pinecone/core-2020-05-10-deduplication huggingface dataset:
Cosmological vacuum selection and metastable susy breaking

We study gauge mediation in a wide class of O'Raifeartaigh type models where
supersymmetry breaking metastable vacuum is created by gravity and/or quantum
corrections. We examine their thermal evolution in the early universe and the
conditions under which the susy breaking vacuum can be selected. It is
demonstrated that thermalization typically makes the metastable supersymmetry
breaking cosmologically disfavoured but this is not always the case. Initial
conditions with the spurion displaced from the symmetric thermal minimum and a
small coupling to the messenger sector can result in the realization of the
susy breaking vacuum even if the reheating temperature is high. We show that
this can be achieved without jeopardizing the low energy phenomenology. In
addition, we have found that deforming the models by a supersymmetric mass term
for messengers in such a way that the susy breaking minimum and the susy
preserving minima are all far away from the origin does not change the
conclusions. The basic observations are expected to hold also in the case of
models with an anomalous U(1) group.Comment: 28 pages, 4 figures, plain Latex, journal versio
Boundary operators in minimal Liouville gravity and matrix models

We interpret the matrix boundaries of the one matrix model (1MM) recently
constructed by two of the authors as an outcome of a relation among FZZT
branes. In the double scaling limit, the 1MM is described by the (2,2p+1)
minimal Liouville gravity. These matrix operators are shown to create a
boundary with matter boundary conditions given by the Cardy states. We also
demonstrate a recursion relation among the matrix disc correlator with two
different boundaries. This construction is then extended to the two matrix
model and the disc correlator with two boundaries is compared with the
Liouville boundary two point functions. In addition, the realization within the
matrix model of several symmetries among FZZT branes is discussed.Comment: 26 page
The Tevatron at the Frontier of Dark Matter Direct Detection

Direct detection of dark matter (DM) requires an interaction of dark matter
particles with nucleons. The same interaction can lead to dark matter pair
production at a hadron collider, and with the addition of initial state
radiation this may lead to mono-jet signals. Mono-jet searches at the Tevatron
can thus place limits on DM direct detection rates. We study these bounds both
in the case where there is a contact interaction between DM and the standard
model and where there is a mediator kinematically accessible at the Tevatron.
We find that in many cases the Tevatron provides the current best limit,
particularly for light dark matter, below 5 GeV, and for spin dependent
interactions. Non-standard dark matter candidates are also constrained. The
introduction of a light mediator significantly weakens the collider bound. A
direct detection discovery that is in apparent conflict with mono-jet limits
will thus point to a new light state coupling the standard model to the dark
sector. Mono-jet searches with more luminosity and including the spectrum shape
in the analysis can improve the constraints on DM-nucleon scattering cross
section.Comment: 20 pages, 8 figures, final version in JHE
Pure General Gauge Mediation for Early LHC Searches

We present benchmark points for Pure General Gauge Mediation (GGM) models
specifically optimised for early LHC searches. The pure GGM set-up is as
defined in our previous paper arXiv:0910.2674: namely we adopt the minimal
set-up in which B_mu is generated only through gauge interactions, and as a
result tan beta is a prediction rather than an input. The only input parameters
are messenger masses together with two independent scales which generate
gaugino and scalar masses. The parameter space favoured by current experimental
data includes an interesting region with light gluinos (m_g < 500 GeV and
relatively heavy squarks) and a bino-like NLSP where early discovery is likely.
We also find interesting regions of parameter space where the NLSP is a stau or
stau/neutralino co-NLSP and the squark masses are relatively low. We present
benchmark points which are typical for each of these three regions, and give
the spectrum, branching ratios, and also the overall 2 -> 2 cross-sections.
This data in SLHA format can be found at http://www.ippp.dur.ac.uk/~SUSYComment: 22 pages, 6 figures. Version 2: added discussion of Tevatron limit
Cosmology of the selfaccelerating third order Galileon

In this paper we start from the original formulation of the galileon model
with the original choice for couplings to gravity. Within this framework we
find that there is still a subset of possible Lagrangians that give
selfaccelerating solutions with stable spherically symmetric solutions. This is
a certain constrained subset of the third order galileon which has not been
explored before. We develop and explore the background cosmological evolution
of this model drawing intuition from other even more restricted galileon
models. The numerical results confirm the presence of selfacceleration, but
also reveals a possible instability with respect to galileon perturbations.Comment: 30 pages, 24 figure
E7(7) symmetry in perturbatively quantised N=8 supergravity

We study the perturbative quantisation of N=8 supergravity in a formulation
where its E7(7) symmetry is realised off-shell. Relying on the cancellation of
SU(8) current anomalies we show that there are no anomalies for the
non-linearly realised E7(7) either; this result extends to all orders in
perturbation theory. As a consequence, the e7(7) Ward identities can be
consistently implemented and imposed at all orders in perturbation theory, and
therefore potential divergent counterterms must in particular respect the full
non-linear E7(7) symmetry.Comment: Corrected version for publication in JHEP. 79 page
Next-to-leading order QCD predictions for W+W+jj production at the LHC

Because the LHC is a proton-proton collider, sizable production of two
positively charged W-bosons in association with two jets is possible. This
process leads to a distinct signature of same sign high-pt leptons, missing
energy and jets. We compute the NLO QCD corrections to the QCD-mediated part of
pp -> W+W+jj. These corrections reduce the dependence of the production
cross-section on the renormalization and factorization scale to about +- 10
percent. We find that a large number of W+W+jj events contain a relatively hard
third jet. The presence of this jet should help to either pick up the W+W+jj
signal or to reject it as an unwanted background.Comment: 15 pages, 5 (lovely) figures, v3 accepted for publication in JHEP,
  corrects tables in appendi
Thermodynamical Metrics and Black Hole Phase Transitions

An important phase transition in black hole thermodynamics is associated with
the divergence of the specific heat with fixed charge and angular momenta, yet
one can demonstrate that neither Ruppeiner's entropy metric nor Weinhold's
energy metric reveals this phase transition. In this paper, we introduce a new
thermodynamical metric based on the Hessian matrix of several free energy. We
demonstrate, by studying various charged and rotating black holes, that the
divergence of the specific heat corresponds to the curvature singularity of
this new metric. We further investigate metrics on all thermodynamical
potentials generated by Legendre transformations and study correspondences
between curvature singularities and phase transition signals. We show in
general that for a system with n-pairs of intensive/extensive variables, all
thermodynamical potential metrics can be embedded into a flat (n,n)-dimensional
space. We also generalize the Ruppeiner metrics and they are all conformal to
the metrics constructed from the relevant thermodynamical potentials.Comment: Latex, 25 pages, reference added, typos corrected, English polished
  and the Hawking-Page phase transition clarified; to appear in JHE
Stabilizing All Kahler Moduli in Type IIB Orientifolds

We describe a simple and robust mechanism that stabilizes all Kahler moduli
in Type IIB orientifold compactifications. This is shown to be possible with
just one non-perturbative contribution to the superpotential coming from either
a D3-instanton or D7-branes wrapped on an ample divisor. This
moduli-stabilization mechanism is similar to and motivated by the one used in
the fluxless G_2 compactifications of M-theory. After explaining the general
idea, explicit examples of Calabi-Yau orientifolds with one and three Kahler
moduli are worked out. We find that the stabilized volumes of all two- and
four-cycles as well as the volume of the Calabi-Yau manifold are controlled by
a single parameter, namely, the volume of the ample divisor. This feature would
dramatically constrain any realistic models of particle physics embedded into
such compactifications. Broad consequences for phenomenology are discussed, in
particular the dynamical solution to the strong CP-problem within the
framework.Comment: RevTeX, 24 pages, 2 tables, 1 figure
Numerical Study of the Two Color Attoworld

We consider QCD at very low temperatures and non-zero quark chemical
potential from lattice Monte Carlo simulations of the two-color theory in a
very small spatial volume (the attoscale). In this regime the quark number
rises in discrete levels in qualitative agreement with what is found
analytically at one loop on S3xS1 with radius R_S3 << 1/{\Lambda}_QCD. The
detailed level degeneracy, however, cannot be accounted for using weak coupling
arguments. At each rise in the quark number there is a corresponding spike in
the Polyakov line, also in agreement with the perturbative results. In addition
the quark number susceptibility shows a similar behaviour to the Polyakov line
and appears to be a good indicator of a confinement-deconfinement type of
transition.Comment: 18 pages, 10 figure
Corrections to Nambu-Goto energy levels from the effective string action

The effective action on long strings, such as confining strings in pure
Yang-Mills theories, is well-approximated by the Nambu-Goto action, but this
action cannot be exact. The leading possible corrections to this action (in a
long string expansion in the static gauge), allowed by Lorentz invariance, were
recently identified, both for closed strings and for open strings. In this
paper we compute explicitly in a Hamiltonian formalism the leading corrections
to the lowest-lying Nambu-Goto energy levels in both cases, and verify that
they are consistent with the previously computed effective string partition
functions. For open strings of length R the leading correction is of order
1/R^4, for excited closed strings of length R in D>3 space-time dimensions it
is of order 1/R^5, while for the ground state of the closed string in any
dimension it is of order 1/R^7. We attempt to match our closed string
corrections to lattice results, but the latter are still mostly outside the
range of convergence of the 1/R expansion that we use.Comment: 18 pages, 1 figure, JHEP format. v2: added remark on 1/R^7
  corrections to ground state energ
Maximally Supersymmetric Yang-Mills in five dimensions in light-cone
  superspace

We formulate maximally supersymmetric Yang-Mills theory in five dimensions in
light-cone superspace. The light-cone Hamiltonian is of the quadratic form and
the theory can be understood as an oxidation of the N=4 Super Yang-Mills Theory
in four dimensions. We specifically study three-point counterterms and show how
these counterterms vanish on-shell. This study is a preliminary to set up the
technique in order to study possible four-point counterterms.Comment: 25 pages, typos corrected, references adde
Gravity/Spin-model correspondence and holographic superfluids

We propose a general correspondence between gravity and spin models, inspired
by the well-known IR equivalence between lattice gauge theories and the spin
models. This suggests a connection between continuous type Hawking-phase
transitions in gravity and the continuous order-disorder transitions in
ferromagnets. The black-hole phase corresponds to the ordered and the graviton
gas corresponds to the disordered phases respectively. A simple set-up based on
Einstein-dilaton gravity indicates that the vicinity of the phase transition is
governed by a linear-dilaton CFT. Employing this CFT we calculate scaling of
observables near T_c, and obtain mean-field scaling in a semi-classical
approximation. In case of the XY model the Goldstone mode is identified with
the zero mode of the NS-NS two-form. We show that the second speed of sound
vanishes at the transition also with the mean field exponent.Comment: 68 pages + appendices, 4 figures; v2: the published version -
  discussion in section 2 extended, typos corrected, new referenced adde
Ultraviolet singularities in classical brane theory

We construct for the first time an energy-momentum tensor for the
electromagnetic field of a p-brane in arbitrary dimensions, entailing finite
energy-momentum integrals. The construction relies on distribution theory and
is based on a Lorentz-invariant regularization, followed by the subtraction of
divergent and finite counterterms supported on the brane. The resulting
energy-momentum tensor turns out to be uniquely determined. We perform the
construction explicitly for a generic flat brane. For a brane in arbitrary
motion our approach provides a new paradigm for the derivation of the,
otherwise divergent, self-force of the brane. The so derived self-force is
automatically finite and guarantees, by construction, energy-momentum
conservation.Comment: 41 pages, no figures, minor change
Unscreening the Gaugino Mass with Chiral Messengers

Gaugino screening, the absence of next-to-leading order corrections to
gaugino masses, is a generic feature of gauge mediation models of supersymmetry
breaking. We show that in a specific class of models, known as semi-direct
gauge mediation, it is possible to avoid gaugino screening by allowing for a
chiral messenger sector. Messengers then acquire a mass at some scale, for
instance by higgsing or by some auxiliary strong coupling dynamics. We
implement this idea in a simple model which we work out explicitly.Comment: 17 pages, 3 figures. Minor clarifications added in Section 2, version
  to appear in JHE
The hidden horizon and black hole unitarity

We motivate through a detailed analysis of the Hawking radiation in a
Schwarzschild background a scheme in accordance with quantum unitarity. In this
scheme the semi-classical approximation of the unitary quantum - horizonless -
black hole S-matrix leads to the conventional description of the Hawking
radiation from a classical black hole endowed with an event horizon. Unitarity
is borne out by the detailed exclusive S-matrix amplitudes. There, the fixing
of generic out-states, in addition to the in-state, yields in asymptotic
Minkowski space-time saddle-point contributions which are dominated by
Planckian metric fluctuations when approaching the Schwarzschild radius. We
argue that these prevent the corresponding macroscopic "exclusive backgrounds"
to develop an event horizon. However, if no out-state is selected, a distinct
saddle-point geometry can be defined, in which Planckian fluctuations are
tamed. Such "inclusive background" presents an event horizon and constitutes a
coarse-grained average over the aforementioned exclusive ones. The classical
event horizon appears as a coarse-grained structure, sustaining the
thermodynamic significance of the Bekenstein-Hawking entropy. This is
reminiscent of the tentative fuzzball description of extremal black holes: the
role of microstates is played here by a complete set of out-states. Although
the computations of unitary amplitudes would require a detailed theory of
quantum gravity, the proposed scheme itself, which appeals to the metric
description of gravity only in the vicinity of stationary points, does not.Comment: 29 pages, 4 figures. Typos corrected. Two footnotes added (footnotes
  3 and 5
Particle Collisions on Stringy Black Hole Background

The collision of two particles in the background of a Sen black hole is
studied. With the equations of motion of the particles, the center-of-mass
energy is investigated when the collision takes place at the horizon of a Sen
black hole. For an extremal Sen black hole, we find that the center-of-mass
energy will be arbitrarily high with two conditions: (1) spin $a\neq 0$ and (2)
one of the colliding particles has the critical angular momentum
$l_{\text{c}}=2$. For a nonextremal Sen black hole, we show that, in order to
obtain an unlimited center-of-mass energy, one of the colliding particles
should have the critical angular momentum $l'_{\text{c}}=2 r_{+}/a$ ($r_{+}$ is
the radius of the outer horizon for a nonextremal black hole). However, a
particle with the angular momentum $l=l'_{\text{c}}$ could not approach the
black hole from outside of the horizon through free fall, which implies that
the collision with arbitrarily high center-of-mass energy could not take place.
Thus, there is an upper bound of the center-of-mass energy for the nonextremal
black hole. We also obtain the maximal center-of-mass energy for a
near-extremal black hole and the result implies that the Planck-scale energy is
hard to be approached. Furthermore, we also consider the back-reaction effects.
The result shows that, neglecting the gravitational radiation, it has a weak
effect on the center-of-mass energy. However, we argue that the maximum allowed
center-of-mass energy will be greatly reduced to below the Planck-scale when
the gravitational radiation is included.Comment: 17 pages, 4 figures, published versio
Ultraspinning instability of anti-de Sitter black holes

Myers-Perry black holes with a single spin in d>5 have been shown to be
unstable if rotating sufficiently rapidly. We extend the numerical analysis
which allowed for that result to the asymptotically AdS case. We determine
numerically the stationary perturbations that mark the onset of the
instabilities for the modes that preserve the rotational symmetries of the
background. The parameter space of solutions is thoroughly analysed, and the
onset of the instabilities is obtained as a function of the cosmological
constant. Each of these perturbations has been conjectured to represent a
bifurcation point to a new phase of stationary AdS black holes, and this is
consistent with our results.Comment: 22 pages, 7 figures. v2: Reference added. Matches published versio
Automation of the matrix element reweighting method

Matrix element reweighting is a powerful experimental technique widely
employed to maximize the amount of information that can be extracted from a
collider data set. We present a procedure that allows to automatically evaluate
the weights for any process of interest in the standard model and beyond. Given
the initial, intermediate and final state particles, and the transfer functions
for the final physics objects, such as leptons, jets, missing transverse
energy, our algorithm creates a phase-space mapping designed to efficiently
perform the integration of the squared matrix element and the transfer
functions. The implementation builds up on MadGraph, it is completely
automatized and publicly available. A few sample applications are presented
that show the capabilities of the code and illustrate the possibilities for new
studies that such an approach opens up.Comment: 41 pages, 21 figure
Holographic Superconductors in Quasi-topological Gravity

In this paper we study (3+1) dimensional holographic superconductors in
quasi-topological gravity which is recently proposed by R. Myers {\it et.al.}.
Through both analytical and numerical analysis, we find in general the
condensation becomes harder with the increase of coupling parameters of higher
curvature terms. In particular, comparing with those in ordinary Gauss-Bonnet
gravity, we find that positive cubic corrections in quasi-topological gravity
suppress the condensation while negative cubic terms make it easier. We also
calculate the conductivity numerically for various coupling parameters. It
turns out that the universal relation of $\omega_g/T_c\simeq 8$ is unstable and
this ratio becomes larger with the increase of the coupling parameters. A brief
discussion on the condensation from the CFT side is also presented.Comment: 23 pages, 28 figures, accepted for publication in JHE
Holographic 1/Nc correction from the chiral condensate

We investigate a gravity solution containing the gravitational backreaction
of the massive scalar field dual to the chiral condensate, which corresponds to
$1/N_c$ correction. In general, condensation changes the vacuum structure, so
the present dual geometry is appropriate to describe the chiral condensate
vacuum in the gauge theory side. After constructing the dual geometry
numerically and applying the hard wall model we study the effect of the $1/N_c$
correction on the lightest meson spectra, which improves the values for
lightest meson masses into the observations. In addition, we investigate the
chiral condensate dependence the binding energy of heavy quarkonium.Comment: 19 pages, 12 figure
Coherent quantum Boltzmann equations from cQPA

We reformulate and extend our recently introduced quantum kinetic theory for
interacting fermion and scalar fields. Our formalism is based on the coherent
quasiparticle approximation (cQPA) where nonlocal coherence information is
encoded in new spectral solutions at off-shell momenta. We derive explicit
forms for the cQPA propagators in the homogeneous background and show that the
collision integrals involving the new coherence propagators need to be resummed
to all orders in gradient expansion. We perform this resummation and derive
generalized momentum space Feynman rules including coherent propagators and
modified vertex rules for a Yukawa interaction. As a result we are able to set
up self-consistent quantum Boltzmann equations for both fermion and scalar
fields. We present several examples of diagrammatic calculations and numerical
applications including a simple toy model for coherent baryogenesis.Comment: 13 figures, 49 pages. Replaced with the published version. Typos and
  misprints corrected. Improved coloring in some figures. One new chapter (6.1)
  added. No changes on result
New Near Horizon Limit in Kerr/CFT

The extremal Kerr black hole with the angular momentum J is conjectured to be
dual to CFT with central charges c_L=c_R=12J. However, the central charge in
the right sector remains to be explicitly derived so far. In order to
investigate this issue, we introduce new near horizon limits of (near) extremal
Kerr and five-dimensional Myers-Perry black holes. We obtain Virasoro algebras
as asymptotic symmetries and calculate the central charges associated with
them. One of them is equivalent to that of the previous studies, and the other
is non-zero, but still the order of near extremal parameter. Redefining the
algebras to take the standard form, we obtain a finite value as expected by the
Kerr/CFT correspondence.Comment: 25 pages, minor changes, references adde
Superspace calculation of the four-loop spectrum in N=6 supersymmetric
  Chern-Simons theories

Using N=2 superspace techniques we compute the four-loop spectrum of single
trace operators in the SU(2) x SU(2) sector of ABJM and ABJ supersymmetric
Chern-Simons theories. Our computation yields a four-loop contribution to the
function h^2(\lambda) (and its ABJ generalization) in the magnon dispersion
relation which has fixed maximum transcendentality and coincides with the
findings in components given in the revised versions of arXiv:0908.2463 and
arXiv:0912.3460. We also discuss possible scenarios for an all-loop function
h^2(\lambda) that interpolates between weak and strong couplings.Comment: LaTeX, feynmp, 34 pages; v2: typos corrected, formulations improved,
  references adde