pinecone/core-2020-05-10-deduplication huggingface dataset:
BMS/GCA Redux: Towards Flatspace Holography from Non-Relativistic
  Symmetries

The asymptotic group of symmetries at null infinity of flat spacetimes in
three and four dimensions is the infinite dimensional Bondi-Metzner-Sachs (BMS)
group. This has recently been shown to be isomorphic to non-relativistic
conformal algebras in one lower dimension, the Galilean Conformal Algebra (GCA)
in 2d and a closely related non-relativistic algebra in 3d [1]. We provide a
better understanding of this surprising connection by providing a spacetime
interpretation in terms of a novel contraction. The 2d GCA, obtained from a
linear combination of two copies of the Virasoro algebra, is generically
non-unitary. The unitary subsector previously constructed had trivial
correlation functions. We consider a representation obtained from a different
linear combination of the Virasoros, which is relevant to the relation with the
BMS algebra in three dimensions. This is realised by a new space-time
contraction of the parent algebra. We show that this representation has a
unitary sub-sector with interesting correlation functions. We discuss
implications for the BMS/GCA correspondence and show that the flat space limit
actually induces precisely this contraction on the boundary conformal field
theory. We also discuss aspects of asymptotic symmetries and the consequences
of this contraction in higher dimensions.Comment: 26 pages, 1 figure, 1 table; v2: Minor correction
BPS States, Refined Indices, and Quiver Invariants

For D=4 BPS state construction, counting, and wall-crossing thereof, quiver
quantum mechanics offers two alternative approaches, the Coulomb phase and the
Higgs phase, which sometimes produce inequivalent counting. The authors have
proposed, in arXiv:1205.6511, two conjectures on the precise relationship
between the two, with some supporting evidences. Higgs phase ground states are
naturally divided into the Intrinsic Higgs sector, which is insensitive to
wall-crossings and thus an invariant of quiver, plus a pulled-back ambient
cohomology, conjectured to be an one-to-one image of Coulomb phase ground
states. In this note, we show that these conjectures hold for all cyclic
quivers with Abelian nodes, and further explore angular momentum and R-charge
content of individual states. Along the way, we clarify how the protected spin
character of BPS states should be computed in the Higgs phase, and further
determine the entire Hodge structure of the Higgs phase cohomology. This shows
that, while the Coulomb phase states are classified by angular momentum, the
Intrinsic Higgs states are classified by R-symmetry.Comment: 51 pages, 5 figure
Entropy of three-dimensional asymptotically flat cosmological solutions

The thermodynamics of three-dimensional asymptotically flat cosmological
solutions that play the same role than the BTZ black holes in the anti-de
Sitter case is derived and explained from holographic properties of flat space.
It is shown to coincide with the flat-space limit of the thermodynamics of the
inner black hole horizon on the one hand and the semi-classical approximation
to the gravitational partition function associated to the entropy of the outer
horizon on the other. This leads to the insight that it is the Massieu function
that is universal in the sense that it can be computed at either horizon.Comment: 16 pages Latex file, v2: references added, cosmetic changes, v3: 1
  reference adde
On Holographic Entanglement Entropy of Charged Matter

We study holographic entanglement entropy in the background of charged
dilatonic black holes which can be viewed as holographic duals of certain
finite density states of N=4 super Yang-Mills. These charged black holes are
distinguished in that they have vanishing ground state entropy. The
entanglement entropy for a slab experiences a second order phase transition as
the thickness of the slab is varied, while the entanglement entropy for a
sphere is a smooth function of the radius. This suggests that the second scale
introduced by the anisotropy of the slab plays an important role in driving the
phase transition. In both cases we do not observe any logarithmic violation of
the area law indicative of hidden Fermi surfaces. We investigate how these
results are affected by the inclusion of the Gauss-Bonnet term in the bulk
gravitational action. We also observe that such addition to the bulk action
does not change the logarithmic violation of the area law in the backgrounds
with hyperscaling violation.Comment: harvmac, 26 pages, 9 figures; v2: minor correction
Universal contributions to scalar masses from five dimensional
  supergravity

We compute the effective Kahler potential for matter fields in warped
compactifications, starting from five dimensional gauged supergravity, as a
function of the matter fields localization. We show that truncation to zero
modes is inconsistent and the tree-level exchange of the massive gravitational
multiplet is needed for consistency of the four-dimensional theory. In addition
to the standard Kahler coming from dimensional reduction, we find the quartic
correction coming from integrating out the gravity multiplet. We apply our
result to the computation of scalar masses, by assuming that the SUSY breaking
field is a bulk hypermultiplet. In the limit of extreme opposite localization
of the matter and the spurion fields, we find zero scalar masses, consistent
with sequestering arguments. Surprisingly enough, for all the other cases the
scalar masses are tachyonic. This suggests the holographic interpretation that
a CFT sector always generates operators contributing in a tachyonic way to
scalar masses. Viability of warped su- persymmetric compactifications
necessarily asks then for additional contributions. We discuss the case of
additional bulk vector multiplets with mixed boundary conditions, which is a
partic- ularly simple and attractive way to generate large positive scalar
masses. We show that in this case successful fermion mass matrices implies
highly degenerate scalar masses for the first two generations of squarks and
sleptons.Comment: 23 pages. v2: References added, new section on effect of additional
  bulk vector multiplets and phenomenolog
Corrections to the SU(3 x SU(3) Gell-Mann-Oakes-Renner relation and chiral couplings Lr8 and Hr2

Next to leading order corrections to the SU(3) × SU(3) Gell-Mann-Oakes-Renner relation (GMOR) are obtained using weighted QCD Finite Energy Sum Rules (FESR) involving the pseudoscalar current correlator. Two types of integration kernels in the FESR are used to suppress the contribution of the kaon radial excitations to the hadronic spectral function, one with local and the other with global constraints. The result for the pseudoscalar current correlator at zero momentum is psi 5(0) = (2.8 ± 0.3) ×10-3 GeV4, leading to the chiral corrections to GMOR: delta K = (55 ± 5)%. The resulting uncertainties are mostly due to variations in the upper limit of integration in the FESR, within the stability regions, and to a much lesser extent due to the uncertainties in the strong coupling and the strange quark mass. Higher order quark mass corrections, vacuum condensates, and the hadronic resonance sector play a negligible role in this determination. These results confirm an independent determination from chiral perturbation theory giving also very large corrections, i.e. roughly an order of magnitude larger than the corresponding corrections in chiral SU(2) × SU(2). Combining these results with our previous determination of the corrections to GMOR in chiral SU(2) × SU(2), delta pi , we are able to determine two low energy constants of chiral perturbation theory, i.e. L_8^r=( {1.0± 0.3} )× {10^{-3 }} , and H_2^r=-( {4.7± 0.6} )× {10^{-3 }} , both atthe scaleof the rho-meson mass
Structure in 6D and 4D N=1 supergravity theories from F-theory

We explore some aspects of 4D supergravity theories and F-theory vacua that
are parallel to structures in the space of 6D theories. The spectrum and
topological terms in 4D supergravity theories correspond to topological data of
F-theory geometry, just as in six dimensions. In particular, topological
axion-curvature squared couplings appear in 4D theories; these couplings are
characterized by vectors in the dual to the lattice of axion shift symmetries
associated with string charges. These terms are analogous to the Green-Schwarz
terms of 6D supergravity theories, though in 4D the terms are not generally
linked with anomalies. We outline the correspondence between F-theory topology
and data of the corresponding 4D supergravity theories. The correspondence of
geometry with structure in the low-energy action illuminates topological
aspects of heterotic-F-theory duality in 4D as well as in 6D. The existence of
an F-theory realization also places geometrical constraints on the 4D
supergravity theory in the large-volume limit.Comment: 63 page
Entanglement Entropy and Wilson Loop in St\"{u}ckelberg Holographic
  Insulator/Superconductor Model

We study the behaviors of entanglement entropy and vacuum expectation value
of Wilson loop in the St\"{u}ckelberg holographic insulator/superconductor
model. This model has rich phase structures depending on model parameters. Both
the entanglement entropy for a strip geometry and the heavy quark potential
from the Wilson loop show that there exists a "confinement/deconfinement" phase
transition. In addition, we find that the non-monotonic behavior of the
entanglement entropy with respect to chemical potential is universal in this
model. The pseudo potential from the spatial Wilson loop also has a similar
non-monotonic behavior. It turns out that the entanglement entropy and Wilson
loop are good probes to study the properties of the holographic superconductor
phase transition.Comment: 23 pages,12 figures. v2: typos corrected, accepted in JHE
Revisiting the S-matrix approach to the open superstring low energy
  effective lagrangian

The conventional S-matrix approach to the (tree level) open string low energy
effective lagrangian assumes that, in order to obtain all its bosonic
${\alpha'}^N$ order terms, it is necessary to know the open string (tree level)
$(N+2)$-point amplitude of massless bosons, at least expanded at that order in
$\alpha'$. In this work we clarify that the previous claim is indeed valid for
the bosonic open string, but for the supersymmetric one the situation is much
more better than that: there are constraints in the kinematical bosonic terms
of the amplitude (probably due to Spacetime Supersymmetry) such that a much
lower open superstring $n$-point amplitude is needed to find all the
${\alpha'}^N$ order terms. In this `revisited' S-matrix approach we have
checked that, at least up to ${\alpha'}^4$ order, using these kinematical
constraints and only the known open superstring 4-point amplitude, it is
possible to determine all the bosonic terms of the low energy effective
lagrangian. The sort of results that we obtain seem to agree completely with
the ones achieved by the method of BPS configurations, proposed about ten years
ago. By means of the KLT relations, our results can be mapped to the NS-NS
sector of the low energy effective lagrangian of the type II string theories
implying that there one can also find kinematical constraints in the $N$-point
amplitudes and that important informations can be inferred, at least up to
${\alpha'}^4$ order, by only using the (tree level) 4-point amplitude.Comment: 34 pages, 3 figure, Submitted on Aug 4, 2012, Published on Oct 15,
  201
NLO QCD corrections to off-shell top-antitop production with leptonic decays at hadron colliders

We present details of a calculation of the cross section for hadronic top-antitop production in next-to-leading order (NLO) QCD, including the decays of the top and antitop into bottom quarks and leptons. This calculation is based on matrix elements for ν e e+ μ - {{overline{ν}}_{μ }}boverline{b} production and includes all non-resonant diagrams, interferences, and off-shell effects of the top quarks. Such contributions are formally suppressed by the top-quark width and turn out to be small in the inclusive cross section. However, they can be strongly enhanced in exclusive observables that play an important role in Higgs and new-physics searches. Also non-resonant and off-shell effects due to the finite W-boson width are investigated in detail, but their impact is much smaller than naively expected. We also introduce a matching approach to improve NLO calculations involving intermediate unstable particles. Using a fixed QCD scale leads to perturbative instabilities in the high-energy tails of distributions, but an appropriate dynamical scale stabilises NLO predictions. Numerical results for the total cross section, several distributions, and asymmetries are presented for Tevatron and the LHC at 7 TeV, 8 TeV, and 14 TeV
BPS States in Omega Background and Integrability

We reconsider string and domain wall central charges in N=2 supersymmetric
gauge theories in four dimensions in presence of the Omega background in the
Nekrasov-Shatashvili (NS) limit. Existence of these charges entails presence of
the corresponding topological defects in the theory - vortices and domain
walls. In spirit of the 4d/2d duality we discuss the worldsheet low energy
effective theory living on the BPS vortex in N=2 Supersymmetric Quantum
Chromodynamics (SQCD). We discuss some aspects of the brane realization of the
dualities between various quantum integrable models. A chain of such dualities
enables us to check the AGT correspondence in the NS limit.Comment: 48 pages, 10 figures, minor changes, references added, typos
  correcte
Higgs Boson Masses in the Complex NMSSM at One-Loop Level

The Next-to-Minimal Supersymmetric Extension of the Standard Model (NMSSM)
with a Higgs sector containing five neutral and two charged Higgs bosons allows
for a rich phenomenology. In addition, the plethora of parameters provides many
sources of CP violation. In contrast to the Minimal Supersymmetric Extension,
CP violation in the Higgs sector is already possible at tree-level. For a
reliable understanding and interpretation of the experimental results of the
Higgs boson search, and for a proper distinction of Higgs sectors provided by
the Standard Model or possible extensions, the Higgs boson masses have to be
known as precisely as possible including higher-order corrections. In this
paper we calculate the one-loop corrections to the neutral Higgs boson masses
in the complex NMSSM in a Feynman diagrammatic approach adopting a mixed
renormalization scheme based on on-shell and $\bar{DR}$ conditions. We study
various scenarios where we allow for tree-level CP-violating phases in the
Higgs sector and where we also study radiatively induced CP violation due to a
non-vanishing phase of the trilinear coupling $A_t$ in the stop sector. The
effects on the Higgs boson phenomenology are found to be significant. We
furthermore estimate the theoretical error due to unknown higher-order
corrections by both varying the renormalization scheme of the top and bottom
quark masses and by adopting different renormalization scales. The residual
theoretical error can be estimated to about 10%
Metastable de Sitter vacua in N=2 to N=1 truncated supergravity

We study the possibility of achieving metastable de Sitter vacua in general
N=2 to N=1 truncated supergravities without vector multiplets, and compare with
the situations arising in N=2 theories with only hypermultiplets and N=1
theories with only chiral multiplets. In N=2 theories based on a quaternionic
manifold and a graviphoton gauging, de Sitter vacua are necessarily unstable,
as a result of the peculiar properties of the geometry. In N=1 theories based
on a Kahler manifold and a superpotential, de Sitter vacua can instead be
metastable provided the geometry satisfies some constraint and the
superpotential can be freely adjusted. In N=2 to N=1 truncations, the crucial
requirement is then that the tachyon of the mother theory be projected out from
the daughter theory, so that the original unstable vacuum is projected to a
metastable vacuum. We study the circumstances under which this may happen and
derive general constraints for metastability on the geometry and the gauging.
We then study in full detail the simplest case of quaternionic manifolds of
dimension four with at least one isometry, for which there exists a general
parametrization, and study two types of truncations defining Kahler
submanifolds of dimension two. As an application, we finally discuss the case
of the universal hypermultiplet of N=2 superstrings and its truncations to the
dilaton chiral multiplet of N=1 superstrings. We argue that de Sitter vacua in
such theories are necessarily unstable in weakly coupled situations, while they
can in principle be metastable in strongly coupled regimes.Comment: 40 pages, no figure
On jet mass distributions in Z+jet and dijet processes at the LHC

The mass distribution of jets produced in hard processes at the LHC plays an
important role in several jet substructure related studies involving both
Standard Model and BSM physics, especially in the context of boosted heavy
particle searches. We compute analytically the jet-mass distribution for both
Z+jet and dijet processes, for QCD jets defined in the anti-k_t algorithm with
an arbitrary radius R, to next-to-leading logarithmic accuracy and match our
resummed calculation to full leading-order results. We note the important role
played by initial state radiation (ISR) and non-global logarithms explicitly
computed here for the first time for hadron collider observables, as well as
the jet radius dependence of these effects. We also compare our results to
standard Monte Carlo event generators and discuss directions for further
studies and phenomenology.Comment: 39 pages, 7 figures. We rectify our statement about finite R
  corrections to non-global logarithms in Eq. 4.5 and Appendix B.1. The
  corrections we find have negligible impact on the numeric
F-Theory and the Mordell-Weil Group of Elliptically-Fibered Calabi-Yau
  Threefolds

The Mordell-Weil group of an elliptically fibered Calabi-Yau threefold X
contains information about the abelian sector of the six-dimensional theory
obtained by compactifying F-theory on X. After examining features of the
abelian anomaly coefficient matrix and U(1) charge quantization conditions of
general F-theory vacua, we study Calabi-Yau threefolds with Mordell-Weil
rank-one as a first step towards understanding the features of the Mordell-Weil
group of threefolds in more detail. In particular, we generate an interesting
class of F-theory models with U(1) gauge symmetry that have matter with both
charges 1 and 2. The anomaly equations --- which relate the Neron-Tate height
of a section to intersection numbers between the section and fibral rational
curves of the manifold --- serve as an important tool in our analysis.Comment: 29 pages + appendices, 5 figures; v2: minor correction
Slepton pair production in the POWHEG BOX

We present an implementation for slepton pair production at hadron colliders
in the POWHEG BOX, a framework for combining next-to-leading order QCD
calculations with parton-shower Monte-Carlo programs. Our code provides a SUSY
Les Houches Accord interface for setting the supersymmetric input parameters.
Decays of the sleptons and parton-shower effects are simulated with PYTHIA.
Focussing on a representative point in the supersymmetric parameter space we
show results for kinematic distributions that can be observed experimentally.
While next-to-leading order QCD corrections are sizable for all distributions,
the parton shower affects the color-neutral particles only marginally.
Pronounced parton-shower effects are found for jet distributions.Comment: 10 pages, 4 figure
Illuminating the 130 GeV Gamma Line with Continuum Photons

There is evidence for a 130 GeV gamma-ray line at the Galactic Center in the
Fermi Large Area Telescope data. Dark matter candidates that explain this
feature should also annihilate to Standard Model particles, resulting in a
continuous spectrum of photons. To study this continuum, we analyze the Fermi
data down to 5 GeV, restricted to the inner 3 degrees of the Galaxy. We place a
strong bound on the ratio of continuum photons to monochromatic line photons
that is independent of uncertainties in the dark matter density profile. The
derived constraints exclude neutralino dark matter as an explanation for the
line.Comment: 14+10 pages, 11 figures, 3 appendices; v2 refs added, additional
  final states included; v3 minor difference in data selection criteria,
  conclusions unchanged; v4 journal versio
Conformally compactified Minkowski superspaces revisited

Starting from the standard supertwistor realizations for conformally
compactified N-extended Minkowski superspaces in three and four space-time
dimensions, we elaborate on alternative realizations in terms of graded
two-forms on the dual supertwistor spaces. The construction is further
generalized to the cases of 4D N=2 and 3D N-extended harmonic/projective
superspaces. We present a superconformal Fourier expansion of tensor
superfields on the 4D N=2 harmonic/projective superspace.Comment: 29 pages; V2: typos corrected, references and comments added; V3:
  eqs. (5.11) and (6.10) modified, reference adde
Fractional branes, warped compactifications and backreacted orientifold
  planes

The standard extremal p-brane solutions in supergravity are known to allow
for a generalisation which consists of adding a linear dependence on the
world-volume coordinates to the usual harmonic function. In this note we
demonstrate that remarkably this generalisation goes through in exactly the
same way for p-branes with fluxes added to it that correspond to fractional
p-branes. We relate this to warped orientifold compactifications by trading the
Dp-branes for Op-planes that solve the RR tadpole condition. This allows us to
interpret the worldvolume dependence as due to lower-dimensional scalars that
flow along the massless directions in the no-scale potential. Depending on the
details of the fluxes these flows can be supersymmetric domain wall flows. Our
solutions provide explicit examples of backreacted orientifold planes in
compactifications with non-constant moduli.Comment: 20 pages, incl. references. v2: small changes required for JHEP
  publication. v3: few equation typos correcte
The limit of N=(2,2) superconformal minimal models

The limit of families of two-dimensional conformal field theories has
recently attracted attention in the context of AdS/CFT dualities. In our work
we analyse the limit of N=(2,2) superconformal minimal models when the central
charge approaches c=3. The limiting theory is a non-rational N=(2,2)
superconformal theory, in which there is a continuum of chiral primary fields.
We determine the spectrum of the theory, the three-point functions on the
sphere, and the disc one-point functions.Comment: 37 pages, 3 figures; v2: minor corrections in section 5.3, version to
  be published in JHE
Nonplanar integrability at two loops

In this article we compute the action of the two loop dilatation operator on
restricted Schur polynomials that belong to the su(2) sector, in the displaced
corners approximation. In this non-planar large N limit, operators that
diagonalize the one loop dilatation operator are not corrected at two loops.
The resulting spectrum of anomalous dimensions is related to a set of decoupled
harmonic oscillators, indicating integrability in this sector of the theory at
two loops. The anomalous dimensions are a non-trivial function of the 't Hooft
coupling, with a spectrum that is continuous and starting at zero at large N,
but discrete at finite N.Comment: version to appear in JHE