pinecone/core-2020-05-10-deduplication huggingface dataset:
Scattering of spherically symmetric d-dimensional α′−corrected black holes in string theory

We study scattering of minimally coupled massless scalar fields by non-extremal
spherically symmetric black holes in d dimensions with string-theoretical α′ corrections. We
then obtain a formula for the low frequency absorption cross section for every black hole
of this kind, which we apply to known black hole solutions. We compare the α′ corrections
for the absorption cross section with those for the black hole entropy, obtained through
Wald’s formula, in each case concluding that these corrections are different. We find a general
covariant formula for the absorption cross section including α′ corrections, in terms of
the horizon area and temperatureThe author wishes to acknowledge useful discussions with Dan Gorbonos, Miguel Paulos, Sameer Murthy and Ricardo Schiappa. This work has been supported by FEDER funds through Programa Operacional Fatores de Competitividade - COMPETE and by Fundacao para a Ciencia e a Tecnologia through projects Est-C/MAT/UI0013/2011, CERN/FP/116377/2010 and CERN/FP/123609/2011
On the moduli space of spontaneously broken N = 8 supergravity

We analyze the moduli space of spontaneously broken N=8 supergravity theories
in 4 dimensions with classical Minkowski vacua. We find that all the known
classical vacua, as well as the several new ones we construct here, can be
connected by sending some of the moduli to their boundary values. We also show
that Cremmer-Scherk-Schwarz models can be viewed as special limits of more
general CSO* gaugings, which allow for non-Abelian residual symmetries on the
vacuum. Finally, we find that all the classical Minkowski vacua with fully
broken supersymmetry found so far are unstable with respect to 1-loop
corrections, which drive the effective potential to negative values.Comment: 37 pages; v2: one reference and two comments added, version accepted
  for publication on JHEP; v3: small problem with boldface fonts fixe
Prospects for measuring the mass of heavy, long-lived neutral particles
  that decay to photons

We describe a novel way to measure the mass of heavy, long-lived neutral
particles that decay to photons using collider experiments. We focus on a Light
Neutralino and Gravitino model in a Gauge Mediated Supersymmetry Breaking
scenario where the neutralino has a long-lifetime (O(ns)) as it is not excluded
by current experiments. To illustrate our method and give sensitivity estimates
we use recent CDF results and a production mechanism where sparticles are
produced via $\phi_{i} \rightarrow \widetilde{\chi}^{1}_{0}
\widetilde{\chi}^{1}_{0} \rightarrow (\gamma \widetilde{G})(\gamma
\widetilde{G})$ in which $\phi_{i}$ indicates a neutral scalar boson,
$\widetilde{\chi}^{1}_{0}$ is the lightest neutralino and $\widetilde{G}$ is
the gravitino, as a full set of background shapes and rates are available.
Events can be observed in the exclusive photon plus Missing $E_{T}$ final state
where one photon arrives at the detector with a delayed time of arrival.
Surprisingly, a simple measurement of the slope of the delayed-time
distribution with the full CDF dataset is largely insensitive to all but the
$\widetilde{\chi}^{1}_{0}$ mass and allows for the possibility of determining
its mass to approximately 25% of itself.Comment: 16 pages, 6 figure
Self-dual supersymmetric nonlinear sigma models

In four-dimensional N=1 Minkowski superspace, general nonlinear sigma models
with four-dimensional target spaces may be realised in term of CCL (chiral and
complex linear) dynamical variables which consist of a chiral scalar, a complex
linear scalar and their conjugate superfields. Here we introduce CCL sigma
models that are invariant under U(1) "duality rotations" exchanging the
dynamical variables and their equations of motion. The Lagrangians of such
sigma models prove to obey a partial differential equation that is analogous to
the self-duality equation obeyed by U(1) duality invariant models for nonlinear
electrodynamics. These sigma models are self-dual under a Legendre
transformation that simultaneously dualises (i) the chiral multiplet into a
complex linear one; and (ii) the complex linear multiplet into a chiral one.
Any CCL sigma model possesses a dual formulation given in terms of two chiral
multiplets. The U(1) duality invariance of the CCL sigma model proves to be
equivalent, in the dual chiral formulation, to a manifest U(1) invariance
rotating the two chiral scalars. Since the target space has a holomorphic
Killing vector, the sigma model possesses a third formulation realised in terms
of a chiral multiplet and a tensor multiplet.
  The family of U(1) duality invariant CCL sigma models includes a subset of
N=2 supersymmetric theories. Their target spaces are hyper Kahler manifolds
with a non-zero Killing vector field. In the case that the Killing vector field
is triholomorphic, the sigma model admits a dual formulation in terms of a
self-interacting off-shell N=2 tensor multiplet.
  We also identify a subset of CCL sigma models which are in a one-to-one
correspondence with the U(1) duality invariant models for nonlinear
electrodynamics. The target space isometry group for these sigma models
contains a subgroup U(1) x U(1).Comment: 22 page
The Z+photon and diphoton decays of the Higgs boson as a joint probe of
  low energy SUSY models at LHC

In light of recent remarkable progress in Higgs search at the LHC, we study
the rare decay process $h \to Z\gamma$ and show its correlation with the decay
$h \to \gamma\gamma$ in low energy SUSY models such as CMSSM, MSSM, NMSSM and
nMSSM. Under various experimental constraints, we scan the parameter space of
each model, and present in the allowed parameter space the SUSY predictions on
the $Z\gamma$ and $\gamma\gamma$ signal rates in the Higgs production at the
LHC and future e+e- linear colliders. We have following observations: (i)
Compared with the SM prediction, the $Z\gamma$ and $\gamma\gamma$ signal rates
in the CMSSM are both slightly suppressed; (ii) In the MSSM, both the $Z\gamma$
and $\gamma\gamma$ rates can be either enhanced or suppressed, and in optimal
case, the enhancement factors can reach 1.2 and 2 respectively; (iii) In the
NMSSM, the $Z\gamma$ and $\gamma\gamma$ signal rates normalized by their SM
predictions are strongly correlated, and vary from 0.2 to 2; (iv) In the nMSSM,
the $Z\gamma$ and $\gamma\gamma$ rates are greatly reduced. Since the
correlation behavior between the Z\gamma signal and the \gamma\gamma signal is
so model-dependent, it may be used to distinguish the models in future
experiments.Comment: 28 pages, 6 figure
Gauge theory of Lorentz group as a source of the dynamical electroweak
  symmetry breaking

We consider the gauge theory of Lorentz group coupled in a nonminimal way to
fermions. We suggest the hypothesis that the given theory may exist in the
phase with broken chiral symmetry and without confinement. The lattice
discretization of the model is described. This unusual strongly coupled theory
may appear to be the source of the dynamical electroweak symmetry breaking.
Namely, in this theory all existing fermions interact with the SO(3,1) gauge
field. In the absence of the other interactions the chiral condensate may
appear and all fermionic excitations may acquire equal masses. Small
corrections to the gap equations due to the other interactions may cause the
appearance of the observed hierarchy of masses.Comment: accepted for publication in JHE
Natural Tuning: Towards A Proof of Concept

The cosmological constant problem and the absence of new natural physics at
the electroweak scale, if confirmed by the LHC, may either indicate that the
nature is fine-tuned or that a refined notion of naturalness is required. We
construct a family of toy UV complete quantum theories providing a proof of
concept for the second possibility. Low energy physics is described by a tuned
effective field theory, which exhibits relevant interactions not protected by
any symmetries and separated by an arbitrary large mass gap from the new
"gravitational" physics, represented by a set of irrelevant operators.
Nevertheless, the only available language to describe dynamics at all energy
scales does not require any fine-tuning. The interesting novel feature of this
construction is that UV physics is not described by a fixed point, but rather
exhibits asymptotic fragility. Observation of additional unprotected scalars at
the LHC would be a smoking gun for this scenario. Natural tuning also favors
TeV scale unification.Comment: 25 pages, 6 figure
Holographic superconductors with hyperscaling violation

We investigate holographic superconductors in asympototically geometries with
hyperscaling violation. The mass of the scalar field decouples from the UV
dimension of the dual scalar operator and can be chosen as negative as we want,
without disturbing the Breitenlohner-Freedman bound. We first numerically find
that the scalar condenses below a critical temperature and a gap opens in the
real part of the conductivity, indicating the onset of superconductivity. We
further analytically explore the effects of the hyperscaling violation on the
superconducting transition temperature. We find that the critical temperature
increases with the increasing of hyperscaling violation.Comment: 12pages and 3 figure
Semiclassical energy conditions for quantum vacuum states

We present and develop several nonlinear energy conditions suitable for use
in the semiclassical regime. In particular, we consider the recently formulated
"flux energy condition" (FEC), and the novel "trace-of-square" (TOSEC) and
"determinant" (DETEC) energy conditions. As we shall show, these nonlinear
energy conditions behave much better than the classical linear energy
conditions in the presence of semiclassical quantum effects. Moreover, whereas
the quantum extensions of these nonlinear energy conditions seem to be quite
widely satisfied as one enters the quantum realm, analogous quantum extensions
are generally not useful for the linear classical energy conditions.Comment: V1: 42 pages, 6 figures. V2: 43 pages, 6 figures. Title changed, some
  discussion added, 3 references added, some typos fixed. V3: Minor edits.
  Published versio
Scattering by a long-range potential

The phenomenon of wave tails has attracted much attention over the years from
both physicists and mathematicians. However, our understanding of this
fascinating phenomenon is not complete yet. In particular, most former studies
of the tail phenomenon have focused on scattering potentials which approach
zero asymptotically ($x\to\infty$) faster than $x^{-2}$. It is well-known that
for these (rapidly decaying) scattering potentials the late-time tails are
determined by the first Born approximation and are therefore {\it linear} in
the amplitudes of the scattering potentials (there are, however, some
exceptional cases in which the first Born approximation vanishes and one has to
consider higher orders of the scattering problem). In the present study we
analyze in detail the late-time dynamics of the Klein-Gordon wave equation with
a ({\it slowly} decaying) Coulomb-like scattering potential:
$V(x\to\infty)=\alpha/x$. In particular, we write down an explicit solution
(that is, an exact analytic solution which is not based on the first Born
approximation) for this scattering problem. It is found that the asymptotic
($t\to\infty$) late-time behavior of the fields depends {\it non}-linearly on
the amplitude $\alpha$ of the scattering potential. This non-linear dependence
on the amplitude of the scattering potential reflects the fact that the
late-time dynamics associated with this slowly decaying scattering potential is
dominated by {\it multiple} scattering from asymptotically far regions.Comment: 5 page
Linear growth of entanglement entropy in holographic thermalization
  captured by horizon interiors and mutual information

We study the holographic entanglement entropy in a homogeneous falling shell
background, which is dual to the strongly coupled field theory following a
global quench. For d=2 conformal field theories, it is known that the entropy
has a linear growth regime if the scale of the entangling region is large. In
addition, the growth rate approaches a constant when the scale increases. We
demonstrate analytically that this behavior is directly related to the part of
minimal area surface probing the interior of apparent horizons in the bulk, as
well as the mutual information between two disjoint rectangular subsystems in
the boundary. Furthermore, we show numerically that all the results are
universal for the d=3 conformal field theory, the non-relativistic
scale-invariant theory and the dual theory of Gauss-Bonnet gravity.Comment: 35 pages, 19 figures, minor changes, version matching that published
  on JHE
Leptons in Composite MFV

We study the lepton sector of composite Higgs models with partial
compositeness. The standard anarchic scenario is in conflict with the absence
of observable charged lepton flavor violation. This tension can be completely
solved in MFV scenarios that require either left-handed or right-handed SM
leptons to be equally composite. Constraints on this scenario are weak and the
composite lepton partners could be as light as few hundreds GeVs with
interesting LHC signatures. The contribution to the muon (g-2) in theories
where the Higgs is a pseudo Nambu-Goldstone boson is also discussed.Comment: 16 pages; v2 Refs. added, version published on JHEP; v3 appendix on
  muon g-2 superseded by 1407.247
Here be Dragons: The Unexplored Continents of the CMSSM

The Higgs boson mass and the abundance of dark matter constrain the
CMSSM/mSUGRA supersymmetry breaking inputs. A complete map of the CMSSM that is
consistent with these two measured quantities is provided. Various
"continents," consisting of non-excluded models, can be organized by their dark
matter dynamics. The following mechanisms manifest: well-tempering, resonant
pseudo-scalar Higgs annihilation, neutralino/stau coannihilations and
neutralino/stop coannihilations. Benchmark models are chosen in order to
characterize the viable regions. The expected visible signals of each are
described, demonstrating a wide range of predictions for the 13 TeV LHC and a
high degree of complementarity between dark matter and collider experiments.
The parameter space spans a finite volume, which can be probed in its entirety
with experiments currently under consideration.Comment: 58 pages + references, 21 figures, data files included on arXiv; v2:
  references added, minor changes; v3: journal version, minor change
Classical 3-loop 2-body diagrams

As part of the study of the two-body problem in Einstein's gravity, the
fourth post-Newtonian order (4PN) of the two-body effective action is being
computed presently by both effective field theory (EFT) methods and others.
Diagrams with 3 (or 4) classical loops appear to be a significant obstacle. In
this paper we develop a method to compute such 3-loop diagrams and demonstrate
it through a specific diagram. We reduce the classical diagrams through
shrinking the body worldlines to a form more familiar in Quantum Field Theory.
A key ingredient in the evaluation is the Integration By Parts method for
Feynman integrals.Comment: 15 pages, 6 figures. v2: updated references and credit. v3: added
  calculation and a minor correctio
Surface Defects and Resolvents

We study a large class of BPS surface defects in 4d N=2 gauge theories. They
are defined by coupling a 2d N=(2,2) gauged linear sigma model to the 4d bulk
degrees of freedom. Our main result is an efficient computation of the
effective twisted superpotential for all these models in terms of a basic
object closely related to the resolvent of the 4d gauge theory, which encodes
the curve describing the 4d low energy dynamics. We reproduce and extend the
results of brane constructions and compute the effective twisted superpotential
for general monodromy surface defects. We encounter novel, puzzling field
theory phenomena in the low energy dynamics of the simplest surface defects and
we propose some local models to explain them. We also study in some detail the
behavior of surface defects near monopole points of the bulk theory's Coulomb
branch. Finally, we explore the effect on the defect of breaking the bulk
supersymmetry from N=2 to N=1 and show that certain quantities are independent
of this breaking.Comment: 59 pages, 8 figures, references adde
Conformal supergravity in three dimensions: New off-shell formulation

We propose a new off-shell formulation for N-extended conformal supergravity
in three spacetime dimensions. Our construction is based on the gauging of the
N-extended superconformal algebra in superspace. Covariant constraints are
imposed such that the algebra of covariant derivatives is given in terms of a
single curvature superfield which turns out to be the super Cotton tensor. An
immediate corollary of this construction is that the curved superspace is
conformally flat if and only if the super Cotton tensor vanishes. Upon
degauging of certain local symmetries, our formulation is shown to reduce to
the conventional one with the local structure group SL(2,R) x SO(N).Comment: 46 pages; v3: published versio
How fluids bend: the elastic expansion for higher-dimensional black holes

Hydrodynamics can be consistently formulated on surfaces of arbitrary co-dimension in a background space-time, providing the effective theory describing long-wavelength perturbations of black branes. When the co-dimension is non-zero, the system acquires fluid-elastic properties and constitutes what is called a fluid brane. Applying an effective action approach, the most general form of the free energy quadratic in the extrinsic curvature and extrinsic twist potential of stationary fluid brane configurations is constructed to second order in a derivative expansion. This construction generalizes the Helfrich-Canham bending energy for fluid membranes studied in theoretical biology to the case in which the fluid is rotating. It is found that stationary fluid brane configurations are characterized by a set of 3 elastic response coefficients, 3 hydrodynamic response coefficients and 1 spin response coefficient for co-dimension greater than one. Moreover, the elastic degrees of freedom present in the system are coupled to the hydrodynamic degrees of freedom. For co-dimension-1 surfaces we find a 8 independent parameter family of stationary fluid branes. It is further shown that elastic and spin corrections to (non)-extremal brane effective actions can be accounted for by a multipole expansion of the stress-energy tensor, therefore establishing a relation between the different formalisms of Carter, Capovilla-Guven and Vasilic-Vojinovic and between gravity and the effective description of stationary fluid branes. Finally, it is shown that the Young modulus found in the literature for black branes falls into the class predicted by this approach - a relation which is then used to make a proposal for the second order effective action of stationary blackfolds and to find the corrected horizon angular velocity of thin black rings
Competition and Coexistence of Order Parameters in Holographic
  Multi-Band Superconductors

We construct a holographic multi-band superconductor model with each complex
scalar field in the bulk minimally coupled to a same gauge field. Taking into
account the back reaction of matter fields on the background geometry and
focusing on the two band case with two scalar order parameters, we find that
depending on the strength of the back reaction and the charge ratio of the two
bulk scalars, five different superconducting phases exist, and three of five
phases exhibit some region where both orders coexist and are thermodynamically
favored. The other two superconducting phases have only one scalar order. The
model exhibits rich phase structure and we construct the full diagram for the
five superconducting phases. Our analysis indicates that the equivalent
attractive interaction mediated by gravity between the two order parameters
tends to make the coexistence of two orders much more easy rather than more
difficult.Comment: v2: references adde
U-duality covariant gravity

We extend the techniques of double field theory to more general gravity
theories and U-duality symmetries, having in mind applications to the complete
D=11 supergravity. In this paper we work out a (3+3)-dimensional `U-duality
covariantization' of D=4 Einstein gravity, in which the Ehlers group SL(2,R) is
realized geometrically, acting in the 3 representation on half of the
coordinates. We include the full (2+1)-dimensional metric, while the `internal
vielbein' is a coset representative of SL(2,R)/SO(2) and transforms under gauge
transformations via generalized Lie derivatives. In addition, we introduce a
gauge connection of the `C-bracket', and a gauge connection of SL(2,R), albeit
subject to constraints. The action takes the form of (2+1)-dimensional gravity
coupled to a Chern-Simons-matter theory but encodes the complete D=4 Einstein
gravity. We comment on generalizations, such as an `$E_{8(8)}$
covariantization' of M-theory.Comment: 36 pages, v2: refs. added, to appear in JHE
Multi-loop open string amplitudes and their field theory limit

We study the field theory limit of multi-loop (super)string amplitudes, with
the aim of clarifying their relationship to Feynman diagrams describing the
dynamics of the massless states. We propose an explicit map between string
moduli around degeneration points and Schwinger proper-times characterizing
individual Feynman diagram topologies. This makes it possible to identify the
contribution of each light string state within the full string amplitude and to
extract the field theory Feynman rules selected by (covariantly quantized)
string theory. The connection between string and field theory amplitudes also
provides a concrete tool to clarify ambiguities related to total derivatives
over moduli space: in the superstring case, consistency with the field theory
results selects a specific prescription for integrating over supermoduli. In
this paper, as an example, we focus on open strings supported by parallel
D-branes, and we present two-loop examples drawn from bosonic and RNS string
theories, highlighting the common features between the two setups.Comment: 23 pages, one figure; Changes in v3: Notation for \sqrt{k} changed in
  equations (2.6), (3.11), (3.13), (5.10) with explanation added after (3.11)
  and (5.9). Equation (5.13) and (5.14) altered (overall results unchanged).
  Sign convention for \sqrt{p_i} added on p.13. Discussion slightly modified
  after (3.12), (5.3), (5.15
Vector meson production at low x from gauge/gravity duality

We use gauge/gravity duality to study vector meson (J/{\Psi}, {\rho}_0,
{\Omega}, {\Phi}) production in electron-proton scattering, in the limit of
high center of mass energy at fixed momentum transfer, corresponding to the
limit of low Bjorken x, where the process is dominated by pomeron exchange. Our
approach considers the pomeron at strong coupling, described by the graviton
Regge trajectory in AdS space with a hard-wall to mimic confinement effects.
Both the proton and vector mesons are described by simple holographic wave
functions in AdS. This model agrees with HERA H1 data with a {\chi}^2 per
degree of freedom below one on total cross-sections, and below two on
differential cross-sections, confirming the success of previous studies that
model low x DIS and DVCS using gauge/gravity duality.Comment: 20 pages, 6 figures; reference adde