pinecone/core-2020-05-10-deduplication huggingface dataset:
Holographic entanglement entropy in nonlocal theories

We compute holographic entanglement entropy in two strongly coupled nonlocal
field theories: the dipole and the noncommutative deformations of SYM theory.
We find that entanglement entropy in the dipole theory follows a volume law for
regions smaller than the length scale of nonlocality and has a smooth
cross-over to an area law for larger regions. In contrast, in the
noncommutative theory the entanglement entropy follows a volume law for up to a
critical length scale at which a phase transition to an area law occurs. The
critical length scale increases as the UV cutoff is raised, which is indicative
of UV/IR mixing and implies that entanglement entropy in the noncommutative
theory follows a volume law for arbitrary large regions when the size of the
region is fixed as the UV cutoff is removed to infinity. Comparison of
behaviour between these two theories allows us to explain the origin of the
volume law. Since our holographic duals are not asymptotically AdS, minimal
area surfaces used to compute holographic entanglement entropy have novel
behaviours near the boundary of the dual spacetime. We discuss implications of
our results on the scrambling (thermalization) behaviour of these nonlocal
field theories.Comment: 26 pages, 9 figure
Scalar sector properties of two-Higgs-doublet models with a global U(1)
  symmetry

We analyze the scalar sector properties of a general class of
two-Higgs-doublet models which has a global U(1) symmetry in the quartic terms.
We find constraints on the parameters of the potential from the considerations
of unitarity of scattering amplitudes, the global stability of the potential
and the $\rho$-parameter. We concentrate on the spectrum of the non-standard
scalar masses in the decoupling limit which is preferred by the Higgs data at
the LHC. We exhibit charged-Higgs induced contributions to the diphoton decay
width of the 125\,GeV Higgs boson and its correlation with the corresponding
$Z\gamma$ width.Comment: 12 pages, 15 eps figure files; minor modifications made and a few
  references adde
Inhomogeneous holographic thermalization

The sudden injection of energy in a strongly coupled conformal field theory
and its subsequent thermalization can be holographically modeled by a shell
falling into anti-de Sitter space and forming a black brane. For a homogeneous
shell, Bhattacharyya and Minwalla were able to study this process analytically
using a weak field approximation. Motivated by event-by-event fluctuations in
heavy ion collisions, we include inhomogeneities in this model, obtaining
analytic results in a long wavelength expansion. In the early-time window in
which our approximations can be trusted, the resulting evolution matches well
with that of a simple free streaming model. Near the end of this time window,
we find that the stress tensor approaches that of second-order viscous
hydrodynamics. We comment on possible lessons for heavy ion phenomenology.Comment: 53 pages, 10 figures; v2: references adde
On Holographic Weyl Anomaly

We use the relation between certain diffeomorphisms in the bulk and Weyl
transformations on the boundary to build the conformal structure of the metric
in the presence of matter in the bulk. We explicitly obtain the conformal
anomaly in any spacetime dimension d in a holographic frame work in the case of
gravity coupled to the scalar fields. This way we also provide a holographic
construction of the bulk spacetime metric and of the matter fields in the bulk
of this spacetime out of sources that are related to conformal field theory
data. With the latter, we produce an asymptotic expansion of the bulk fields
and scalar fields near the boundary in terms of spacetime dimension in the
context of the AdS/CFT correspondence. We work out both the gravitational and
matter conformal anomalies of the boundary theory as a coefficient of the
infrared logarithmic divergence that appears in the on-shell action.Comment: 39 pages, Latex file, no figure; v3: references added, to appear in
  JHE
The 1/2 BPS Wilson loop in ABJ(M) at two loops: The details

We compute the expectation value of the 1/2 BPS circular Wilson loop operator
in ABJ(M) theory at two loops in perturbation theory. Our result turns out to
be in exact agreement with the weak coupling limit of the prediction coming
from localization, including finite N contributions associated to non-planar
diagrams. It also confirms the identification of the correct framing factor
that connects framing-zero and framing-one expressions, previously proposed.
The evaluation of the 1/2 BPS operator is made technically difficult in
comparison with other observables of ABJ(M) theory by the appearance of
integrals involving the coupling between fermions and gauge fields, which are
absent for instance in the 1/6 BPS case. We describe in detail how to
analytically solve these integrals in dimensional regularization with
dimensional reduction (DRED). By suitably performing the physical limit to
three dimensions we clarify the role played by short distance divergences on
the final result and the mechanism of their cancellation.Comment: 54 pages, 2 figure
Light staus and enhanced Higgs diphoton rate with non-universal gaugino
  masses and SO(10) Yukawa unification

It is shown that substantially enhanced Higgs to diphoton rate induced by
light staus with large left-right mixing in MSSM requires at the GUT scale
non-universal gaugino masses with bino and/or wino lighter than gluino. The
possibility of such enhancement is investigated in MSSM models with arbitrary
gaugino masses at the GUT scale with additional restriction of top-bottom-tau
Yukawa unification, as predicted by minimal SO(10) GUTs. Many patterns of
gaugino masses leading to enhanced Higgs to diphoton rate and the Yukawa
unification are identified. Some of these patterns can be accommodated in a
well-motivated scenarios such as mirage mediation or SUSY breaking F-terms
being a non-singlet of SO(10). Phenomenological implications of a scenario with
non-universal gaugino masses generated by a mixture of the singlet F-term and
the F-term in a 24-dimensional representation of SU(5) $\subset$ SO(10) are
studied in detail. Possible non-universalities of other soft terms generated by
such F-terms are discussed. The enhancement of Higgs to diphoton rate up to 30%
can be obtained in agreement with all phenomenological constraints, including
vacuum metastability bounds. The lightest sbottom and pseudoscalar Higgs are
within easy reach of the 14 TeV LHC. The LSP can be either bino-like or
wino-like. The thermal relic abundance in the former case may be in agreement
with the cosmological data thanks to efficient stau coannihilation.Comment: 28 pages, 8 figures, comments and references added, matches published
  versio
Status of $Y=0$ Triplet Higgs with supersymmetry in the light of $\sim
  125$ GeV Higgs discovery

We study the $Y=0$ triplet extended supersymmetric model in the light of the
recent Higgs boson discovery. We calculate full one loop Higgs mass spectrum in
this model where the possible doublet-triplet mixing is considered in the
charged Higgs sector. This mixing changes the prediction of
$\mathcal{B}r(B_s\to X_s \gamma)$ in this model, compared to the MSSM. The
constraints from the $\sim 125$ GeV Higgs along with $\mathcal{B}r(B_s\to X_s
\gamma)$ are incorporated to find out the allowed parameter space. The lower
bounds on the third generation squark masses coming from 125 GeV Higgs are
rather week in this scenario compared to most constrained supersymmetric
scenarios, e.g. a 200 GeV squark mass is still possible.Comment: 25 pages, 32 figures, JHEP styl
The String Origin of SUSY Flavor Violation

We argue that in large classes of string compactifications with a MSSM-like
structure substantial flavor violating SUSY-breaking soft terms are generically
induced. We specify to the case of flavor dependent soft-terms in type
IIB/F-theory SU(5) unified models, although our results can be easily extended
to other settings. The Standard Model (SM) degrees of freedom reside in a local
system of 7-branes wrapping a 4-fold S in the extra dimensions. It is known
that in the presence of closed string 3-form fluxes SUSY-breaking terms are
typically generated. We explore the generation dependence of these soft terms
and find that non-universalities arise whenever the flux varies over the 4-fold
S. These non-universalities are parametrically suppressed by
(M_{GUT}/M_{Pl})^{1/3}. They also arise in the case of varying open string
fluxes, in this case parametrically suppressed by \alpha_{GUT}^{1/2}. For a
standard unification scheme with M_{GUT} = 10^{16} GeV and \alpha_{\rm GUT} =
1/24 these suppressions are very mild. Although limits from the kaon mass
difference \Delta m_K are easily obeyed for squark masses above the present LHC
limits, constraints from the CP-violation parameter \epsilon_K imply squark
masses in the multi-TeV region. The constraints from BR(\mu \rightarrow
e\gamma) turn out to be the strongest ones, with slepton masses of order ~10
TeV or heavier required to obey the experimental limits. These sfermion masses
are consistent with the observed large value m_H ~ 126 GeV of the Higgs mass.
We discuss under what conditions such strong limits may be relaxed allowing for
SUSY particle production at LHC.Comment: 38 pages, 6 figures, 1 table; v2: references adde
An updated analysis of radion-higgs mixing in the light of LHC data

We explore the constraints on the parameter space of a Randall-Sundrum warped
geometry scenario, where a radion field arises out of the attempt to stabilise
the radius of the extra compact spacelike dimension, using the most recent data
from higgs searches at the Large Hadron Collider (LHC) and the Tevatron. We
calculate contributions from both the scalar mass eigenstates arising from
radion-higgs kinetic mixing in all important search channels. The most
important channel to be affected is the decay via WW*, where no invariant mass
peak can discern the two distinct physical states. Improving upon the previous
studies, we perform a full analysis in the WW* channel, taking into account the
effect of various cuts and interference when the two scalar are closely spaced.
We examine both cases where the experimentally discovered scalar is either
'higgs-like' or 'radion-like'. The implications of a relatively massive scalar
decaying into a pair of 125 GeV scalars is also included. Based on a global
analysis of the current data, including not only a single 125 GeV scalar but
also another one with mass over the range 110 to 600 GeV, we obtain the
up-to-date exclusion contours in the parameter space. Side by side, regions
agreeing with the data within 68% and 95% confidence level based on a
\chi^2-minimisation procedure, are also presented
3D Supergravity from wrapped D3-branes

AdS_3 solutions dual to N = (0,2) SCFTs arise when D3-branes wrap Kahler
two-cycles in manifolds with SU(4) holonomy. Here we review known AdS_3
solutions and identify the corresponding three-dimensional gauged
supergravities, solutions of which uplift to type IIB supergravity. In
particular, we discuss gauged supergravities dual to twisted compactifications
on Riemann surfaces of both N=4 SYM and N =1 SCFTs with Sasaki-Einstein duals.
We check in each case that c-extremization gives the exact central charge and R
symmetry. For completeness, we also study AdS_3 solutions from intersecting
D3-branes, generalise recent KK reductions of Detournay & Guica and identify
the underlying gauged supergravities. Finally, we discuss examples of
null-warped AdS_3 solutions to three-dimensional gauged supergravity, all of
which embed in string theory.Comment: v1 48 pages; v2 two references added, to appear in JHE
Localization on Three-Manifolds

We consider supersymmetric gauge theories on Riemannian three-manifolds with
the topology of a three-sphere. The three-manifold is always equipped with an
almost contact structure and an associated Reeb vector field. We show that the
partition function depends only on this vector field, giving an explicit
expression in terms of the double sine function. In the large N limit our
formula agrees with a recently discovered two-parameter family of dual
supergravity solutions. We also explain how our results may be applied to prove
vortex-antivortex factorization. Finally, we comment on the extension of our
results to three-manifolds with non-trivial fundamental group.Comment: 34 pages; v2: discussion of vortex factorization added; v3: minor
  correction
Scale dependence and collinear subtraction terms for Higgs production in
  gluon fusion at N3LO

The full, explicit, scale dependence of the inclusive N3LO cross section for
single Higgs hadroproduction is obtained by calculating the convolutions of
collinear splitting kernels with lower-order partonic cross sections. We
provide results for all convolutions of splitting kernels and lower-order
partonic cross sections to the order in epsilon needed for the full N3LO
computation, as well as their expansions around the soft limit. We also discuss
the size of the total scale uncertainty at N3LO that can be anticipated with
existing information.Comment: 27 pages, 8 figure, 1 table, 8 ancillary files. v2: added 4
  references, changed labelling of contour plot
Heterotic warped Eguchi-Hanson spectra with five-branes and line bundles

We consider heterotic strings on a warped Eguchi-Hanson space with five-brane
and line bundle gauge fluxes. The heterotic string admits an exact CFT
description in terms of an asymmetrically gauged SU(2)xSL(2,R) WZW model, in a
specific double scaling limit in which the blow-up radius and the string scale
are sent to zero simultaneously. This allows us to compute the perturbative 6D
spectra for these models in two independent fashions: i) Within the
supergravity approximation we employ a representation dependent index; ii) In
the double scaling limit we determine all marginal vertex operators of the
coset CFT. To achieve agreement between the supergravity and the CFT spectra,
we conjecture that the untwisted and the twisted CFT states correspond to the
same set of hyper multiplets in supergravity. This is in a similar spirit as a
conjectured duality between asymptotically linear dilaton CFTs and little
string theory living on NS-five-branes. As the five-brane charge is
non-vanishing, heterotic (anti-)five-branes have to be added in order to cancel
irreducible gauge anomalies. The local spectra can be combined in such a way
that supersymmetry is preserved on the compact resolved T^4/Z_2 orbifold by
choosing the local gauge fluxes appropriately.Comment: 1+36 pages LaTe
Particles with non abelian charges

Efficient methods for describing non abelian charges in worldline approaches
to QFT are useful to simplify calculations and address structural properties,
as for example color/kinematics relations. Here we analyze in detail a method
for treating arbitrary non abelian charges. We use Grassmann variables to take
into account color degrees of freedom, which however are known to produce
reducible representations of the color group. Then we couple them to a U(1)
gauge field defined on the worldline, together with a Chern-Simons term, to
achieve projection on an irreducible representation. Upon gauge fixing there
remains a modulus, an angle parametrizing the U(1) Wilson loop, whose
dependence is taken into account exactly in the propagator of the Grassmann
variables. We test the method in simple examples, the scalar and spin 1/2
contribution to the gluon self energy, and suggest that it might simplify the
analysis of more involved amplitudes.Comment: 14 page
Quantum black hole entropy and the holomorphic prepotential of N=2
  supergravity

Supersymmetric terms in the effective action of N=2 supergravity in four
dimensions are generically classified into chiral-superspace integrals and
full-superspace integrals. For a theory of N=2 vector multiplets coupled to
supergravity, a special class of couplings is given by chiral-superspace
integrals that are governed by a holomorphic prepotential function. The quantum
entropy of BPS black holes in such theories depends on the prepotential
according to a known integral formula. We show, using techniques of
localization, that a large class of full-superspace integrals in the effective
action of N=2 supergravity do not contribute to the quantum entropy of BPS
black holes at any level in the derivative expansion. Our work extends similar
results for semi-classical supersymmetric black hole entropy, and goes towards
providing an explanation of why the prepotential terms capture the exact
microscopic quantum black hole entropy.Comment: 22 page
Euclidian 4d quantum gravity with a non-trivial measure term

We explore an extended coupling constant space of 4d regularized Euclidean
quantum gravity, defined via the formalism of dynamical triangulations. We add
a measure term which can also serve as a generalized higher curvature term and
determine the phase diagram and the geometries dominating in the various
regions. A first order phase transition line is observed, but no second order
transition point is located. As a consequence we cannot attribute any continuum
physics interpretation to the so-called crinkled phase of 4d dynamical
triangulations.Comment: 24 pages and many figures. A few references added in v
Stochastic Background of Gravitational Waves from Fermions -- Theory and
  Applications

Out-of-equilibrium fermions can be created in the early Universe by
non-perturbative parametric effects, both at preheating or during the thermal
era. An anisotropic stress is developed in the fermion distribution, acting as
a source of a stochastic background of gravitational waves (GW). We derive a
general formalism to calculate the spectrum of GW produced by an ensemble of
fermions, which we apply to a variety of scenarios after inflation. We discuss
in detail the regularization of the source, i.e. of the unequal-time-correlator
of the fermions' transverse-traceless anisotropic stress. We discuss how the GW
spectrum builds up in time and present a simple parametrization of its final
amplitude and peak frequency. We find that fermions may generate a GW
background with a significant amplitude at very high frequencies, similarly to
the case of preheating with scalar fields. A detection of this GW background
would shed light about the physics of the very early Universe, but new
technology at high frequencies is required, beyond the range accessible to
currently planned detectors.Comment: 62 pages, 7 figures (updated to match published version in JHEP
Ghost-Free Derivative Interactions for a Massive Graviton

If the kinetic interactions of a Lorentz-invariant massive graviton are
Einstein-Hilbert, then the only possible potential terms free from the
Boulware-Deser ghost are those of de Rham, Gabadadze and Tolley (dRGT). We
point out there are other possibilities if the kinetic terms are not required
to be Einstein-Hilbert. We construct pseudo-linear ghost-free potentials, terms
that derive in a natural way from the linear theory. The simplicity of this
approach allows us to construct diffeomorphism non-invariant higher-derivative
interaction terms that do not introduce ghosts. We conjecture that these terms
should have counterparts in the full dRGT theory. These terms would introduce
new free parameters into the theory and may change some of the conclusions
heretofore drawn.Comment: 21 pages. v4 typo in equations with vectors fixed agai
A Naturally Light Sterile neutrino in an Asymmetric Dark Matter Model

A recently proposed asymmetric mirror dark matter model where the mirror
sector is connected with the visible one by a right handed neutrino portal, is
shown to lead naturally to a 3+1 active-sterile neutrino spectrum, if the
portal consists only of two right handed neutrinos. At the tree level the model
has four massless neutrino states, three active and one sterile. The active
neutrinos pick up tiny masses via the minimal radiative inverse seesaw
mechanism at the one loop level. The loop effects also generate the large solar
and atmospheric mixings, as well as the observed reactor mixing for certain
range of parameters of the model. The dominant contribution to the sterile
neutrino mass ($\sim$ eV) arises from the gravitationally induced dimension-5
operators. Generating active-sterile mixing requires a two Higgs doublet
extension of SM and a small mixing between the ordinary and mirror Higgs
fields, which occurs naturally in mirror models.Comment: 18 pages, 4 figures, 2 tables, text minorly modified, one figure
  added, typos and lapses corrected, references updated, version published in
  JHE
Minimal Signatures of Naturalness

We study the naturalness problem using a model independent bottom up approach
by considering models where only the interaction terms needed to cancel the
Higgs quadratic divergences are present. If quadratic divergences are canceled
by terms linear in the Higgs field, then the collider phenomenology is well
covered by current electroweakino and fourth generation searches. If quadratic
divergences are canceled by terms bilinear in the Higgs field, then the
signatures are highly dependent on the quantum numbers of the new particles.
Precision Higgs measurements can reveal the presence of new particles with
either vevs or Standard Model charges. If the new particles are scalar dark
matter candidates, their direct and indirect detection signatures will be
highly correlated and within the reach of XENON100 and Fermi. Observation at
one of these experiments would imply observation at the other one. Observable
LHC decay channels can also arise if the new particles mix with lighter states.
This decay channel involves only the Higgs boson and not the gauge bosons.
Observation of such decays would give evidence that the new particle is tied to
the naturalness problem.Comment: 14 pages + appendix, journal versio
Semiclassical Strings on Curved Branes

We study semiclassical strings in the near horizon geometry of certain curved
branes. We investigate the rigidly rotating strings in the near horizon
geometry of NS5-branes wrapped on AdS3 x S3 and in the presence of background
NS-NS flux. We study several string solutions corresponding to giant magnon,
single spike and more general folded strings for the fundamental string in this
background. We comment that in the S-dual background the situation changes
drastically.Comment: 22 pages, JHEP styl
Wilson Lines and Entanglement Entropy in Higher Spin Gravity

Holographic entanglement entropy provides a direct connection between
classical geometry and quantum entanglement; however the usual prescription
does not apply to theories of higher spin gravity, where standard notions of
geometry are no longer gauge invariant. We present a proposal for the
holographic computation of entanglement entropy in field theories dual to
higher spin theories of gravity in AdS3. These theories have a Chern-Simons
description, and our proposal involves a Wilson line in an infinite-dimensional
representation of the bulk gauge group. In the case of spin-2 gravity such
Wilson lines are the natural coupling of a heavy point particle to gravity and
so are equivalent to the usual prescription of Ryu and Takayanagi. For higher
spin gravity they provide a natural generalization of these ideas. We work out
spin-3 gravity in detail, showing that our proposal recovers many expected
results and computes thermal entropies of black holes with higher spin charge,
finding agreement with previous expressions in the literature. We encounter
some peculiarities in the case of non-unitary RG flow backgrounds and outline
future generalizations.Comment: 52 pages + appendices, 5 figures; v2: references added, expanded
  discussion in Appendix C; v3: minor typos corrected, accepted version JHEP;
  v4: minor typos correcte