pinecone/core-2020-05-10-deduplication huggingface dataset:
Colliding AdS gravitational shock waves in various dimensions and
  holography

The formation of marginally trapped surfaces in the off-center collision of
two shock waves on AdS_D (with D=4,5,6,7 and 8) is studied numerically. We
focus on the case when the two waves collide with nonvanishing impact parameter
while the sources are located at the same value of the holographic coordinate.
In all cases a critical value of the impact parameter is found above which no
trapped surface is formed. The numerical results show the existence of a simple
scaling relation between the critical impact parameter and the energy of the
colliding waves. Using the isometries of AdS_D we relate the solutions obtained
to the ones describing the collision of two waves with a purely holographic
impact parameter. This provides a gravitational dual for the head-on collision
of two lumps of energy of unequal size.Comment: 25 pages, 11 figures. v2: minor changes, typos corrected. To appear
  in JHE
Einstein-Gauss-Bonnet black strings

We construct uniform black-string solutions in Einstein-Gauss-Bonnet gravity
for all dimensions $d$ between five and ten and discuss their basic properties.
Closed form solutions are found by taking the Gauss-Bonnet term as a
perturbation from pure Einstein gravity. Nonperturbative solutions are
constructed by solving numerically the equations of the model. The
Gregory-Laflamme instability of the black strings is explored via linearized
perturbation theory. Our results indicate that new qualitative features occur
for $d=6$, in which case stable configurations exist for large enough values of
the Gauss-Bonnet coupling constant. For other dimensions, the black strings are
dynamically unstable and have also a negative specific heat. We argue that this
provides an explicit realization of the Gubser-Mitra conjecture, which links
local dynamical and thermodynamic stability. Nonuniform black strings in
Einstein-Gauss-Bonnet theory are also constructed in six spacetime dimensions.Comment: 33 pages, 11 figure
Baryonic symmetries and M5 branes in the AdS_4/CFT_3 correspondence

We study U(1) symmetries dual to Betti multiplets in the AdS_4/CFT_3
correspondence for M2 branes at Calabi-Yau four-fold singularities. Analysis of
the boundary conditions for vector fields in AdS_4 allows for a choice where
wrapped M5 brane states carrying non-zero charge under such symmetries can be
considered. We begin by focusing on isolated toric singularities without
vanishing six-cycles, and study in detail the cone over Q^{111}. The boundary
conditions considered are dual to a CFT where the gauge group is U(1)^2 x
SU(N)^4. We find agreement between the spectrum of gauge-invariant
baryonic-type operators in this theory and wrapped M5 brane states. Moreover,
the physics of vacua in which these symmetries are spontaneously broken
precisely matches a dual gravity analysis involving resolutions of the
singularity, where we are able to match condensates of the baryonic operators,
Goldstone bosons and global strings. We also argue more generally that theories
where the resolutions have six-cycles are expected to receive non-perturbative
corrections from M5 brane instantons. We give a general formula relating the
instanton action to normalizable harmonic two-forms, and compute it explicitly
for the Q^{222} example. The holographic interpretation of such instantons is
currently unclear.Comment: 92 pages, 10 figure
Model of M-theory with Eleven Matrices

We show that an action of a supermembrane in an eleven-dimensional spacetime
with a semi-light-cone gauge can be written only with Nambu-Poisson bracket and
an invariant symmetric bilinear form under an approximation. Thus, the action
under the conditions is manifestly covariant under volume preserving
diffeomorphism even when the world-volume metric is flat. Next, we propose two
3-algebraic models of M-theory which are obtained as a second quantization of
an action that is equivalent to the supermembrane action under the
approximation. The second quantization is defined by replacing Nambu-Poisson
bracket with finite-dimensional 3-algebras' brackets. Our models include eleven
matrices corresponding to all the eleven space-time coordinates in M-theory
although they possess not SO(1,10) but SO(1,2) x SO(8) or SO(1,2) x SU(4) x
U(1) covariance. They possess N=1 space-time supersymmetry in eleven dimensions
that consists of 16 kinematical and 16 dynamical ones. We also show that the
SU(4) model with a certain algebra reduces to BFSS matrix theory if DLCQ limit
is taken.Comment: 20 pages, references, a table and discussions added, typos correcte
Yangians, Grassmannians and T-duality

We investigate the Yangian symmetry of scattering amplitudes in N=4 super
Yang-Mills theory and show that its formulations in twistor and momentum
twistor space can be interchanged. In particular we show that the full symmetry
can be thought of as the Yangian of the dual superconformal algebra,
annihilating the amplitude with the MHV part factored out. The equivalence of
this picture with the one where the ordinary superconformal symmetry is thought
of as fundamental is an algebraic expression of T-duality. Motivated by this,
we analyse some recently proposed formulas, which reproduce different
contributions to amplitudes through a Grassmannian integral. We prove their
Yangian invariance by directly applying the generators.Comment: 28 pages, 1 figure; v2: minor correction
Spacetime Noncommutativity in Models with Warped Extradimensions

We construct consistent noncommutative (NC) deformations of the
Randall-Sundrum spacetime that solve the NC Einstein equations with a
non-trivial Poisson tensor depending on the fifth coordinate. In a class of
these deformations where the Poisson tensor is exponentially localized on one
of the branes (the NC-brane), we study the effects on bulk particles in terms
of Lorentz-violating operators induced by NC-brane interactions. We sketch two
models in which massive bulk particles mediate NC effects to an
almost-commutative SM-brane, such that observables at high energy colliders are
enhanced with respect to low energy and astrophysical observables.Comment: 15 pages, LaTeX, pdf figures included, to appear in JHE
Note on Light-like Tachyon Condensation

In this paper closed string emission and open string pair production from the
light-like rolling tachyon solution are calculated in subcritical string theory
in the background of a linear dilaton. The rolling light-like tachyon
represents the inhomogeneous decay of unstable D-brane. The decay rate is given
by the imaginary part of annulus diagram which can be calculated using the
boundary state/sigma-model method. It is found that the decay rate is finite in
the open string ultraviolet region and depends on tachyon profile in the open
string infrared region.Comment: 15 pages, no figures,discussion added, published versio
Multi-scalar tachyon potential on non-BPS domain walls

We have considered the multi-scalar and multi-tachyon fields living on a 3d
domain wall embedded in a 5d dimensional Minkowski spacetime. The effective
action for such a domain wall can be found by integrating out the normal modes
as vibrating modes around the domain wall solution of a truncated 5d
supergravity action. The multi-scalar tachyon potential are good enough to
modeling assisted inflation scenario with multi-tachyon fields. The tachyon
condensation are also briefly addressed.Comment: version to appear in JHEP, 18 pages, 3 figure
Compatibility of neutrino DIS data and global analyses of parton
  distribution functions

Neutrino\antineutrino deep inelastic scattering (DIS) data provide useful
constrains for the flavor decomposition in global fits of parton distribution
functions (PDF). The smallness of the cross-sections requires the use of
nuclear targets in the experimental setup. Understanding the nuclear
corrections is, for this reason, of utmost importance for a precise
determination of the PDFs. Here, we explore the nuclear effects in the
neutrino\antineutrino-nucleon DIS by comparing the NuTeV, CDHSW, and CHORUS
cross-sections to the predictions derived from the latest parton distribution
functions and their nuclear modifications. We obtain a good description of
these data and find no apparent disagreement between the nuclear effects in
neutrino DIS and those in charged lepton DIS. These results also indicate that
further improvements in the knowledge of the nuclear PDFs could be obtained by
a more extensive use of these sets of neutrino data.Comment: 16 pages, 8 figure
Three Dimensional Origin of AdS_2 Quantum Gravity

We study AdS_2 quantum gravity with emphasis on consistency with results from
AdS_3. We lift AdS_2 black holes to three dimensions and map fluctuations
around the solutions. Comparison with near extremal BTZ are discussed, with due
emphasis on global aspects. The results confirm that parameters like central
charges and conformal weights computed directly in 2D are consistent with
standard results in 3D. Applying our results to the thermodynamics of near
extreme Kerr black holes, we show that AdS_2 quantum gravity gives the correct
central charge c=12J, and the entropy of excitations above the extremal limit
is captured correctly.Comment: 28 page
A Definitive Signal of Multiple Supersymmetry Breaking

If the lightest observable-sector supersymmetric particle (LOSP) is charged
and long-lived, then it may be possible to indirectly measure the Planck mass
at the LHC and provide a spectacular confirmation of supergravity as a symmetry
of nature. Unfortunately, this proposal is only feasible if the gravitino is
heavy enough to be measured at colliders, and this condition is in direct
conflict with constraints from big bang nucleosynthesis (BBN). In this work, we
show that the BBN bound can be naturally evaded in the presence of multiple
sectors which independently break supersymmetry, since there is a new decay
channel of the LOSP to a goldstino. Certain regions of parameter space allow
for a direct measurement of LOSP decays into both the goldstino and the
gravitino at the LHC. If the goldstino/gravitino mass ratio is measured to be
2, as suggested by theory, then this would provide dramatic verification of the
existence of multiple supersymmetry breaking and sequestering. A variety of
consistent cosmological scenarios are obtained within this framework. In
particular, if an R symmetry is imposed, then the gauge-gaugino-goldstino
interaction vertices can be forbidden. In this case, there is no bound on the
reheating temperature from goldstino overproduction, and thermal leptogenesis
can be accommodated consistently with gravitino dark matter.Comment: 10 pages, 5 figures, title changed to match the version published in
  JHE
The non-Abelian gauge theory of matrix big bangs

We study at the classical and quantum mechanical level the time-dependent
Yang-Mills theory that one obtains via the generalisation of discrete
light-cone quantisation to singular homogeneous plane waves. The non-Abelian
nature of this theory is known to be important for physics near the
singularity, at least as far as the number of degrees of freedom is concerned.
We will show that the quartic interaction is always subleading as one
approaches the singularity and that close enough to t=0 the evolution is driven
by the diverging tachyonic mass term. The evolution towards asymptotically flat
space-time also reveals some surprising features.Comment: 29 pages, 8 eps figures, v2: minor changes, references added: v3
  small typographical changes
F-Theory GUT Vacua on Compact Calabi-Yau Fourfolds

We present compact three-generation F-theory GUT models meeting in particular
the constraints of D3-tadpole cancellation and D-term supersymmetry. To this
end we explicitly construct elliptically fibered Calabi-Yau fourfolds as
complete intersections in a toric ambient space. Toric methods enable us to
control the singular geometry of the SU(5) GUT model. The GUT brane wraps a
non-generic del Pezzo surface admitting GUT symmetry breaking via hypercharge
flux. It is contractible to a curve and we demonstrate the existence of a
consistent decoupling limit. We compute the Euler characteristic of the
singular Calabi-Yau fourfold to show that our three-generation flux solutions
obtained via the spectral cover construction are consistent with D3-tadpole
cancellation.Comment: 22+12 pages; v2: minor clarifications on decoupling limi
Note About Hamiltonian Formalism of Healthy Extended Horava-Lifshitz
  Gravity

In this paper we continue the study of the Hamiltonian formalism of the
healthy extended Horava-Lifshitz gravity. We find the constraint structure of
given theory and argue that this is the theory with the second class
constraints. Then we discuss physical consequence of this result. We also apply
the Batalin-Tyutin formalism of the conversion of the system with the second
class constraints to the system with the first class constraints to the case of
the healthy extended Horava-Lifshitz theory. As a result we find new theory of
gravity with structure that is different from the standard formulation of
Horava-Lifshitz gravity or General Relativity.Comment: 17 pages, v.2. references added, v.3. typos corrected, references
  adde
Hidden Conformal Symmetries of Five-Dimensional Black Holes

Recently it was shown by Castro, Maloney and Strominger (CMS) that 4D Kerr
black holes have a "hidden" conformal symmetry. Using some old results of
Cvetic and Larsen, I show that this result is very likely to hold also for the
most general black holes in five dimensions arising from heterotic/type II
string theory. In particular, we show how the wave equation in these geometries
in the "near region" can be written in terms of SL(2,R) X SL(2,R) Casimirs. For
the special case when the black hole has two spins but no U(1) charges,
detailed matches for entropy and absorption cross sections between CFT and
geometry are found. The black holes we consider need not be close to
extremality.Comment: 12 pages; preprint no. and refs added, typos fixe
Randall-Sundrum and Strings

We investigate stringy excitations in Randall-Sundrum effective theories for
electroweak symmetry breaking arising from embedding in string theory. RS is
dual to a confining gauge theory, which we expect to have "QCD strings," or
color flux tubes. Stringy constructions of RS-like theories allow us to
investigate the mass of these string states, which typically grows with a small
fractional power of the number of colors N of the dual gauge theory. There are
two known strong constraints on N for RS-like theories. The first arises from
demanding that the Standard Model gauge couplings do not have a Landau pole at
low scales. The second arises from demanding that the first-order confining
phase transition in the early universe is able to proceed without leaving an
empty universe, i.e. that the rate of bubble nucleation is not too small. We
find that these constraints on N imply that string states are generically at
most a factor of a few heavier than the lightest KK states, and we cannot
self-consistently remain in the limit N, lambda >> 1. We examine various string
constructions of AdS or RS-like backgrounds, including orbifolds, theories on
M5-branes, theories on D4-branes, and the recent F-theory construction of
Polchinski and Silverstein. In every case we find that there are strong bounds
on the mass of new stringy states. We briefly discuss important
phenomenological implications due to the presence of such light stringy
excitations, such as precision electroweak and flavor observables, as well as
collider signals.Comment: 35 pages, 2 figures. v2: References added, minor changes. (JHEP
  published version
The momentum analyticity of two-point correlators from perturbation
  theory and AdS/CFT

The momentum plane analyticity of two point function of a relativistic
thermal field theory at zero chemical potential is explored. A general
principle regarding the location of the singularities is extracted. In the case
of the N=4 supersymmetric Yang-Mills theory at large $N_c$, a qualitative
change in the nature of the singularity (branch points versus simple poles)
from the weak coupling regime to the strong coupling regime is observed with
the aid of the AdS/CFT correspondence.Comment: 18 pages, 3 figures, typos fixed, 1 figure update
SUSY dark matter in light of CDMS II results: a comparative study for
  different models

We perform a comparative study of the neutralino dark matter scattering on
nucleon in three popular supersymmetric models: the minimal (MSSM), the
next-to-minimal (NMSSM) and the nearly minimal (nMSSM). First, we give the
predictions of the elastic cross section by scanning over the parameter space
allowed by various direct and indirect constraints, which are from the
measurement of the cosmic dark matter relic density, the collider search for
Higgs boson and sparticles, the precision electroweak measurements and the muon
anomalous magnetic moment. Then we demonstrate the property of the allowed
parameter space with/without the new limits from CDMS II. We obtain the
following observations: (i) For each model the new CDMS limits can exclude a
large part of the parameter space allowed by current collider constraints; (ii)
The property of the allowed parameter space is similar for MSSM and NMSSM, but
quite different for nMSSM; (iii) The future SuperCDMS can cover most part of
the allowed parameter space for each model.Comment: 12 pages, 10 fig
The Tree Formula for MHV Graviton Amplitudes

We present and prove a formula for the MHV scattering amplitude of n
gravitons at tree level. Some of the more interesting features of the formula,
which set it apart as being significantly different from many more familiar
formulas, include the absence of any vestigial reference to a cyclic ordering
of the gravitons--making it in a sense a truly gravitational formula, rather
than a recycled Yang-Mills result, and the fact that it simultaneously
manifests both S_{n-2} symmetry as well as large-z behavior that is O(1/z^2)
term-by-term, without relying on delicate cancellations. The formula is
seemingly related to others by an enormous simplification provided by O(n^n)
iterated Schouten identities, but our proof relies on a complex analysis
argument rather than such a brute force manipulation. We find that the formula
has a very simple link representation in twistor space, where cancellations
that are non-obvious in physical space become manifest.Comment: 18 pages, v2: note adde
Parity Realization in Lattice QCD with Ginsparg-Wilson Fermions

The Vafa-Witten arguments on the realization of parity and flavour symmetries
in the QCD vacuum do not apply to two lattice regularizations of QCD which are
able to reproduce the chiral anomaly: Wilson fermions and Ginsparg-Wilson
fermions. We show here how using the last regularization one can get, from
first principles, that the more standard order parameters for these symmetries
take a vanishing vacuum expectation value for any number of flavours, if quarks
have a non-vanishing mass.Comment: 14 pages. References adde
CP-violation reach of an electron capture neutrino beam

This article extends the work of Bernabeu and Espinoza by examining the
CP-violation reach of a $^{150}$Dy electron capture beam through the variation
of the two Lorentz boosts, the number of useful electron capture decays, the
relative run time of each boost and the number of atmospheric backgrounds. The
neutrinos are assumed to be sourced at CERN with an upgraded SPS and are
directed towards a 440 kton Water Cerenkov detector located at the Canfranc
laboratory. Two large `CP-coverage' choices for the boost pairings are found; a
$\delta$-symmetrical coverage for $(\gamma_{1}, \gamma_{2})$ = (280, 160) and
an $\delta$-asymmetric coverage for $(\gamma_{1}, \gamma_{2})$ = (440,150).
With a nominal useful decay rate of $N_{\rm ions} = 10^{18}$ ions per year, the
$\delta$-symmetric setup can rule out CP-conservation down to
$\sin^{2}2\theta_{13} = 3\cdot 10^{-4}$. To reach $\sin^{2}2\theta_{13} =
1\cdot 10^{-3}$ for both $\delta < 0$ and $\delta > 0$ requires a useful decay
rate of $N_{\rm ions} = 6\cdot 10^{17}$ ions per year.Comment: 18 pages, 11 figures. Contains and extended analysis. Matches
  accepted JHEP versio
Non-equilibrium Condensation Process in a Holographic Superconductor

We study the non-equilibrium condensation process in a holographic
superconductor. When the temperature T is smaller than a critical temperature
T_c, there are two black hole solutions, the Reissner-Nordstrom-AdS black hole
and a black hole with a scalar hair. In the boundary theory, they can be
regarded as the supercooled normal phase and the superconducting phase,
respectively. We consider perturbations on supercooled Reissner-Nordstrom-AdS
black holes and study their non-linear time evolution to know about physical
phenomena associated with rapidly-cooled superconductors. We find that, for
T<T_c, the initial perturbations grow exponentially and, eventually, spacetimes
approach the hairy black holes. We also clarify how the relaxation process from
a far-from-equilibrium state proceeds in the boundary theory by observing the
time dependence of the superconducting order parameter. Finally, we study the
time evolution of event and apparent horizons and discuss their correspondence
with the entropy of the boundary theory. Our result gives a first step toward
the holographic understanding of the non-equilibrium process in
superconductors.Comment: 20 pages, 7 figure
Dark spinor models in gravitation and cosmology

We introduce and carefully define an entire class of field theories based on
non-standard spinors. Their dominant interaction is via the gravitational field
which makes them naturally dark; we refer to them as Dark Spinors. We provide a
critical analysis of previous proposals for dark spinors noting that they
violate Lorentz invariance. As a working assumption we restrict our analysis to
non-standard spinors which preserve Lorentz invariance, whilst being non-local
and explicitly construct such a theory. We construct the complete
energy-momentum tensor and derive its components explicitly by assuming a
specific projection operator. It is natural to next consider dark spinors in a
cosmological setting. We find various interesting solutions where the spinor
field leads to slow roll and fast roll de Sitter solutions. We also analyse
models where the spinor is coupled conformally to gravity, and consider the
perturbations and stability of the spinor.Comment: 43 pages. Several new sections and details added. JHEP in prin
Generalized hidden symmetries and the Kerr-Sen black hole

We elaborate on basic properties of generalized Killing-Yano tensors which
naturally extend Killing-Yano symmetry in the presence of skew-symmetric
torsion. In particular, we discuss their relationship to Killing tensors and
the separability of various field equations. We further demonstrate that the
Kerr-Sen black hole spacetime of heterotic string theory, as well as its
generalization to all dimensions, possesses a generalized closed conformal
Killing-Yano 2-form with respect to a torsion identified with the 3-form
occuring naturally in the theory. Such a 2-form is responsible for complete
integrability of geodesic motion as well as for separability of the scalar and
Dirac equations in these spacetimes.Comment: 33 pages, no figure
Holographic Roberge-Weiss Transitions

We investigate N=4 SYM coupled to fundamental flavours at nonzero imaginary
quark chemical potential in the strong coupling and large N limit, using
gauge/gravity duality applied to the D3-D7 system, treating flavours in the
probe approximation. The interplay between Z(N) symmetry and the imaginary
chemical potential yields a series of first-order Roberge-Weiss transitions. An
additional thermal transition separates phases where quarks are bound/unbound
into mesons. This results in a set of Roberge-Weiss endpoints: we establish
that these are triple points, determine the Roberge-Weiss temperature, give the
curvature of the phase boundaries and confirm that the theory is analytic in
mu^2 when mu^2~0.Comment: 37 pages, 13 figures; minor comments added, to appear in JHE