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arXiv:1708.08470
Date: Mon, 28 Aug 2017 18:01:19 GMT   (22kb,D)

Title: ${\rm BMS}_3$ invariant fluid dynamics at null infinity
Authors: Robert F. Penna
Categories: hep-th gr-qc
Comments: 12 pages
\\
  We revisit the boundary dynamics of asymptotically flat, three dimensional
gravity. The boundary is governed by a momentum conservation equation and an
energy conservation equation, which we interpret as fluid equations, following
the membrane paradigm. We reformulate the boundary's equations of motion as
Hamiltonian flow on the dual of an infinite-dimensional, semi-direct product
Lie algebra equipped with a Lie-Poisson bracket. This gives the analogue for
boundary fluid dynamics of the Marsden-Ratiu-Weinstein formulation of the
compressible Euler equations on a manifold, $M$, as Hamiltonian flow on the
dual of the Lie algebra of ${\rm Diff}(M)\ltimes C^\infty(M)$. The Lie group
for boundary fluid dynamics turns out to be ${\rm Diff}(S^1) \ltimes_{\rm Ad}
{\rm \mathfrak{vir}}$, with central charge $c=3/G$. This gives a new derivation
of the centrally extended, three-dimensional Bondi-van der Burg-Metzner-Sachs
(${\rm BMS}_3$) group. The relationship with fluid dynamics helps to streamline
and physically motivate the derivation. For example, the central charge,
$c=3/G$, is simply read off of a fluid equation in much the same way as one
reads off a viscosity coefficient. The perspective presented here may useful
for understanding the still mysterious four-dimensional BMS group.
\\ ( https://arxiv.org/abs/1708.08470 ,  22kb)
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arXiv:1708.08471
Date: Mon, 28 Aug 2017 18:02:12 GMT   (583kb,D)

Title: Menagerie of AdS$\boldsymbol{_2}$ boundary conditions
Authors: Daniel Grumiller, Robert McNees, Jakob Salzer, Carlos Valc\'arcel,
  Dmitri Vassilevich
Categories: hep-th gr-qc
Report-no: TUW-17-05
\\
  We consider different sets of AdS$_2$ boundary conditions for the
Jackiw-Teitelboim model in the linear dilaton sector where the dilaton is
allowed to fluctuate to leading order at the boundary of the Poincar\'e disk.
The most general set of boundary condtions is easily motivated in the gauge
theoretic formulation as a Poisson sigma model and has an $\mathfrak{sl}(2)$
current algebra as asymptotic symmetries. Consistency of the variational
principle requires a novel boundary counterterm in the holographically
renormalized action, namely a kinetic term for the dilaton. The on-shell action
can be naturally reformulated as a Schwarzian boundary action. While there can
be at most three canonical boundary charges on an equal-time slice, we consider
all Fourier modes of these charges with respect to the Euclidean boundary time
and study their associated algebras. Besides the (centerless)
$\mathfrak{sl}(2)$ current algebra we find for stricter boundary conditions a
Virasoro algebra, a warped conformal algebra and a $\mathfrak{u}(1)$ current
algebra. In each of these cases we get one half of a corresponding symmetry
algebra in three-dimensional Einstein gravity with negative cosmological
constant and analogous boundary conditions. However, on-shell some of these
algebras reduce to finite-dimensional ones, reminiscent of the on-shell
breaking of conformal invariance in SYK. We conclude with a discussion of
thermodynamical aspects, in particular the entropy and some Cardyology.
\\ ( https://arxiv.org/abs/1708.08471 ,  583kb)
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arXiv:1708.08472
Date: Mon, 28 Aug 2017 18:08:26 GMT   (261kb)

Title: ABJ Quadrality
Authors: Masazumi Honda, Yi Pang, Yaodong Zhu
Categories: hep-th gr-qc
Comments: 37+15 pages, 4 figures
Report-no: WIS/01/17-AUG-DPPA
\\
  We study physical consequences of adding orientifolds to the ABJ triality,
which is among 3d N=6 superconformal Chern-Simons theory known as ABJ theory,
type IIA string in AdS_4 x CP^3 and N=6 supersymmetric (SUSY) Vasiliev higher
spin theory in AdS_4. After adding the orientifolds, it is known that the gauge
group of the ABJ theory becomes O(N_1)xUSp(2N_2) while the background of the
string theory is replaced by AdS_4 x CP^3/Z_2, and the supersymmetries in the
both theories reduce to N=5. We propose that adding the orientifolds to the N=6
Vasiliev theory leads to N=5 SUSY Vasiliev theory. It turns out that the N=5
case is more involved because there are two formulations of the N=5 Vasiliev
theory with either O or USp internal symmetry. We show that the two N=5
Vasiliev theories can be understood as certain projections of the N=6 Vasiliev
theory, which we identify with the orientifold projections in the Vasiliev
theory. We conjecture that the O(N_1)xUSp(2N_2) ABJ theory has the two vector
model like limits: N_2 >> N_1 and N_1 >> N_2 which correspond to the
semi-classical N=5 Vasiliev theories with O(N_1) and USp(2N_2) internal
symmetries respectively. These correspondences together with the standard
AdS/CFT correspondence comprise the ABJ quadrality among the N=5 ABJ theory,
string/M-theory and two N=5 Vasliev theories. We provide a precise holographic
dictionary for the correspondences by comparing correlation functions of stress
tensor and flavor currents. Our conjecture is supported by various evidence
such as agreements of the spectra, one-loop free energies and SUSY enhancement
on the both sides. We also predict the leading free energy of the N=5 Vasiliev
theory from the CFT side. As a byproduct, we give a derivation of the relation
between the parity violating phase in the N=6 Vasiliev theory and the
parameters in the N=6 ABJ theory, which was conjectured in arXiv:1207.4485.
\\ ( https://arxiv.org/abs/1708.08472 ,  261kb)
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arXiv:1708.08477
Date: Mon, 28 Aug 2017 18:34:31 GMT   (1452kb,D)

Title: Black hole elasticity and gapped transverse phonons in holography
Authors: Lasma Alberte, Martin Ammon, Matteo Baggioli, Amadeo Jim\'enez, Oriol
  Pujol\`as
Categories: hep-th
Comments: 27 pages, 7 figures
Report-no: CCTP-2017-4, ITCP-IPP 2017/15
\\
  We study the elastic response of planar black hole (BH) solutions in a simple
class of holographic models with broken translational invariance. We compute
the transverse quasi-normal mode spectrum and determine the propagation speed
of the lowest energy mode. We find that the sound speed of the transverse
phonons relates to the BH rigidity modulus, as dictated by the elasticity
theory. This allows us to interpret these modes as the pseudo-Goldstone bosons
of the spontaneously broken translational invariance. In addition, we show that
these modes have a mass gap controlled by an explicit source of the
translational symmetry breaking. These results provide a new confirmation that
the BHs in these models do exhibit solid properties that become more manifest
at low temperatures. Also, by the AdS/CFT correspondence, this allows to extend
the standard results from the effective field theory for solids to
quantum-critical materials.
\\ ( https://arxiv.org/abs/1708.08477 ,  1452kb)
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arXiv:1708.08512
Date: Mon, 28 Aug 2017 20:33:13 GMT   (231kb,D)

Title: Kinklike structures in models of the Dirac-Born-Infeld type
Authors: D. Bazeia, Elisama E.M. Lima, L. Losano
Categories: hep-th math-ph math.MP
Comments: 12 pages, 8 figures
\\
  The present work investigates several models of a single real scalar field,
engendering kinetic term of the Dirac-Born-Infeld type. Such theories introduce
nonlinearities to the kinetic part of the Lagrangian, which presents a square
root restricting the field evolution and including additional powers in
derivatives of the scalar field, controlled by a real parameter. In order to
obtain topological solutions analytically, we propose a first-order framework
that simplifies the equation of motion ensuring solutions that are linearly
stables. This is implemented using the deformation method, and we introduce
examples presenting two categories of potentials, one having polynomial
interactions and the other with nonpolynomial interactions. We also explore how
the Dirac-Born-Infeld kinetic term affects the properties of the solutions. In
particular, we note that the kinklike solutions are the same as the ones
obtained through models with standard kinetic term and canonical potential, but
their energy densities and stability potentials vary according to the parameter
introduced to control the new models.
\\ ( https://arxiv.org/abs/1708.08512 ,  231kb)
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arXiv:1708.08561
Date: Mon, 28 Aug 2017 23:41:04 GMT   (11kb,D)

Title: Puzzles and pitfalls involving Haar-typicality inholography
Authors: Ning Bao and Aidan Chatwin-Davies
Categories: hep-th gr-qc quant-ph
Comments: 8 pages
\\
  Typical holographic states that have a well-defined geometric dual in
AdS/CFTare not typical with respect to the Haar measure. As such, trying to
apply principles andlessons from Haar-random ensembles of states to holographic
states can lead to apparentpuzzles and contradictions. We point out a handful
of these pitfalls.
\\ ( https://arxiv.org/abs/1708.08561 ,  11kb)
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arXiv:1708.08642
Date: Tue, 29 Aug 2017 08:46:02 GMT   (54kb,D)

Title: The complex side of the TS/ST correspondence
Authors: Alba Grassi, Marcos Marino
Categories: hep-th math-ph math.AG math.MP math.SP
Comments: 22 pages, 2 figures
\\
  The TS/ST correspondence relates the spectral theory of certain quantum
mechanical operators, to topological strings on toric Calabi-Yau threefolds. So
far the correspondence has been formulated for real values of Planck's
constant. In this paper we start to explore the validity of the correspondence
when $\hbar$ takes complex values. We give evidence that, for threefolds
associated to supersymmetric gauge theories, one can extend the correspondence
and obtain exact quantization conditions for the operators. We also explore the
correspondence for operators involving periodic potentials. In particular, we
study a deformed version of the Mathieu equation, and we solve for its band
structure in terms of the quantum mirror map of the underlying threefold.
\\ ( https://arxiv.org/abs/1708.08642 ,  54kb)
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arXiv:1708.08654
Date: Tue, 29 Aug 2017 09:23:07 GMT   (145kb)

Title: Extremal Vanishing Horizon Kerr-AdS Black Holes at Ultraspinning Limit
Authors: S.M. Noorbakhsh and M.H. Vahidinia
Categories: hep-th gr-qc
Comments: 29 pages, 3 figures
\\
  By utilizing the ultraspinning limit we generate a new class of extremal
vanishing horizon (EVH) black holes in odd dimensions ($d\geq5$). Starting from
the general multi-spinning Kerr-AdS metrics, we show the EVH limit commutes
with the ultraspinning limit, in which the resulting solutions possess a
non-compact but finite area manifold for all $(t,r\neq r_+)=const.$ slices. We
also demonstrate the near horizon geometries of obtained ultraspinning EVH
solutions contain an AdS$_3$ throats, where it would be a BTZ black hole in the
near EVH cases. The commutativity of the ultraspinning and near horizon limits
for EVH solutions is confirmed as well. Furthermore, we discuss only
five-dimensional case near the EVH point can be viewed as a super-entropic
black hole. We also show that the thermodynamics of the obtained solutions
agree with the BTZ black hole. Moreover we investigate the EVH/CFT proposal,
demonstrating the entropy of $2$d dual CFT and Bekenstein-Hawking entropy are
equivalent.
\\ ( https://arxiv.org/abs/1708.08654 ,  145kb)
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arXiv:1708.08657
Date: Tue, 29 Aug 2017 09:30:28 GMT   (897kb,D)

Title: Correlators in higher spin AdS_3 holography from Wilson lines with loop
  corrections
Authors: Yasuaki Hikida and Takahiro Uetoko
Categories: hep-th
Comments: 35 pages, 7 figures
Report-no: YITP-17-92
\\
  We study the correlators of 2d W_N minimal model in the semiclassical regime
with large central charge from bulk viewpoint by utilizing open Wilson lines in
sl(N) Chern-Simons gauge theory. We extend previous works for the tree level of
bulk theory to incorporate loop corrections in this paper. We offer a way to
regularize divergences associated with loop diagrams such that three point
functions with two scalars and a higher spin current agree with the values
fixed by the boundary W_N symmetry. With the prescription, we reproduce the
conformal weight of operator corresponding to a bulk scalar up to the two loop
order for explicit examples with N=2,3.
\\ ( https://arxiv.org/abs/1708.08657 ,  897kb)
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arXiv:1708.08668
Date: Tue, 29 Aug 2017 09:52:33 GMT   (36kb)

Title: Feynman rules for higher-spin gauge fields on AdS$_{d+1}$
Authors: Charlotte Sleight, Massimo Taronna
Categories: hep-th
Comments: 32 pages
\\
  We determine the Feynman rules for the minimal type A higher-spin gauge
theory on AdS$_{d+1}$ at cubic order. In particular, we establish the quantum
action at cubic order in de Donder gauge, including ghosts. We also give the
full de Donder gauge propagators of higher-spin gauge fields and their ghosts.
This provides all ingredients needed to quantise the theory at cubic order.
\\ ( https://arxiv.org/abs/1708.08668 ,  36kb)
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arXiv:1708.08686
Date: Tue, 29 Aug 2017 10:39:08 GMT   (42kb,D)

Title: Gregory-Laflamme analysis of MGD black strings
Authors: A. Fernandes-Silva, R. da Rocha
Categories: hep-th gr-qc
Comments: 8 pages, 1 figure
\\
  The minimal geometric deformation (MGD), associated with the 4D Schwarzschild
solution of the Einstein equations, is shown to be a solution of the pure 4D
Ricci quadratic gravity theory, whose linear perturbations are then implemented
by the Gregory-Laflamme eigentensors of the Lichnerowicz operator. The
stability of MGD black strings is hence studied, through the correspondence
between their Lichnerowicz eigenmodes and the ones associated with the 4D MGD
solutions. Its is shown that there exists a critical mass driving the MGD black
strings stability, above which the MGD black string is precluded from any
Gregory-Laflamme instability. The general relativistic limit leads the MGD
black string to be unstable, as expected, corresponding to the standard
Gregory-Laflamme black string instability.
\\ ( https://arxiv.org/abs/1708.08686 ,  42kb)
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arXiv:1708.08701
Date: Tue, 29 Aug 2017 11:24:46 GMT   (172kb,D)

Title: Labelled tree graphs, Feynman diagrams and disk integrals
Authors: Xiangrui Gao, Song He, Yong Zhang
Categories: hep-th
Comments: 30+8 pages, many figures
\\
  In this note, we introduce and study a new class of "half integrands" in
Cachazo-He-Yuan (CHY) formula, which naturally generalize the so-called
Parke-Taylor factors; these are dubbed Cayley functions as each of them
corresponds to a labelled tree graph. The CHY formula with a Cayley function
squared gives a sum of Feynman diagrams, and we represent it by a combinatoric
polytope whose vertices correspond to Feynman diagrams. We provide a simple
graphic rule to derive the polytope from a labelled tree graph, and classify
such polytopes ranging from the associahedron to the permutohedron.
Furthermore, we study the linear space of such half integrands and find (1) a
nice formula reducing any Cayley function to a sum of Parke-Taylor factors in
the Kleiss-Kuijf basis (2) a set of Cayley functions as a new basis of the
space; each element has the remarkable property that its CHY formula with a
given Parke-Taylor factor gives either a single Feynman diagram or zero. We
also briefly discuss applications of Cayley functions and the new basis in
certain disk integrals of superstring theory.
\\ ( https://arxiv.org/abs/1708.08701 ,  172kb)
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arXiv:1708.08713
Date: Tue, 29 Aug 2017 11:57:56 GMT   (10kb,D)

Title: Averaged Energy Conditions and Bouncing Universes
Authors: Massimo Giovannini
Categories: hep-th astro-ph.CO gr-qc hep-ph
Comments: 9 pages
\\
  The dynamics of bouncing universes is characterized by violating certain
coordinate invariant restrictions on the total energy-momentum tensor,
customarily referred to as energy conditions. Although there could be epochs
where the null energy condition is locally violated, it may perhaps be enforced
in an averaged sense. Explicit examples of this possibility are investigated in
different frameworks.
\\ ( https://arxiv.org/abs/1708.08713 ,  10kb)
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arXiv:1708.08727
Date: Tue, 29 Aug 2017 12:40:02 GMT   (10kb)

Title: On divergences in non-minimal N=4 conformal supergravity
Authors: A. A. Tseytlin
Categories: hep-th
Comments: 6 pages
Report-no: Imperial-TP-AT-2017-08
\\
  We review the question of quantum consistency of N=4 conformal supergravity
in 4 dimensions. The UV divergences and anomalies of the standard ("minimal")
conformal supergravity where the complex scalar $\phi$ is not coupled to the
Weyl graviton kinetic term can be cancelled by coupling this theory to N=4
super Yang-Mills with gauge group of dimension 4. The same turns out to be true
also for the "non-minimal" N=4 conformal supergravity with the action (recently
constructed in arXiv:1609.09083) depending on an arbitrary holomorphic function
$f(\phi)$. The special case of the "non-minimal" conformal supergravity with
$f= e^{2\phi}$ appears in the twistor-string theory. We show that divergences
and anomalies do not depend on the form of the function $f$ and thus can be
cancelled just as in the "minimal" $f=1$ case by coupling the theory to four
N=4 vector multiplets.
\\ ( https://arxiv.org/abs/1708.08727 ,  10kb)
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arXiv:1708.08730
Date: Tue, 29 Aug 2017 12:59:51 GMT   (15kb)

Title: Vacuum energy via dimensional reduction of functional determinants
Authors: Cesar D. Fosco and Francisco D. Mazzitelli
Categories: hep-th math-ph math.MP
Comments: 19 pages, no figures
\\
  We apply a `dimensional reduction' mechanism to the evaluation of the
functional integral for the vacuum energy of a real scalar field in the
presence of non-trivial backgrounds, in d+1 dimensions. The reduction is
implemented by applying a generalized version of Gelfand-Yaglom's theorem to
the corresponding functional determinant. The main outcome of that procedure is
an alternative representation for the Casimir energy, which involves one
spatial dimension less than the original problem. We show that, for some
configurations, important information about the reduced problem can be
obtained. We also show that the reduced problem allows for the introduction of
an approximation scheme which is novel within this context.
\\ ( https://arxiv.org/abs/1708.08730 ,  15kb)
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arXiv:1708.08767
Date: Sat, 26 Aug 2017 11:29:44 GMT   (15kb)

Title: General formulas for conserved charges and black hole entropy in
  Chern-Simons-like theories of gravity
Authors: M. R. Setare, H. Adami
Categories: hep-th
\\
  This paper deals with the problem of defining off-shell conserved charges in
a set of theories known as Chern-Simons-like theories of gravity (CSLTG). The
method is derived in a general way, which may find applications in a wide set
of theories, and then specified to the case of Generalized minimal massive
gravity (GMMG), where known results of the central charge and black hole
entropy are reproduced. The results for the charges are useful to the community
and can be applied to all three-dimensional gravity theories within the class
of CSLTG which includes almost all of them. The given specific examples show a
consistency check of the more general method.
\\ ( https://arxiv.org/abs/1708.08767 ,  15kb)
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arXiv:1708.08769
Date: Sat, 26 Aug 2017 16:51:48 GMT   (15kb)

Title: Quantum vacuum, dark matter, dark energy and spontaneous supersymmetry
  breaking
Authors: Antonio Capolupo
Categories: hep-th
Comments: 7 pages
\\
  We study the vacuum condensate characterizing many physical phenomena. We
show that such a condensate may leads to non-trivial components of the dark
energy and of the dark matter and may induces the spontaneous supersymmetry
breaking, in a supersymmetric context. In particular, we consider the
condensate induced by thermal states, fields in curved space-time and mixed
particles.
\\ ( https://arxiv.org/abs/1708.08769 ,  15kb)
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arXiv:1708.08805
Date: Tue, 29 Aug 2017 15:00:01 GMT   (415kb)

Title: Large-N CP(N-1) sigma model on a finite interval and the renormalized
  string energy
Authors: Alessandro Betti, Stefano Bolognesi, Sven Bjarke Gudnason, Kenichi
  Konishi, Keisuke Ohashi
Categories: hep-th hep-lat
Comments: LaTeX: 28 pages, 8 figures
Report-no: IFUP-TH-2017
\\
  We continue the analysis started in a recent paper of the large-N
two-dimensional CP(N-1) sigma model, defined on a finite space interval L with
Dirichlet (or Neumann) boundary conditions. Here we focus our attention on the
problem of the renormalized energy density $\mathcal{E}(x,\Lambda,L)$ which is
found to be a sum of two terms, a constant term coming from the sum over modes,
and a term proportional to the mass gap. The approach to
$\mathcal{E}(x,\Lambda,L)\to\tfrac{N}{4\pi}\Lambda^2$ at large $L\Lambda$ is
shown, both analytically and numerically, to be exponential: no power
corrections are present and in particular no L\"uscher term appears. This is
consistent with the earlier result which states that the system has a unique
massive phase, which interpolates smoothly between the classical weakly-coupled
limit for $L\Lambda\to 0$ and the "confined" phase of the standard CP(N-1)
model in two dimensions for $L\Lambda\to\infty$.
\\ ( https://arxiv.org/abs/1708.08805 ,  415kb)
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arXiv:1708.08807
Date: Tue, 29 Aug 2017 15:00:42 GMT   (1421kb)

Title: Casimir Force for the ${\mathbb C}P^{N-1}$ Model
Authors: Antonino Flachi, Muneto Nitta, Satoshi Takada, Ryosuke Yoshii
Categories: hep-th cond-mat.supr-con
Comments: 6 pages, 3 figures
\\
  In this work, we derive exact self-consistent solutions to the gap equations
of the $\mathbb{C}P^{N-1}$ model on a finite interval with Dirichlet boundary
conditions in the large-$N$ approximation. We find two classes of solutions
describing an unbroken-confining phase and a broken-Higgs phase, favoured for
larger and smaller sizes of the system, respectively. We compute the vacuum
energy and the Casimir force and observe that the sign of the force is
attractive in the Higgs phase, while it can change from repulsive to attractive
in the confining phase.
\\ ( https://arxiv.org/abs/1708.08807 ,  1421kb)
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arXiv:1708.08815
Date: Tue, 29 Aug 2017 15:13:34 GMT   (2613kb,D)

Title: Modular Constraints on Conformal Field Theories with Currents
Authors: Jin-Beom Bae, Sungjay Lee, Jaewon Song
Categories: hep-th
Comments: 49 pages, 23 figures
\\
  We study constraints coming from the modular invariance of the partition
function of two-dimensional conformal field theories. We constrain the spectrum
of CFTs in the presence of holomorphic and anti-holomorphic currents using the
semi-definite programming. In particular, we find the bounds on the twist gap
for the non-current primaries depend dramatically on the presence of
holomorphic currents, showing numerous kinks and peaks. Various rational CFTs
are realized at the numerical boundary of the twist gap, saturating the upper
limits on the degeneracies. Such theories include Wess-Zumino-Witten models for
the Deligne's exceptional series, the Monster CFT and the Baby Monster CFT. We
also study modular constraints imposed by $\mathcal{W}$-algebras of various
type and observe that the bounds on the gap depend on the choice of
$\mathcal{W}$-algebra in the small central charge region.
\\ ( https://arxiv.org/abs/1708.08815 ,  2613kb)
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arXiv:1708.08821
Date: Tue, 29 Aug 2017 15:25:44 GMT   (1668kb,D)

Title: String tensions in deformed Yang-Mills theory
Authors: Erich Poppitz and M. Erfan Shalchian T
Categories: hep-th hep-lat
Comments: 69 pages, 6 figures
\\
  We study k-strings in deformed Yang-Mills (dYM) with SU(N) gauge group in the
semiclassically calculable regime on $R^3 \times S^1$. Their tensions
T$_{\text{k}}$ are computed in two ways: numerically, for $2$ $\le$ N $\le$
$10$, and via an analytic approach using a re-summed perturbative expansion.
The latter serves both as a consistency check on the numerical results and as a
tool to analytically study the large-N limit. We find that dYM k-string ratios
T$_{\text{k}}$/T$_{\text{1}}$ do not obey the well-known sine- or
Casimir-scaling laws. Instead, we show that the ratios
T$_{\text{k}}$/T$_{\text{1}}$ are bound above by a square root of Casimir
scaling, previously found to hold for stringlike solutions of the MIT Bag
Model. The reason behind this similarity is that dYM dynamically realizes, in a
theoretically controlled setting, the main model assumptions of the Bag Model.
We also compare confining strings in dYM and in other four-dimensional theories
with abelian confinement, notably Seiberg-Witten theory, and show that the
unbroken $Z_N$ center symmetry in dYM leads to different properties of
k-strings in the two theories. Our results also indicate that, at large values
of N, k-strings in dYM do not become free.
\\ ( https://arxiv.org/abs/1708.08821 ,  1668kb)
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arXiv:1708.08822
Date: Tue, 29 Aug 2017 15:27:26 GMT   (1677kb,D)

Title: Thermal diffusivity and butterfly velocity in anisotropic Q-Lattice
  models
Authors: Dujin Ahn, Yongjun Ahn, Hyun-Sik Jeong, Keun-Young Kim, Wei-Jia Li,
  and Chao Niu
Categories: hep-th cond-mat.str-el
Comments: 32 pages, 1 figure
\\
  By using a holographic method we study a relation between the thermal
diffusivity ($D_T$) and two quantum chaotic properties, Lyapunov time
($\tau_L$) and butterfly velocity ($v_B$) in strongly correlated systems. It
has been shown that $D_T/(v_B^2 \tau_L)$ is universal in some holographic
models as well as condensed matter systems including the Sachdev-Ye-Kitaev
(SYK) models. We investigate to what extent this relation is universal in the
Q-lattice models with infrared scaling geometry, focusing on the effect of
spatial anisotropy. Indeed it was shown that $\mathcal{E}_i :=
D_{T,i}/(v_{B,i}^2 \tau_L)$ ($i=x,y$) is determined only by some scaling
exponents of the IR metric in the low temperature limit regardless of the
matter fields and ultraviolet data. Built on this observation, in this work, we
find the concrete expressions of $\mathcal{E}_i$ in terms of the critical
dynamical exponents $z_i$ for each direction. By analyzing the IR scaling
geometry we identify the allowed scaling parameter regimes, which enable us to
compute the allowed range of $\mathcal{E}_i$. We find the lower bound of
$\mathcal{E}_i$ is always $1/2$, which is not affected by anisotropy contrary
to the $\eta/s$ case. However, there may be an upper bound determined by
anisotropy.
\\ ( https://arxiv.org/abs/1708.08822 ,  1677kb)
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arXiv:1708.08827
Date: Tue, 29 Aug 2017 15:37:20 GMT   (13kb)

Title: Generalized Pure Lovelock Gravity
Authors: Patrick Concha, Evelyn Rodr\'iguez
Categories: hep-th gr-qc
Comments: 15 pages
\\
  We present a generalization of the n-dimensional (pure) Lovelock Gravity
theory based on an enlarged Lorentz symmetry. In particular, we propose an
alternative way to introduce a cosmological term. Interestingly, we show that
the usual pure Lovelock gravity is recovered in a matter-free configuration.
The five and six-dimensional cases are explicitly studied.
\\ ( https://arxiv.org/abs/1708.08827 ,  13kb)
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arXiv:1708.07998 (*cross-listing*)
Date: Sat, 26 Aug 2017 17:24:32 GMT   (29kb,D)

Title: Fourier series of modular graph functions
Authors: Eric D'Hoker and William Duke
Categories: math.NT hep-th
Comments: 34 pages
\\
  Modular graph functions associate to a graph an $SL(2,Z)$-invariant function
on the upper half plane. We obtain the Fourier series of modular graph
functions of arbitrary weight $w$ and two-loop order. The motivation for this
work is to develop a deeper understanding of the origin of the algebraic
identities between modular graph functions which have been discovered recently,
and of the relation between the existence of these identities and the
occurrence of cusp forms. We show that the constant Fourier mode, as a function
of the modulus $\tau$, consists of a Laurent polynomial in $y = \pi \, {\rm Im}
(\tau)$ of degree $(w,1-w)$, plus a contribution which decays exponentially as
$y \to \infty$. The Laurent polynomial is a linear combination with rational
coefficients of the top term $y^w$, and lower order terms $\zeta (2k+1)
y^{w-2k-1}$ for $1\leq k \leq w-1$, as well as terms $\zeta (2w-2\ell-3) \zeta
(2\ell+1)y^{2-w}$ for $1 \leq \ell \leq w-3$. The exponential contribution is a
linear combination of exponentials of $y$ and incomplete $\Gamma$-functions
whose coefficients are Laurent polynomials in $y$ with rational coefficients.
\\ ( https://arxiv.org/abs/1708.07998 ,  29kb)
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arXiv:1708.08507 (*cross-listing*)
Date: Mon, 28 Aug 2017 20:17:30 GMT   (1204kb,D)

Title: Simple $\mathbb{Z}_2$ lattice gauge theories at finite fermion density
Authors: Christian Prosko, Shu-Ping Lee, Joseph Maciejko
Categories: cond-mat.str-el hep-lat hep-th
Comments: 24 pages, 13 figures
\\
  Lattice gauge theories are a powerful language to theoretically describe a
variety of strongly correlated systems, including frustrated magnets,
high-$T_c$ superconductors, and topological phases. However, in many cases
gauge fields couple to gapless matter degrees of freedom and such theories
become notoriously difficult to analyze quantitatively. In this paper we study
several examples of $\mathbb{Z}_2$ lattice gauge theories with gapless fermions
at finite density, in one and two spatial dimensions, that are either exactly
soluble or whose solution reduces to that of a known problem. We consider
complex fermions (spinless and spinful) as well as Majorana fermions, and study
both theories where Gauss' law is strictly imposed and those where all
background charge sectors are kept in the physical Hilbert space. We use a
combination of duality mappings and the $\mathbb{Z}_2$ slave-spin
representation to map our gauge theories to models of gauge-invariant fermions
that are either free, or with on-site interactions of the Hubbard or
Falicov-Kimball type that are amenable to further analysis. In 1D, the phase
diagrams of these theories include free-fermion metals, insulators, and
superconductors; Luttinger liquids; and correlated insulators. In 2D, we find a
variety of gapped and gapless phases, the latter including uniform and
spatially modulated flux phases featuring emergent Dirac fermions, some
violating Luttinger's theorem.
\\ ( https://arxiv.org/abs/1708.08507 ,  1204kb)
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\\
arXiv:1708.08733 (*cross-listing*)
Date: Tue, 29 Aug 2017 13:11:39 GMT   (10kb)

Title: Note on relation between bottom-up holographic models and large-Nc QCD
Authors: S.S. Afonin
Categories: hep-ph hep-th
Comments: 12 pages
\\
  We discuss a derivation of the quadratic in fields part of action of
bottom-up holographic models from some general properties of the large-Nc limit
in QCD. The importance of rescaling of five-dimensional fields is emphasized
using the soft wall model as an example.
\\ ( https://arxiv.org/abs/1708.08733 ,  10kb)
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\\
arXiv:1708.08766 (*cross-listing*)
Date: Sat, 26 Aug 2017 08:12:29 GMT   (23kb)

Title: Generalized plane waves in Poincar\'e gauge theory of gravity
Authors: Milutin Blagojevi\'c, Branislav Cvetkovi\'c, Yuri N. Obukhov
Categories: gr-qc hep-th
Comments: 13 pages, Rextex, accepted in Phys. Rev. D. Paper is dedicated to
  Friedrich Hehl on the occasion of his 80th birthday, in appreciation of his
  contribution to the development of gauge theories of gravity. arXiv admin
  note: text overlap with arXiv:1702.05185
\\
  A family of exact vacuum solutions, representing generalized plane waves
propagating on the (anti-)de Sitter background, is constructed in the framework
of Poincar\'e gauge theory. The wave dynamics is defined by the general
Lagrangian that includes all parity even and parity odd invariants up to the
second order in the gauge field strength. The structure of the solution shows
that the wave metric significantly depends on the spacetime torsion.
\\ ( https://arxiv.org/abs/1708.08766 ,  23kb)
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arXiv:1708.08774 (*cross-listing*)
Date: Tue, 29 Aug 2017 14:28:25 GMT   (10kb)

Title: Boosted Schwarzschild Metrics from a Kerr-Schild Perspective
Authors: Thomas M\"adler and Jeffrey Winicour
Categories: gr-qc hep-th
Comments: 10 pages
\\
  The Kerr-Schild version of the Schwarzschild metric contains a Minkowski
background which provides a definition of a boosted black hole. There are two
Kerr-Schild versions corresponding to ingoing or outgoing principle null
directions. We show that the two corresponding Minkowski backgrounds and their
associated boosts have an unexpected difference. We analyze this difference and
discuss the implications in the nonlinear regime for the gravitational memory
effect resulting from the ejection of massive particles from an isolated
system.
\\ ( https://arxiv.org/abs/1708.08774 ,  10kb)
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\\
arXiv:1708.08849 (*cross-listing*)
Date: Tue, 29 Aug 2017 16:04:29 GMT   (13kb,D)

Title: On the existence of the field line solutions of the Einstein-Maxwell
  equations
Authors: Ion V. Vancea
Categories: gr-qc astro-ph.CO hep-th
Comments: 14 pages
\\
  The main result of this paper is the proof that there are local electric and
magnetic field configurations expressed in terms of field lines on an arbitrary
hyperbolic manifold. This electromagnetic field is described by (dual)
solutions of the Maxwell equations of the Einstein-Maxwell theory. These
solutions have the following important properties: i) they are general, in the
sense that the knot solutions are particular cases of them and ii) they reduce
to the general electromagnetic fields in the field line representation in the
flat space-time. Also, we discuss briefly the real representation of these
electromagnetic configurations and write down the Einstein equations.
\\ ( https://arxiv.org/abs/1708.08849 ,  13kb)
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\\
arXiv:1708.08868 (*cross-listing*)
Date: Tue, 29 Aug 2017 16:38:36 GMT   (2857kb,D)

Title: Black hole fusion in the extreme mass ratio limit
Authors: Roberto Emparan, Marina Martinez, Miguel Zilhao
Categories: gr-qc hep-th
Comments: 35 pages, 18 figures
\\
  We present a simple, general, and accurate construction of the event horizons
for the fusion of two neutral, rotating black holes with arbitrary orientation
and values of their spins, in the extreme mass ratio limit where one black hole
is much larger than the other. We compute several parameters that characterize
the fusion and investigate their dependence on the black hole spin and
orientation axis. We also exhibit and study the appearance of transient
toroidal topology of the horizon. An earlier conjecture about universal
critical exponents before and after an axisymmetric pinch is proven.
\\ ( https://arxiv.org/abs/1708.08868 ,  2857kb)
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\\
arXiv:1708.08878 (*cross-listing*)
Date: Tue, 29 Aug 2017 17:02:01 GMT   (773kb,D)

Title: A Convolutional Neural Network For Cosmic String Detection in CMB
  Temperature Maps
Authors: Razvan Ciuca, Oscar F. Hern\'andez, Michael Wolman
Categories: astro-ph.CO gr-qc hep-ph hep-th
Comments: 12 pages, 6 figures
\\
  We present the convolutional neural network used in reference [11] to detect
cosmic strings in Cosmic Microwave Background (CMB) temperature anisotropy
maps. By training our neural network on numerically generated CMB temperature
maps with and without cosmic strings the network can produce prediction maps
that locate the position of the cosmic strings and provide a probabilistic
estimate of the value of the string tension $G\mu$. The network as applied to
noiseless simulations of CMB maps with arcminute resolution was able to locate
strings and accurately determine the value of the string tension for sky maps
having strings with string tension as low as $G\mu=5\times10^{-9}$.
\\ ( https://arxiv.org/abs/1708.08878 ,  773kb)
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arXiv:1109.2064 (*cross-listing*)
replaced with revised version Tue, 29 Aug 2017 16:58:28 GMT   (36kb)

Title: Thermal States in Conformal QFT. II
Authors: Paolo Camassa, Roberto Longo, Yoh Tanimoto, Mihaly Weiner
Categories: math-ph hep-th math.MP math.OA
Comments: 36 pages, no figure. Dedicated to Rudolf Haag on the occasion of his
  90th birthday. The final version is available under Open Access. This paper
  contains corrections to the Araki-Haag-Kaster-Takesaki theorem (and to a
  proof of the same theorem in the book by Bratteli-Robinson). v3: a reference
  corrected
MSC-class: 81T40 81T05 46L60
Journal-ref: Commun. Math. Phys. Vol. 315, No. 3 (2012), 771-802
DOI: 10.1007/s00220-012-1514-z
\\ ( https://arxiv.org/abs/1109.2064 ,  36kb)
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\\
arXiv:1606.05959
replaced with revised version Tue, 29 Aug 2017 05:15:47 GMT   (2130kb,D)

Title: Hyperscaling violating black hole solutions and Magneto-thermoelectric
  DC conductivities in holography
Authors: Xian-Hui Ge, Yu Tian, Shang-Yu Wu, Shao-Feng Wu
Categories: hep-th cond-mat.str-el
Comments: 10 pages, two figures, major revision, published version
Journal-ref: Phys. Rev. D 96 (2017) 046015
\\ ( https://arxiv.org/abs/1606.05959 ,  2130kb)
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\\
arXiv:1610.00555 (*cross-listing*)
replaced with revised version Tue, 29 Aug 2017 10:10:15 GMT   (386kb,D)

Title: Gravitational birefringence of light in Robertson-Walker cosmologies
Authors: C. Duval and T. Schucker
Categories: gr-qc astro-ph.CO hep-th physics.optics
Comments: 28 pages, 7 figures; version 2: curvature added in eq. (3.11) and
  sign corrected in eq. (5.16); version 3: changed sign convention for Riemann
  tensor, completed proof in appendix, various clarifications added in the text
Journal-ref: Phys. Rev. D 96, 043517 (2017)
DOI: 10.1103/PhysRevD.96.043517
\\ ( https://arxiv.org/abs/1610.00555 ,  386kb)
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\\
arXiv:1612.02769
replaced with revised version Mon, 28 Aug 2017 18:16:41 GMT   (18kb)

Title: Lorentz invariance violation and simultaneous emission of
  electromagnetic and gravitational waves
Authors: E. Passos, M.A. Anacleto, F.A. Brito, O. Holanda, G.B. Souza, C.A.D.
  Zarro
Categories: hep-th gr-qc hep-ph
Comments: Latex, 10 pages, no figures. Version published in PLB
Journal-ref: Phys.Lett. B772 (2017) 870-876
DOI: 10.1016/j.physletb.2017.07.064
\\ ( https://arxiv.org/abs/1612.02769 ,  18kb)
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\\
arXiv:1701.01032 (*cross-listing*)
replaced with revised version Tue, 29 Aug 2017 04:43:05 GMT   (23kb)

Title: Gravity stabilizes itself
Authors: Sumanta Chakraborty and Soumitra SenGupta
Categories: gr-qc hep-th
Comments: Revised Version, 19 pages, no figures
Journal-ref: Eur. Phys. J. C 77, 573 (2017)
DOI: 10.1140/epjc/s10052-017-5138-5
\\ ( https://arxiv.org/abs/1701.01032 ,  23kb)
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\\
arXiv:1702.08843 (*cross-listing*)
replaced with revised version Tue, 29 Aug 2017 13:02:58 GMT   (1605kb,D)

Title: Photon-Axion Conversion, Magnetic Field Configuration, and Polarization
  of Photons
Authors: Emi Masaki, Arata Aoki, and Jiro Soda
Categories: astro-ph.CO gr-qc hep-ph hep-th
Comments: 27 pages, 8 figures, published version
Report-no: KOBE-COSMO-17-02
Journal-ref: Phys. Rev. D 96, 043519 (2017)
DOI: 10.1103/PhysRevD.96.043519
\\ ( https://arxiv.org/abs/1702.08843 ,  1605kb)
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arXiv:1703.00018
replaced with revised version Tue, 29 Aug 2017 16:38:06 GMT   (18kb,D)

Title: Bulk Connectedness and Boundary Entanglement
Authors: Ning Bao, Grant N. Remmen
Categories: hep-th gr-qc quant-ph
Comments: 12 pages, 2 figures
Report-no: CALT-TH-2017-011
\\ ( https://arxiv.org/abs/1703.00018 ,  18kb)
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arXiv:1703.00456
replaced with revised version Tue, 29 Aug 2017 17:13:37 GMT   (199kb)

Title: Anti-de Sitter Space from Optimization of Path Integrals in Conformal
  Field Theories
Authors: Pawel Caputa, Nilay Kundu, Masamichi Miyaji, Tadashi Takayanagi and
  Kento Watanabe
Categories: hep-th cond-mat.stat-mech quant-ph
Comments: 7 pages, Revtex, 2 figures, Version 2 : The version published in PRL,
  title expanded and typos corrected
Report-no: YITP-17-20, IPMU17-0039
Journal-ref: Phys.Rev.Lett. 119 (2017) no.7, 071602
DOI: 10.1103/PhysRevLett.119.071602
\\ ( https://arxiv.org/abs/1703.00456 ,  199kb)
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arXiv:1704.00610
replaced with revised version Tue, 29 Aug 2017 11:09:47 GMT   (341kb)

Title: Hamiltonian Structure of Three Dimension Gravity in Vielbein Formalism
Authors: Mahdi Hajihashemi, Ahmad Shirzad
Categories: hep-th
Comments: 30 pages
\\ ( https://arxiv.org/abs/1704.00610 ,  341kb)
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\\
arXiv:1705.00751 (*cross-listing*)
replaced with revised version Tue, 29 Aug 2017 17:02:02 GMT   (17kb)

Title: Asymptotic freedom in certain $SO(N)$ and $SU(N)$ models
Authors: Martin B Einhorn and D R Timothy Jones
Categories: hep-ph hep-th
Comments: 8 pages, no figures,. In v5, added second appendix dealing with
  possible CBZ infrared fixed point. Minor changes in text. No changes in
  results. To appear in Phys. Rev. D
Report-no: LTH 1132, MCTP-17-05, NSF-KITP-17-071
\\ ( https://arxiv.org/abs/1705.00751 ,  17kb)
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arXiv:1705.01267
replaced with revised version Tue, 29 Aug 2017 13:25:28 GMT   (21kb)

Title: Nonlinear Chiral Plasma Transport in Rotating Coordinates
Authors: Omer F. Dayi and Eda Kilincarslan
Categories: hep-th cond-mat.mes-hall
Comments: 26 pages. Clarifications and references added
Journal-ref: Phys. Rev. D 96, 043514 (2017)
DOI: 10.1103/PhysRevD.96.043514
\\ ( https://arxiv.org/abs/1705.01267 ,  21kb)
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arXiv:1706.00198
replaced with revised version Tue, 29 Aug 2017 07:42:51 GMT   (16kb)

Title: The generating functional of correlation functions as a high momentum
  limit of a Wilson action
Authors: H. Sonoda
Categories: hep-th
Comments: 21 pages, no figure, LaTeX2e, major rewriting for improved
  readability
Report-no: KOBE-TH-17-02
\\ ( https://arxiv.org/abs/1706.00198 ,  16kb)
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arXiv:1706.01486
replaced with revised version Mon, 28 Aug 2017 23:05:38 GMT   (231kb,A)

Title: Curvature-Squared Multiplets, Evanescent Effects and the U(1) Anomaly in
  N = 4 Supergravity
Authors: Zvi Bern, Alex Edison, David Kosower and Julio Parra-Martinez
Categories: hep-th
Comments: 32 pages, 4 figures, RevTeX
\\ ( https://arxiv.org/abs/1706.01486 ,  231kb)
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arXiv:1706.01524 (*cross-listing*)
replaced with revised version Tue, 29 Aug 2017 08:22:15 GMT   (40kb)

Title: Renormalization theory for the Fulde-Ferrell-Larkin-Ovchinnikov states
  at $T>0$
Authors: Pawel Jakubczyk
Categories: cond-mat.quant-gas cond-mat.str-el cond-mat.supr-con hep-th
Journal-ref: Phys. Rev. A 95, 063626 (2017)
\\ ( https://arxiv.org/abs/1706.01524 ,  40kb)
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arXiv:1706.09381
replaced with revised version Tue, 29 Aug 2017 14:48:45 GMT   (342kb,AD)

Title: Two-loop supersymmetric QCD and half-maximal supergravity amplitudes
Authors: Henrik Johansson, Gregor K\"alin and Gustav Mogull
Categories: hep-th
Comments: 53 pages, 5 figures, 1 table + appendices, ancillary files; v2
  published version
Report-no: UUITP-19/17 , NORDITA 2017-062, Edinburgh 2017/12
\\ ( https://arxiv.org/abs/1706.09381 ,  342kb)
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arXiv:1707.02420
replaced with revised version Tue, 29 Aug 2017 12:11:11 GMT   (30kb)

Title: Superconformal Chern-Simons Theories from del Pezzo Geometries
Authors: Sanefumi Moriyama, Tomoki Nosaka, Katsuya Yano
Categories: hep-th
Comments: 45 pages; v2: minor changes
Report-no: OCU-PHYS 467, KIAS-P17046
\\ ( https://arxiv.org/abs/1707.02420 ,  30kb)
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arXiv:1708.06811
replaced with revised version Tue, 29 Aug 2017 06:13:50 GMT   (100kb,D)

Title: Quantum computational complexity, Einstein's equations and accelerated
  expansion of the Universe
Authors: Xian-Hui Ge, Bin Wang
Categories: hep-th gr-qc quant-ph
Comments: 1+20 pages, 2 figures, references added
\\ ( https://arxiv.org/abs/1708.06811 ,  100kb)
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