multiplets
using the recently proposed H-FGK formalism, which we also extend to static
black strings. We explain how to determine the integration constants and
physical parameters of the black-hole and black-string solutions. We derive
some model-independent statements, including the transformation of non-extremal
flow equations to the form of those for the extremal flow. We apply our methods
to the construction of example solutions (among others a new extremal string
solution of heterotic string theory on K_3 \times S^1). In the cases where we
have calculated it explicitly, the product of areas of the inner and outer
horizon of a non-extremal solution coincides with the square of the
moduli-independent area of the horizon of the extremal solution with the same
charges.Comment: 33 pages. Revised version: references added. No other change
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Black holes and black strings of N=2, d=5 supergravity in the H-FGK
formalism
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black holes and black strings of n=2, d=5 supergravity in the h-fgk formalism
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extremal extremal supergravity multiplets formalism extend strings. solutions. derive statements extremal extremal flow. extremal heterotic explicitly outer horizon extremal coincides moduli horizon extremal pages. revised added.
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non_dup
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[] |
5236577
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10.1007/JHEP09(2012)002
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We construct a class of theories which extend New Massive Gravity to higher
orders in curvature in any dimension. The lagrangians arise as limits of a new
class of bimetric theories of Lovelock gravity, which are unitary theories free
from the Boulware-Deser ghost. These Lovelock bigravity models represent the
most general non-chiral ghost-free theories of an interacting massless and
massive spin-two field in any dimension. The scaling limit is taken in such a
way that unitarity is explicitly broken, but the Boulware-Deser ghost remains
absent. This automatically implies the existence of a holographic $c$-theorem
for these theories. We also show that the Born-Infeld extension of New Massive
Gravity falls into our class of models demonstrating that this theory is also
free of the Boulware-Deser ghost. These results extend existing connections
between New Massive Gravity, bigravity theories, Galileon theories and
holographic $c$-theorems.Comment: 11+5 page
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Massive Gravity Theories and limits of Ghost-free Bigravity models
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massive gravity theories and limits of ghost-free bigravity models
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extend massive orders curvature dimension. lagrangians arise bimetric lovelock unitary boulware deser ghost. lovelock bigravity chiral ghost interacting massless massive dimension. unitarity explicitly broken boulware deser ghost absent. automatically holographic theories. born infeld massive falls demonstrating boulware deser ghost. extend connections massive bigravity galileon holographic
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non_dup
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5256930
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10.1007/JHEP09(2012)003
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In this paper we study generalized attractors in N=2 gauged supergravity
theory in five dimensions coupled to arbitrary number of hyper, vector and
tensor multiplets. We look for attractor solutions with constant anholonomy
coefficients. By analyzing the equations of motion we derive the attractor
potential. We further show that the generalized attractor potential can be
obtained from the fermionic shifts. We study some simple examples and show that
constant anholonomy gives rise to homogeneous black branes in five dimensions.Comment: 30 pages, no figures,V3 minor revisions, to appear in JHE
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Generalized Attractors in Five-Dimensional Gauged Supergravity
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generalized attractors in five-dimensional gauged supergravity
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attractors gauged supergravity hyper multiplets. look attractor anholonomy coefficients. analyzing derive attractor potential. attractor fermionic shifts. anholonomy homogeneous branes pages minor revisions
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non_dup
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5249834
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10.1007/JHEP09(2012)004
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In the Einestein-dilaton theory with a Liouville potential parameterized by
$\eta$, we find a Schwarzschild-type black hole solution. This black hole
solution, whose asymptotic geometry is described by the warped metric, is
thermodynamically stable only for $0 \le \eta < 2$. Applying the gauge/gravity
duality, we find that the dual gauge theory represents a non-conformal thermal
system with the equation of state depending on $\eta$. After turning on the
bulk vector fluctuations with and without a dilaton coupling, we calculate the
charge diffusion constant, which indicates that the life time of the quasi
normal mode decreases with $\eta$. Interestingly, the vector fluctuation with
the dilaton coupling shows that the DC conductivity increases with temperature,
a feature commonly found in electrolytes.Comment: 27 pages and 2 figures, published in JHE
|
Non-conformal Hydrodynamics in Einstein-dilaton Theory
|
non-conformal hydrodynamics in einstein-dilaton theory
|
einestein dilaton liouville parameterized schwarzschild solution. asymptotic warped thermodynamically duality conformal turning dilaton quasi interestingly fluctuation dilaton conductivity commonly pages
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non_dup
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5236719
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10.1007/JHEP09(2012)005
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We develop a formalism for constructing the Pontecorvo-Maki-Nakagawa-Sakata
(PMNS) matrix and neutrino masses using an expansion that originates when a
sequence of heavy right handed neutrinos are integrated out, assuming a seesaw
mechanism for the origin of neutrino masses. The expansion establishes
relationships between the structure of the PMNS matrix and the mass differences
of neutrinos, and allows symmetry implications for measured deviations from
tri-bimaximal form to be studied systematically. Our approach does not depend
on choosing the rotation between the weak and mass eigenstates of the charged
lepton fields to be diagonal. We comment on using this expansion to examine the
symmetry implications of the recent results from the Daya-Bay collaboration
reporting the discovery of a non zero value for theta_{13}, indicating a
deviation from tri-bimaximal form, with a significance of 5.2 sigma.Comment: 16 pp, 1 figure v2: Jhep version, more exposition/description,results
unchange
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An expansion for Neutrino Phenomenology
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an expansion for neutrino phenomenology
|
formalism constructing pontecorvo maki nakagawa sakata pmns originates handed neutrinos seesaw masses. establishes pmns neutrinos deviations bimaximal systematically. choosing eigenstates lepton diagonal. comment examine daya reporting discovery theta bimaximal jhep exposition unchange
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non_dup
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[] |
5252611
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10.1007/JHEP09(2012)006
|
We consider one particularly interesting class of composite gauge-invariant
operators in N=4 super Yang-Mills theory. An exceptional feature of these
operators is that in the Thermodynamic Bethe Ansatz approach the one-loop
rapidities of the constituent magnons are shown to be exact in the 't Hooft
coupling constant. This is used to propose the mirror TBA description for these
operators. The proposal is shown to pass several non-trivial checks.Comment: 40 pages, 2 figures, 1 attached Mathematica noteboo
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Exceptional Operators in N=4 super Yang-Mills
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exceptional operators in n=4 super yang-mills
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composite super mills theory. exceptional thermodynamic bethe ansatz rapidities constituent magnons hooft constant. propose mirror operators. proposal pass trivial pages attached mathematica noteboo
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non_dup
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[] |
5249976
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10.1007/JHEP09(2012)008
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Static, charged black holes in the presence of a negative cosmological
constant and with a planar horizon are found in four dimensions. The solutions
have scalar secondary hair. We claim that these constitute the planar version
of the Martinez-Troncoso-Zanelli black holes, only known up to now for a curved
event horizon in four dimensions. Their planar version is rendered possible due
to the presence of two, equal and homogeneously distributed, axionic charges
dressing the flat horizon. The solutions are presented in the conformal and
minimal frame and their basic properties and thermodynamics analysed.
Entertaining recent applications to holographic superconductors, we expose two
branches of solutions: the undressed axionic Reissner-Nordstrom-AdS black hole,
and the novel black hole carrying secondary hair. We show that there is a
critical temperature at which the (bald) axionic Reissner-Nordstrom-AdS black
hole undergoes a second order phase transition to the hairy black hole
spontaneously acquiring scalar hair.Comment: 21 pages, 4 figure
|
Conformally coupled scalar black holes admit a flat horizon due to
axionic charge
|
conformally coupled scalar black holes admit a flat horizon due to axionic charge
|
holes cosmological planar horizon dimensions. hair. claim constitute planar martinez troncoso zanelli holes curved horizon dimensions. planar rendered homogeneously axionic charges dressing horizon. conformal thermodynamics analysed. entertaining holographic superconductors expose branches undressed axionic reissner nordstrom carrying hair. bald axionic reissner nordstrom undergoes hairy spontaneously acquiring pages
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non_dup
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[] |
2255128
|
10.1007/JHEP09(2012)009
|
We show that the ghost degrees of freedom of Einstein gravity with a Weyl
term can be eliminated by a simple mechanism that invokes local Lorentz
symmetry breaking. We demonstrate how the mechanism works in a cosmological
setting. The presence of the Weyl term forces a redefinition of the quantum
vacuum state of the tensor perturbations. As a consequence the amplitude of
their spectrum blows up when the Lorentz-violating scale becomes comparable to
the Hubble radius. Such a behaviour is in sharp contrast to what happens in
standard Weyl gravity where the gravitational ghosts smoothly damp out the
spectrum of primordial gravitational waves.Comment: 14 pages, 3 figures, REVTeX 4.
|
Lorentz-violating vs ghost gravitons: the example of Weyl gravity
|
lorentz-violating vs ghost gravitons: the example of weyl gravity
|
ghost freedom einstein weyl eliminated invokes lorentz breaking. cosmological setting. weyl forces redefinition perturbations. blows lorentz violating comparable hubble radius. sharp happens weyl gravitational ghosts smoothly damp primordial gravitational pages revtex
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non_dup
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[] |
5236778
|
10.1007/JHEP09(2012)010
|
Scale setting is of central importance in lattice QCD. It is required to
predict dimensional quantities in physical units. Moreover, it determines the
relative lattice spacings of computations performed at different values of the
bare coupling, and this is needed for extrapolating results into the continuum.
Thus, we calculate a new quantity, $w_0$, for setting the scale in lattice QCD,
which is based on the Wilson flow like the scale $t_0$ (M. Luscher, JHEP 1008
(2010) 071). It is cheap and straightforward to implement and compute. In
particular, it does not involve the delicate fitting of correlation functions
at asymptotic times. It typically can be determined on the few per-mil level.
We compute its continuum extrapolated value in 2+1-flavor QCD for physical and
non-physical pion and kaon masses, to allow for mass-independent scale setting
even away from the physical mass point. We demonstrate its robustness by
computing it with two very different actions (one of them with staggered, the
other with Wilson fermions) and by showing that the results agree for physical
quark masses in the continuum limit.Comment: 15 pages, 7 figures, 2 tables; Version published in JHE
|
High-precision scale setting in lattice QCD
|
high-precision scale setting in lattice qcd
|
qcd. predict quantities units. determines spacings computations bare extrapolating continuum. quantity wilson luscher jhep cheap straightforward implement compute. involve delicate fitting asymptotic times. level. continuum extrapolated flavor pion kaon away point. robustness staggered wilson fermions agree continuum pages tables
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non_dup
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[] |
5254542
|
10.1007/JHEP09(2012)011
|
We consider a general Kaluza-Klein reduction of a truncated Lovelock theory.
We find necessary geometric conditions for the reduction to be consistent. The
resulting lower-dimensional theory is a higher derivative scalar-tensor theory,
depends on a single real parameter and yields second-order field equations. Due
to the presence of higher-derivative terms, the theory has multiple
applications in modifications of Einstein gravity (Galileon/Horndesky theory)
and holography (Einstein-Maxwell-Dilaton theories). We find and analyze charged
black hole solutions with planar or curved horizons, both in the 'Einstein' and
'Galileon' frame, with or without cosmological constant. Naked singularities
are dressed by a geometric event horizon originating from the higher-derivative
terms. The near-horizon region of the near-extremal black hole is unaffected by
the presence of the higher derivatives, whether scale invariant or hyperscaling
violating. In the latter case, the area law for the entanglement entropy is
violated logarithmically, as expected in the presence of a Fermi surface. For
negative cosmological constant and planar horizons, thermodynamics and
first-order hydrodynamics are derived: the shear viscosity to entropy density
ratio does not depend on temperature, as expected from the higher-dimensional
scale invariance.Comment: v2: matches published version; typos corrected, references and
comments added, in particular regarding violation of the area law of the
entanglement entrop
|
Higher-derivative scalar-vector-tensor theories: black holes, Galileons,
singularity cloaking and holography
|
higher-derivative scalar-vector-tensor theories: black holes, galileons, singularity cloaking and holography
|
kaluza klein truncated lovelock theory. geometric consistent. equations. modifications einstein galileon horndesky holography einstein maxwell dilaton analyze planar curved horizons einstein galileon cosmological constant. naked singularities dressed geometric horizon originating terms. horizon extremal unaffected derivatives hyperscaling violating. entanglement violated logarithmically fermi surface. cosmological planar horizons thermodynamics hydrodynamics viscosity matches typos corrected comments violation entanglement entrop
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non_dup
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[] |
6207909
|
10.1007/JHEP09(2012)012
|
We develop quantization techniques for describing the nonassociative geometry
probed by closed strings in flat non-geometric R-flux backgrounds M. Starting
from a suitable Courant sigma-model on an open membrane with target space M,
regarded as a topological sector of closed string dynamics in R-space, we
derive a twisted Poisson sigma-model on the boundary of the membrane whose
target space is the cotangent bundle T^*M and whose quasi-Poisson structure
coincides with those previously proposed. We argue that from the membrane
perspective the path integral over multivalued closed string fields in Q-space
is equivalent to integrating over open strings in R-space. The corresponding
boundary correlation functions reproduce Kontsevich's deformation quantization
formula for the twisted Poisson manifolds. For constant R-flux, we derive
closed formulas for the corresponding nonassociative star product and its
associator, and compare them with previous proposals for a 3-product of fields
on R-space. We develop various versions of the Seiberg-Witten map which relate
our nonassociative star products to associative ones and add fluctuations to
the R-flux background. We show that the Kontsevich formula coincides with the
star product obtained by quantizing the dual of a Lie 2-algebra via convolution
in an integrating Lie 2-group associated to the T-dual doubled geometry, and
hence clarify the relation to the twisted convolution products for topological
nonassociative torus bundles. We further demonstrate how our approach leads to
a consistent quantization of Nambu-Poisson 3-brackets.Comment: 52 pages; v2: references adde
|
Membrane Sigma-Models and Quantization of Non-Geometric Flux Backgrounds
|
membrane sigma-models and quantization of non-geometric flux backgrounds
|
quantization describing nonassociative probed strings geometric backgrounds courant sigma regarded topological derive twisted poisson sigma cotangent bundle quasi poisson coincides proposed. argue perspective multivalued integrating strings space. reproduce kontsevich deformation quantization twisted poisson manifolds. derive formulas nonassociative associator proposals space. versions seiberg witten relate nonassociative associative background. kontsevich coincides quantizing convolution integrating doubled clarify twisted convolution topological nonassociative torus bundles. quantization nambu poisson pages adde
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non_dup
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[] |
6206359
|
10.1007/JHEP09(2012)015
|
In minimal supersymmetric models the $Z$-penguin usually provides
sub-dominant contributions to charged lepton flavour violating observables. In
this study, we consider the supersymmetric inverse seesaw in which the
non-minimal particle content allows for dominant contributions of the
$Z$-penguin to several lepton flavour violating observables. In particular, and
due to the low-scale (TeV) seesaw, the penguin contribution to, for instance,
$\Br(\mu \to 3e)$ and $\mu-e$ conversion in nuclei, allows to render some of
these observables within future sensitivity reach. Moreover, we show that in
this framework, the $Z$-penguin exhibits the same non-decoupling behaviour
which had previously been identified in flavour violating Higgs decays in the
Minimal Supersymmetric Standard Model.Comment: 29 pages, 9 figures, 4 tables; v2: minor corrections, version to
appear in JHE
|
Enhancing lepton flavour violation in the supersymmetric inverse seesaw
beyond the dipole contribution
|
enhancing lepton flavour violation in the supersymmetric inverse seesaw beyond the dipole contribution
|
supersymmetric penguin lepton flavour violating observables. supersymmetric seesaw penguin lepton flavour violating observables. seesaw penguin conversion nuclei render observables reach. penguin exhibits decoupling flavour violating decays supersymmetric pages tables minor
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non_dup
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[] |
6208078
|
10.1007/JHEP09(2012)018
|
We consider the equations of motion of the non-abelian 5-branes theory
recently constructed in http://arxiv.org/abs/arXiv:1203.4224 and find exact
string solutions both for uncompactified and compactified spacetime. Although
one does not have the full supersymmetric construction of the non-abelian (2,0)
theory, by combining knowledge of conformal symmetry and R-symmetry one can
argue for the form of the 1/2 BPS equations in the case when only one scalar
field is turned on. We solve this system and show that our string solutions
could be lifted to become solutions of the non-abelian (2,0) theory with
self-dual electric and magnetic charges, with the scalar field describing a
M2-brane spike emerging out of the multiple M5-branes worldvolume.Comment: 22 pages. LaTeX. 2 figure
|
Non-Abelian Self-Dual String Solutions
|
non-abelian self-dual string solutions
|
abelian branes uncompactified compactified spacetime. supersymmetric abelian combining conformal argue turned solve lifted abelian charges describing brane spike emerging branes pages. latex.
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non_dup
|
[] |
5235218
|
10.1007/JHEP09(2012)021
|
We discuss a general bound on the possibility to realise inflation in any
minimal supergravity with F-terms. The derivation crucially depends on the
sGoldstini, the scalar field directions that are singled out by spontaneous
supersymmetry breaking. The resulting bound involves both slow-roll parameters
and the geometry of the K\"ahler manifold of the chiral scalars. We analyse the
inflationary implications of this bound, and in particular discuss to what
extent the requirements of single field and slow-roll can both be met in F-term
inflation.Comment: 14 pages, improved analysis, references added, matches published
versio
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A geometric bound on F-term inflation
|
a geometric bound on f-term inflation
|
realise inflation supergravity terms. derivation crucially sgoldstini directions singled spontaneous supersymmetry breaking. involves slow roll ahler manifold chiral scalars. analyse inflationary slow roll pages matches versio
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non_dup
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[] |
5252011
|
10.1007/JHEP09(2012)022
|
We develop a general method of computing the contribution of the vertex
operators to the semi-classical correlation functions of heavy string states,
based on the state-operator correspondence and the integrable structure of the
system. Our method requires only the knowledge of the local behavior of the
saddle point configuration around each vertex insertion point and can be
applied to cases where the precise forms of the vertex operators are not known.
As an important application, we compute the contributions of the vertex
operators to the three-point functions of the large spin limit of the
Gubser-Klebanov-Polyakov (GKP) strings in $AdS_3$ spacetime, left unevaluated
in our previous work [arXiv:1110.3949] which initiated such a study. Combining
with the finite part of the action already computed previously and with the
newly evaluated divergent part of the action, we obtain finite three-point
functions with the expected dependence of the target space boundary coordinates
on the dilatation charge and the spin.Comment: 80 pages, 7 figures, v2: typos and minor errors corrected, a
reference added, v3: typos and a reference corrected, published versio
|
Wave functions and correlation functions for GKP strings from
integrability
|
wave functions and correlation functions for gkp strings from integrability
|
correspondence integrable system. saddle insertion precise known. gubser klebanov polyakov strings spacetime unevaluated initiated study. combining newly divergent dilatation pages typos minor corrected typos corrected versio
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non_dup
|
[] |
5234851
|
10.1007/JHEP09(2012)024
|
We study the sensitivity of top-antitop samples produced at all energy stages
of the Large Hadron Collider (LHC) to the nature of an underlying Z' boson, in
presence of full tree level standard model (SM) background effects and relative
interferences. We concentrate on differential mass spectra as well as both
spatial and spin asymmetries thereby demonstrating that exploiting combinations
of these observables will enable one to distinguish between sequential Z's and
those pertaining to Left-Right symmetric models as well as E6 inspired ones,
assuming realistic final state reconstruction efficiencies and error estimates.Comment: 21 pages, 6 colour figures, 10 table
|
Z' signals in polarised top-antitop final states
|
z' signals in polarised top-antitop final states
|
antitop hadron collider boson interferences. concentrate asymmetries thereby demonstrating exploiting combinations observables enable distinguish sequential pertaining inspired realistic reconstruction efficiencies pages colour
|
non_dup
|
[] |
5251679
|
10.1007/JHEP09(2012)025
|
We study the geometry of the scalar manifolds emerging in the no-scale sector
of Kahler moduli and matter fields in generic Calabi-Yau string
compactifications, and describe its implications on scalar masses. We consider
both heterotic and orientifold models and compare their characteristics. We
start from a general formula for the Kahler potential as a function of the
topological compactification data and study the structure of the curvature
tensor. We then determine the conditions for the space to be symmetric and show
that whenever this is the case the heterotic and the orientifold models give
the same scalar manifold. We finally study the structure of scalar masses in
this type of geometries, assuming that a generic superpotential triggers
spontaneous supersymmetry breaking. We show in particular that their behavior
crucially depends on the parameters controlling the departure of the geometry
from the coset situation. We first investigate the average sGoldstino mass in
the hidden sector and its sign, and study the implications on vacuum
metastability and the mass of the lightest scalar. We next examine the soft
scalar masses in the visible sector and their flavor structure, and study the
possibility of realizing a mild form of sequestering relying on a global
symmetry.Comment: 36 pages, no figure
|
Scalar geometry and masses in Calabi-Yau string models
|
scalar geometry and masses in calabi-yau string models
|
manifolds emerging kahler moduli generic calabi compactifications masses. heterotic orientifold characteristics. kahler topological compactification curvature tensor. whenever heterotic orientifold manifold. geometries generic superpotential triggers spontaneous supersymmetry breaking. crucially controlling departure coset situation. sgoldstino hidden metastability lightest scalar. examine visible flavor realizing mild sequestering relying pages
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non_dup
|
[] |
5237438
|
10.1007/JHEP09(2012)026
|
The operator product expansion (OPE) in 4d (super)conformal field theory is
of broad interest, for both formal and phenomenological applications. In this
paper, we use conformal perturbation theory to study the OPE of nearly-free
fields coupled to SCFTs. Under fairly general assumptions, we show that the OPE
of a chiral operator of dimension $\Delta = 1+\epsilon$ with its complex
conjugate always contains an operator of dimension less than $2 \Delta$. Our
bounds apply to Banks-Zaks fixed points and their generalizations, as we
illustrate using several examples.Comment: 36 pages; v2: typos fixed, minor change
|
Bounds on SCFTs from Conformal Perturbation Theory
|
bounds on scfts from conformal perturbation theory
|
super conformal broad formal phenomenological applications. conformal perturbation nearly scfts. fairly assumptions chiral delta epsilon conjugate delta bounds banks zaks generalizations illustrate pages typos minor
|
non_dup
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[] |
5253721
|
10.1007/JHEP09(2012)030
|
Emergent gravity is aimed at constructing a Riemannian geometry from U(1)
gauge fields on a noncommutative spacetime. But this construction can be
inverted to find corresponding U(1) gauge fields on a (generalized) Poisson
manifold given a Riemannian metric (M, g). We examine this bottom-up approach
with the LeBrun metric which is the most general scalar-flat Kahler metric with
a U(1) isometry and contains the Gibbons-Hawking metric, the real heaven as
well as the multi-blown up Burns metric which is a scalar-flat Kahler metric on
C^2 with n points blown up. The bottom-up approach clarifies some important
issues in emergent gravity.Comment: v3; 29 pages, minor clarifications for locally conformal symplectic
structure and the origin of diffeomorphism, version to appear in JHE
|
Notes on Emergent Gravity
|
notes on emergent gravity
|
emergent aimed constructing riemannian noncommutative spacetime. inverted poisson manifold riemannian examine lebrun kahler isometry gibbons hawking heaven blown burns kahler blown clarifies emergent pages minor clarifications locally conformal symplectic diffeomorphism
|
non_dup
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[] |
5233270
|
10.1007/JHEP09(2012)031
|
The nonperturbative approach to soft high-energy hadron-hadron scattering,
based on the analytic continuation of Wilson-loop correlation functions from
Euclidean to Minkowskian theory, allows to investigate the asymptotic energy
dependence of hadron-hadron total cross sections in lattice QCD. In this paper
we will show, using best fits of the lattice data with proper functional forms
satisfying unitarity and other physical constraints, how indications emerge in
favor of a universal asymptotic high-energy behavior of the kind B log^2 s for
hadronic total cross sections.Comment: Revised and extended version; 29 pages, 4 figure
|
Asymptotic Energy Dependence of Hadronic Total Cross Sections from
Lattice QCD
|
asymptotic energy dependence of hadronic total cross sections from lattice qcd
|
nonperturbative hadron hadron analytic continuation wilson euclidean minkowskian asymptotic hadron hadron qcd. fits proper satisfying unitarity indications emerge favor universal asymptotic kind hadronic revised pages
|
non_dup
|
[] |
5259402
|
10.1007/JHEP09(2012)033
|
We present a set of equations for a 4D Killing spinor which guarantees the
Seiberg-Witten theories on a curved background to be supersymmetric. The
equations involve an SU(2) gauge field and some auxiliary fields in addition to
the metric. Four-dimensional ellipsoids with U(1)xU(1) isometry are shown to
admit a supersymmetry if these additional fields are chosen appropriately. We
compute the partition function of general Seiberg-Witten theories on
ellipsoids, and the result suggests a correspondence with 2D Liouville or Toda
correlators with general coupling constant b.Comment: 1+27 pages, no figures. v2: references added, minor corrections.
(published in JHEP) v3: results on FI-term adde
|
Seiberg-Witten Theories on Ellipsoids
|
seiberg-witten theories on ellipsoids
|
killing spinor guarantees seiberg witten curved supersymmetric. involve auxiliary metric. ellipsoids isometry admit supersymmetry appropriately. partition seiberg witten ellipsoids correspondence liouville toda correlators pages figures. minor corrections. jhep adde
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non_dup
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[] |
19597732
|
10.1007/JHEP09(2012)034
|
We investigate infinite families of 3d N=2 superconformal Chern-Simons quivers with an arbitrarily large number of gauge groups arising on M2-branes over toric CY4’s. These theories have the same matter content and superpotential of those on D3-branes probing cones over La,b,a Sasaki-Einstein manifolds. For all these infinite families, we explicitly show the correspondence between the free energy F on S3 and the volume of the 7-dimensional base of the associated CY4, even before extremization. Symmetries of the toric diagram are exploited for reducing the dimensionality of the space over which the volume of the Sasaki-Einstein manifold is extremized. Similarly, the space of trial R-charges of the gauge theory is constrained using symmetries of the quiver. Our results add to those existing in the literature, providing further support for the correspondence. We develop a lifting algorithm, based on the Type IIB realization of these theories, that takes from CY3’s to CY4’s and we use it to efficiently generate the models studied in the paper. Finally, we show that in all the infinite families we consider F2 can be expressed, even off-shell, as a quartic function in R-charges associated to certain 5-cycles. This suggests that a quartic formula on R-charges, analogous to a similar cubic function for the central charge a in 4d, exists for all toric toric CY4’s and we present some ideas regarding its general form
|
Free energy v.s. Sasaki-Einstein volume for infinite families of M2-brane theories.
|
free energy v.s. sasaki-einstein volume for infinite families of m2-brane theories.
|
infinite families superconformal chern simons quivers arbitrarily arising branes toric superpotential branes probing cones sasaki einstein manifolds. infinite families explicitly correspondence extremization. symmetries toric exploited reducing dimensionality sasaki einstein manifold extremized. charges constrained symmetries quiver. correspondence. lifting realization efficiently paper. infinite families quartic charges cycles. quartic charges analogous cubic toric toric ideas
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non_dup
|
[] |
6207794
|
10.1007/JHEP09(2012)036
|
We define and study a new class of 4d N=1 superconformal quiver gauge
theories associated with a planar bipartite network. While UV description is
not unique due to Seiberg duality, we can classify the IR fixed points of the
theory by a permutation, or equivalently a cell of the totally non-negative
Grassmannian. The story is similar to a bipartite network on the torus
classified by a Newton polygon. We then generalize the network to a general
bordered Riemann surface and define IR SCFT from the geometric data of a
Riemann surface. We also comment on IR R-charges and superconformal indices of
our theories.Comment: 28 pages, 28 figures; v2: minor correction
|
Network and Seiberg Duality
|
network and seiberg duality
|
superconformal quiver planar bipartite network. seiberg duality classify permutation equivalently totally grassmannian. story bipartite torus classified newton polygon. generalize bordered riemann scft geometric riemann surface. comment charges superconformal indices pages minor
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non_dup
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[] |
19597734
|
10.1007/JHEP09(2012)038
|
We investigate the connections between flavored quivers, dimer models, and BPS pyramids for generic toric Calabi-Yau threefolds from various perspectives. We introduce a purely field theoretic definition of both finite and infinite pyramids in terms of quivers with flavors. These pyramids are associated to the counting of BPS invariants for generic toric Calabi-Yau threefolds. We discuss how cluster transformations provide an efficient recursive method for computing pyramid partition functions and show that the recursion is equivalent to the multidimensional octahedron recurrence. Transitions between different pyramids are related to Seiberg dualities, and we offer complimentary characterizations of these transitions in terms of the motion of zonotopes and duality webs. Our methods apply to completely general geometries including those with vanishing 4-cycles, which are associated to chiral quivers, thus overcoming one of the main limitations in the existing literature. We illustrate our ideas with explicit results for the infinite family of La,b,c geometries, dP2, pseudo-dP2, and dP3. The counting of pyramid partitions for dP1 gives rise to the Somos-4 sequence, while dP2 and pseudo-dP2 generate the Somos-5 sequence. Our results for dP3 reproduce and extend those previously obtained for this theory, which were originally obtained from dimer shuffling
|
Colored BPS pyramid partition functions, quivers and cluster transformations.
|
colored bps pyramid partition functions, quivers and cluster transformations.
|
connections flavored quivers dimer pyramids generic toric calabi threefolds perspectives. purely theoretic infinite pyramids quivers flavors. pyramids counting invariants generic toric calabi threefolds. transformations recursive pyramid partition recursion multidimensional octahedron recurrence. pyramids seiberg dualities offer complimentary characterizations zonotopes duality webs. geometries vanishing cycles chiral quivers overcoming limitations literature. illustrate ideas infinite geometries pseudo counting pyramid partitions somos pseudo somos sequence. reproduce extend originally dimer shuffling
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non_dup
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[] |
6208030
|
10.1007/JHEP09(2012)039
|
We study the effects of the temperature and of a magnetic field in the setup
of an intersection of D3/D7 branes, where a large number of D7 branes is
smeared in the transverse directions to allow for a perturbative solution in a
backreaction parameter. The magnetic field sources an anisotropy in the plasma,
and we investigate its physical consequences for the thermodynamics and energy
loss of particles probing the system. In particular we comment on the
stress-energy tensor of the plasma, the propagation of sound in the directions
parallel and orthogonal to the magnetic field, the drag force of a quark moving
through the medium and jet quenching.Comment: 29 pages + appendices, 5 figures. v2 Version to appear in JHEP, with
minor revisions, references added and typos correcte
|
D3/D7 Quark-Gluon Plasma with Magnetically Induced Anisotropy
|
d3/d7 quark-gluon plasma with magnetically induced anisotropy
|
setup intersection branes branes smeared directions perturbative backreaction parameter. anisotropy consequences thermodynamics probing system. comment propagation sound directions orthogonal drag moving pages appendices figures. jhep minor revisions typos correcte
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non_dup
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[] |
5251658
|
10.1007/JHEP09(2012)042
|
We present an algorithm for the integrand-level reduction of multi-loop
amplitudes of renormalizable field theories, based on computational algebraic
geometry. This algorithm uses (1) the Gr\"obner basis method to determine the
basis for integrand-level reduction, (2) the primary decomposition of an ideal
to classify all inequivalent solutions of unitarity cuts. The resulting basis
and cut solutions can be used to reconstruct the integrand from unitarity cuts,
via polynomial fitting techniques. The basis determination part of the
algorithm has been implemented in the Mathematica package, BasisDet. The
primary decomposition part can be readily carried out by algebraic geometry
softwares, with the output of the package BasisDet. The algorithm works in both
D=4 and $D=4-2\epsilon$ dimensions, and we present some two and three-loop
examples of applications of this algorithm.Comment: published version: typos corrected; more examples adde
|
Integrand-Level Reduction of Loop Amplitudes by Computational Algebraic
Geometry Methods
|
integrand-level reduction of loop amplitudes by computational algebraic geometry methods
|
integrand amplitudes renormalizable algebraic geometry. obner integrand decomposition ideal classify inequivalent unitarity cuts. reconstruct integrand unitarity cuts fitting techniques. implemented mathematica package basisdet. decomposition readily algebraic softwares package basisdet. epsilon typos corrected adde
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non_dup
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[] |
5233363
|
10.1007/JHEP09(2012)044
|
We revisit the effective field theory of long relativistic strings such as
confining flux tubes in QCD. We derive the Polchinski-Strominger interaction by
a calculation in static gauge. This interaction implies that a non-critical
string which initially oscillates in one direction gets excited in orthogonal
directions as well. In static gauge no additional term in the effective action
is needed to obtain this effect. It results from a one-loop calculation using
the Nambu-Goto action. Non-linearly realized Lorentz symmetry is manifest at
all stages in dimensional regularization. We also explain that independent of
the number of dimensions non-covariant counterterms have to be added to the
action in the commonly used zeta-function regularization.Comment: 21 pages, 4 figures, v2: typo corrected, references added, published
versio
|
Effective String Theory Revisited
|
effective string theory revisited
|
revisit relativistic strings confining tubes qcd. derive polchinski strominger gauge. initially oscillates gets excited orthogonal directions well. effect. nambu goto action. linearly realized lorentz manifest regularization. covariant counterterms commonly zeta pages typo corrected versio
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non_dup
|
[] |
5235853
|
10.1007/JHEP09(2012)046
|
We study the thermal partition function of quantum field theories on
arbitrary stationary background spacetime, and with arbitrary stationary
background gauge fields, in the long wavelength expansion. We demonstrate that
the equations of relativistic hydrodynamics are significantly constrained by
the requirement of consistency with any partition function. In examples at low
orders in the derivative expansion we demonstrate that these constraints
coincide precisely with the equalities between hydrodynamical transport
coefficients that follow from the local form of the second law of
thermodynamics. In particular we recover the results of Son and Surowka on the
chiral magnetic and chiral vorticity flows, starting from a local partition
function that manifestly reproduces the field theory anomaly, without making
any reference to an entropy current. We conjecture that the relations between
transport coefficients that follow from the second law of thermodynamics agree
to all orders in the derivative expansion with the constraints described in
this paper.Comment: Typos corrected, References adde
|
Constraints on Fluid Dynamics from Equilibrium Partition Functions
|
constraints on fluid dynamics from equilibrium partition functions
|
partition stationary spacetime stationary expansion. relativistic hydrodynamics constrained requirement consistency partition function. orders coincide precisely equalities hydrodynamical thermodynamics. recover surowka chiral chiral vorticity flows partition manifestly reproduces anomaly current. conjecture thermodynamics agree orders typos corrected adde
|
non_dup
|
[] |
6206625
|
10.1007/JHEP09(2012)047
|
We study the production of a W boson in association with n hard QCD jets (for
n>=2), with a particular emphasis on results relevant for the Large Hadron
Collider (7 TeV and 8 TeV). We present predictions for this process from High
Energy Jets, a framework for all-order resummation of the dominant
contributions from wide-angle QCD emissions. We first compare predictions
against recent ATLAS data and then shift focus to observables and regions of
phase space where effects beyond NLO are expected to be large.Comment: 19 pages, 9 figure
|
W Plus Multiple Jets at the LHC with High Energy Jets
|
w plus multiple jets at the lhc with high energy jets
|
boson jets emphasis hadron collider jets resummation emissions. atlas observables pages
|
non_dup
|
[] |
9262038
|
10.1007/JHEP09(2012)052
|
We compute the three loop MSbar anomalous dimension for the 3-quark operator
corresponding to the proton. This requires the treatment of gamma^5 within
dimensional regularization as well as evanescent operators generated through
the renormalization. We extend the Larin scheme for gamma^5 to a mixing matrix
of finite renormalization constants chosen so that chiral symmetry is manifest
in four dimensions. We also provide the finite part of the Green's function at
two loops where the operator is inserted at zero momentum in a quark 3-point
function in an arbitrary linear covariant gauge in order to assist with the
lattice measurement of the same quantity. The renormalization of the
generalized 3-quark operators in the scheme devised by Kraenkl and Manashov is
extended to three loops and the anomalous dimensions for the (1/2,0), (3/2,0)
and (1,1/2) spin operators with various chiralities are also given.Comment: 27 latex pages, anc directory now contains txt file with anomalous
dimensions and amplitudes in analytic for
|
Three loop renormalization of 3-quark operators in QCD
|
three loop renormalization of 3-quark operators in qcd
|
msbar anomalous proton. gamma regularization evanescent renormalization. extend larin gamma renormalization chiral manifest dimensions. loops inserted covariant assist quantity. renormalization devised kraenkl manashov loops anomalous chiralities latex pages directory file anomalous amplitudes analytic
|
non_dup
|
[] |
6207490
|
10.1007/JHEP09(2012)054
|
We perform a study of the dark matter candidates of a constrained version of
the minimal R-parity-conserving supersymmetric model with a gauged
$U(1)_{B-L}$. It turns out that there are four additional candidates for dark
matter in comparison to the MSSM: two kinds of neutralino, which either
correspond to the gaugino of the $U(1)_{B-L}$ or to a fermionic bilepton, as
well as "right-handed" CP-even and -odd sneutrinos. The correct dark matter
relic density of the neutralinos can be obtained due to different mechanisms
including new co-annihilation regions and resonances. The large additional
Yukawa couplings required to break the $U(1)_{B-L}$ radiatively often lead to
large annihilation cross sections for the sneutrinos. The correct treatment of
gauge kinetic mixing is crucial to the success of some scenarios. All
candidates are consistent with the exclusion limits of Xenon100.Comment: 45 pages, 22 figures; v2: extended discussion of direct detection
cross section, matches published versio
|
Dark matter scenarios in the minimal SUSY B-L model
|
dark matter scenarios in the minimal susy b-l model
|
candidates constrained parity conserving supersymmetric gauged turns candidates mssm kinds neutralino gaugino fermionic bilepton handed sneutrinos. relic neutralinos annihilation resonances. yukawa couplings break radiatively annihilation sneutrinos. crucial success scenarios. candidates exclusion pages matches versio
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non_dup
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[] |
5241660
|
10.1007/JHEP09(2012)056
|
We investigate the localization problem of matter fields within the 5D
standing wave braneworld. In this model the brane emits anisotropic waves into
the bulk with different amplitudes along different spatial dimensions. We show
that in the case of increasing warp factor there exist the pure gravitational
localization of all kinds of quantum and classical particles on the brane. For
classical particles the anisotropy of the background metric is hidden, brane
fields exhibit standard Lorentz symmetry in spite of anisotropic nature of the
primordial 5D metric.Comment: The version accepted by JHE
|
Localization of Matter Fields in the 5D Standing Wave Braneworld
|
localization of matter fields in the 5d standing wave braneworld
|
localization standing braneworld. brane emits anisotropic amplitudes dimensions. warp gravitational localization kinds brane. anisotropy hidden brane exhibit lorentz spite anisotropic primordial
|
non_dup
|
[] |
5255426
|
10.1007/JHEP09(2012)059
|
We study the realization of non-Abelian discrete gauge symmetries in 4d field
theory and string theory compactifications. The underlying structure
generalizes the Abelian case, and follows from the interplay between gaugings
of non-Abelian isometries of the scalar manifold and field identifications
making axion-like fields periodic. We present several classes of string
constructions realizing non-Abelian discrete gauge symmetries. In particular,
compactifications with torsion homology classes, where non-Abelianity arises
microscopically from the Hanany-Witten effect, or compactifications with
non-Abelian discrete isometry groups, like twisted tori. We finally focus on
the more interesting case of magnetized branes in toroidal compactifications
and quotients thereof (and their heterotic and intersecting duals), in which
the non-Abelian discrete gauge symmetries imply powerful selection rules for
Yukawa couplings of charged matter fields. In particular, in MSSM-like models
they correspond to discrete flavour symmetries constraining the quark and
lepton mass matrices, as we show in specific examples.Comment: 58 pages; minor typos corrected and references adde
|
Non-Abelian discrete gauge symmetries in 4d string models
|
non-abelian discrete gauge symmetries in 4d string models
|
realization abelian symmetries compactifications. generalizes abelian interplay gaugings abelian isometries manifold identifications axion periodic. constructions realizing abelian symmetries. compactifications torsion homology abelianity arises microscopically hanany witten compactifications abelian isometry twisted tori. magnetized branes toroidal compactifications quotients thereof heterotic intersecting duals abelian symmetries imply powerful yukawa couplings fields. mssm flavour symmetries constraining lepton pages minor typos corrected adde
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non_dup
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[] |
5252832
|
10.1007/JHEP09(2012)060
|
The recent papers arXiv:1110.0971 and arXiv:1201.5431 have provided a
superfield description for vector-tensor multiplets and their Chern-Simons
couplings in 4D N = 2 conformal supergravity. Here we develop a superform
formulation for these theories. Furthermore an alternative means of gauging the
central charge is given, making use of a deformed vector multiplet, which may
be thought of as a variant vector-tensor multiplet. Its Chern-Simons couplings
to additional vector multiplets are also constructed. This multiplet together
with its Chern-Simons couplings are new results not considered by de Wit et al.
in hep-th/9710212.Comment: 28 pages. V2: Typos corrected and references updated; V3: References
updated and typo correcte
|
Superform formulation for vector-tensor multiplets in conformal
supergravity
|
superform formulation for vector-tensor multiplets in conformal supergravity
|
papers superfield multiplets chern simons couplings conformal supergravity. superform formulation theories. gauging deformed multiplet thought variant multiplet. chern simons couplings multiplets constructed. multiplet chern simons couplings pages. typos corrected updated updated typo correcte
|
non_dup
|
[] |
9327187
|
10.1007/JHEP09(2012)062
|
We study the Hawking effect in terms of the geometric phase acquired by a
two-level atom as a result of coupling to vacuum fluctuations outside a
Schwarzschild black hole in a gedanken experiment. We treat the atom in
interaction with a bath of fluctuating quantized massless scalar fields as an
open quantum system, whose dynamics is governed by a master equation obtained
by tracing over the field degrees of freedom. The nonunitary effects of this
system are examined by analyzing the geometric phase for the Boulware, Unruh
and Hartle-Hawking vacua respectively. We find, for all the three cases, that
the geometric phase of the atom turns out to be affected by the space-time
curvature which backscatters the vacuum field modes. In both the Unruh and
Hartle-Hawking vacua, the geometric phase exhibits similar behaviors as if
there were thermal radiation at the Hawking temperature from the black hole.
So, a measurement of the change of the geometric phase as opposed to that in a
flat space-time can in principle reveal the existence of the Hawking radiation.Comment: 14 pages, no figures, a typo in the References corrected, version to
appear in JHEP. arXiv admin note: text overlap with arXiv:1109.033
|
Geometric phase outside a Schwarzschild black hole and the Hawking
effect
|
geometric phase outside a schwarzschild black hole and the hawking effect
|
hawking geometric acquired atom schwarzschild gedanken experiment. treat atom bath fluctuating quantized massless governed master tracing freedom. nonunitary analyzing geometric boulware unruh hartle hawking vacua respectively. geometric atom turns curvature backscatters modes. unruh hartle hawking vacua geometric exhibits behaviors hawking hole. geometric opposed reveal hawking pages typo corrected jhep. admin overlap
|
non_dup
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[] |
5235076
|
10.1007/JHEP09(2012)063
|
The M-theory origin of the IIB gauged supergravities in nine dimensions,
classified according to the inequivalent classes of monodromy, is shown to
exactly corresponds to the global description of the supermembrane with central
charges. The global description is a realization of the sculpting mechanism of
gauging (arXiv:1107.3255) and it is associated to particular deformation of
fibrations. The supermembrane with central charges may be formulated in terms
of sections on symplectic torus bundles with SL(2,Z) monodromy. This global
formulation corresponds to the gauging of the abelian subgroups of SL(2,Z)
associated to monodromies acting on the target torus. We show the existence of
the trombone symmetry in the supermembrane formulated as a non-linear
realization of the SL(2,Z) symmetry and construct its gauging in terms of the
supermembrane formulated on an inequivalent class of symplectic torus
fibration. The supermembrane also exhibits invariance under T-duality and we
find the explicit T-duality transformation. It has a natural interpretation in
terms of the cohomology of the base manifold and the homology of the target
torus. We conjecture that this construction also holds for the IIA origin of
gauged supergravities in 9D such that the supermembrane becomes the origin of
all type II supergravities in 9D. The geometric structure of the symplectic
torus bundle goes beyond the classification on conjugated classes of SL(2,Z).
It depends on the elements of the coinvariant group associated to the monodromy
group. The possible values of the (p,q) charges on a given symplectic torus
bundle are restricted to the corresponding equivalence class defining the
element of the coinvariant group.Comment: 41 pages, Latex. Typos corrected, references added, appendix added.
Sections enlarged with more examples and clarifying explanations. Minor
corrections in section 8. Results unchange
|
Supermembrane origin of type II gauged supergravities in 9D
|
supermembrane origin of type ii gauged supergravities in 9d
|
gauged supergravities nine classified inequivalent monodromy supermembrane charges. realization sculpting gauging deformation fibrations. supermembrane charges formulated symplectic torus bundles monodromy. formulation gauging abelian subgroups monodromies acting torus. trombone supermembrane formulated realization gauging supermembrane formulated inequivalent symplectic torus fibration. supermembrane exhibits invariance duality duality transformation. cohomology manifold homology torus. conjecture gauged supergravities supermembrane supergravities geometric symplectic torus bundle goes conjugated coinvariant monodromy group. charges symplectic torus bundle restricted equivalence defining coinvariant pages latex. typos corrected added. enlarged clarifying explanations. minor unchange
|
non_dup
|
[] |
5256271
|
10.1007/JHEP09(2012)064
|
We show that recently proposed linear sigma models with torsion can be
obtained from unconventional branches of conventional gauge theories. This
observation puts models with log interactions on firm footing. If non-anomalous
multiplets are integrated out, the resulting low-energy theory involves log
interactions of neutral fields. For these cases, we find a sigma model geometry
which is both non-toric and includes brane sources. These are heterotic sigma
models with branes. Surprisingly, there are massive models with compact complex
non-Kahler target spaces, which include brane/anti-brane sources. The simplest
conformal models describe wrapped heterotic NS5-branes. We present examples of
both types.Comment: 36 pages, LaTeX, 2 figures; typo in Appendix fixed; references added
and additional minor change
|
Novel Branches of (0,2) Theories
|
novel branches of (0,2) theories
|
sigma torsion unconventional branches theories. puts firm footing. anomalous multiplets involves neutral fields. sigma toric brane sources. heterotic sigma branes. surprisingly massive kahler brane brane sources. simplest conformal wrapped heterotic branes. pages latex typo minor
|
non_dup
|
[] |
60622956
|
10.1007/JHEP09(2012)070
|
Journal of High Energy Physics 2012.9 (2012): 070 reproduced by permission of Scuola Internazionale Superiore di Studi Avanzati (SISSA)Artículo escrito por un elevado número de autores, solo se referencian el que aparece en primer lugar, el nombre del grupo de colaboración, si le hubiere, y los autores pertenecientes a la UAMA search for the Standard Model Higgs boson decaying into a pair of τ leptons is reported. The analysis is based on a data sample of proton-proton collisions collected by the ATLAS experiment at the LHC and corresponding to an integrated luminosity of 4.7fb-1. No significant excess over the expected background is observed in the Higgs boson mass range of 100-150 GeV. The observed (expected) upper limits on the cross section times the branching ratio for H → τ+τ- are found to be between 2.9 (3.4) and 11.7 (8.2) times the Standard Model prediction for this mass rang
|
Search for the Standard Model Higgs boson in the H → τ+τ- decay mode in √s = 7TeV pp collisions with ATLAS
|
search for the standard model higgs boson in the h → τ+τ- decay mode in √s = 7tev pp collisions with atlas
|
reproduced permission scuola internazionale superiore studi avanzati sissa artículo escrito elevado número autores solo referencian aparece primer lugar nombre grupo colaboración hubiere autores pertenecientes uama boson decaying leptons reported. proton proton collisions atlas luminosity excess boson gev. branching rang
|
non_dup
|
[] |
5232284
|
10.1007/JHEP09(2012)071
|
The Higgs boson is predicted to have spin zero. The ATLAS and CMS experiments
have recently reported of an excess of events with mass ~ 125 GeV that has some
of the characteristics expected for a Higgs boson. We address the questions
whether there is already any evidence that this excess has spin zero, and how
this possibility could be confirmed in the near future. The excess observed in
the gamma gamma final state could not have spin one, leaving zero and two as
open possibilities. We calculate the angular distribution of gamma gamma pairs
from the decays of a spin-two boson produced in gluon-gluon collisions, showing
that is unique and distinct from the spin-zero case. We also calculate the
distributions for lepton pairs that would be produced in the W W* decays of a
spin-two boson, which are very different from those in Higgs decays, and note
that the kinematics of the event selection used to produce the excess observed
in the W W* final state have reduced efficiency for spin two.Comment: 22 pages, 22 figures, Version accepted for publication in JHEP,
includes additional plots of dilepton mass distribution
|
Does the `Higgs' have Spin Zero?
|
does the `higgs' have spin zero?
|
boson zero. atlas excess boson. excess confirmed future. excess gamma gamma leaving possibilities. gamma gamma decays boson gluon gluon collisions case. lepton decays boson decays kinematics excess pages publication jhep plots dilepton
|
non_dup
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[] |
2254455
|
10.1007/JHEP09(2012)072
|
We study the time evolution of the mass gap of the O(N) non-linear sigma
model in 2+1 dimensions due to a time-dependent coupling in the large-$N$
limit. Using the Schwinger-Keldysh approach, we derive a set of equations at
large $N$ which determine the time dependent gap in terms of the coupling.
These equations lead to a criterion for the breakdown of adiabaticity for slow
variation of the coupling leading to a Kibble-Zurek scaling law. We describe a
self-consistent numerical procedure to solve these large-$N$ equations and
provide explicit numerical solutions for a coupling which starts deep in the
gapped phase at early times and approaches the zero temperature equilibrium
critical point $g_c$ in a linear fashion. We demonstrate that for such a
protocol there is a value of the coupling $g= g_c^{\rm dyn}> g_c$ where the gap
function vanishes, possibly indicating a dynamical instability. We study the
dependence of $g_c^{\rm dyn}$ on both the rate of change of the coupling and
the initial temperature. We also verify, by studying the evolution of the mass
gap subsequent to a sudden change in $g$, that the model does not display
thermalization within a finite time interval $t_0$ and discuss the implications
of this observation for its conjectured gravitational dual as a higher spin
theory in $AdS_4$.Comment: 22 pages, 9 figures. Typos corrected, references rearranged and
added.v3 : sections rearranged, abstract modified, comment about Kibble-Zurek
scaling correcte
|
Non-equilibrium Dynamics of O(N) Nonlinear Sigma models: a Large-N
approach
|
non-equilibrium dynamics of o(n) nonlinear sigma models: a large-n approach
|
sigma limit. schwinger keldysh derive coupling. criterion breakdown adiabaticity slow kibble zurek law. solve starts gapped fashion. vanishes possibly instability. temperature. verify studying sudden display thermalization conjectured gravitational .comment pages figures. typos corrected rearranged added.v rearranged comment kibble zurek correcte
|
non_dup
|
[] |
5255963
|
10.1007/JHEP09(2012)074
|
We provide a non-trivial check of the AdS_4/CFT_3 correspondence recently
proposed in arXiv:1106.4253 by verifying the GKPW relation in the large N
limit. The CFT free energy is obtained from the previous works
(arXiv:1105.2551, arXiv:1105.4390) on the S^3 partition function for
3-dimensional N=4 SCFT T[SU(N)]. This is matched with the computation of the
type IIB action on the corresponding gravity background. We unexpectedly find
that the leading behavior of the free energy at large N is 1/2 N^2 ln N. We
also extend our results to richer theories and argue that 1/2 N^2 ln N is the
maximal free energy at large N in this class of gauge theories.Comment: 20 pages, 3 figure
|
Large N Free Energy of 3d N=4 SCFTs and AdS/CFT
|
large n free energy of 3d n=4 scfts and ads/cft
|
trivial check correspondence verifying gkpw limit. partition scft matched background. unexpectedly extend richer argue maximal pages
|
non_dup
|
[] |
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