pinecone/core-2020-05-10-deduplication huggingface dataset:
Thermodynamic Geometry and Phase Transitions in Kerr-Newman-AdS Black
  Holes

We investigate phase transitions and critical phenomena in Kerr-Newman-Anti
de Sitter black holes in the framework of the geometry of their equilibrium
thermodynamic state space. The scalar curvature of these state space Riemannian
geometries is computed in various ensembles. The scalar curvature diverges at
the critical point of second order phase transitions for these systems.
Remarkably, however, we show that the state space scalar curvature also carries
information about the liquid-gas like first order phase transitions and the
consequent instabilities and phase coexistence for these black holes. This is
encoded in the turning point behavior and the multi-valued branched structure
of the scalar curvature in the neighborhood of these first order phase
transitions. We re-examine this first for the conventional Van der Waals
system, as a preliminary exercise. Subsequently, we study the Kerr-Newman-AdS
black holes for a grand canonical and two "mixed" ensembles and establish novel
phase structures. The state space scalar curvature bears out our assertion for
the first order phase transitions for both the known and the new phase
structures, and closely resembles the Van der Waals system.Comment: 1 + 41 pages, LaTeX, 46 figures. Discussions, clarifications and
  references adde
Towards strange metallic holography

We initiate a holographic model building approach to `strange metallic'
phenomenology. Our model couples a neutral Lifshitz-invariant quantum critical
theory, dual to a bulk gravitational background, to a finite density of gapped
probe charge carriers, dually described by D-branes. In the physical regime of
temperature much lower than the charge density and gap, we exhibit anomalous
scalings of the temperature and frequency dependent conductivity. Choosing the
dynamical critical exponent $z$ appropriately we can match the non-Fermi liquid
scalings, such as linear resistivity, observed in strange metal regimes. As
part of our investigation we outline three distinct string theory realizations
of Lifshitz geometries: from F theory, from polarised branes, and from a
gravitating charged Fermi gas. We also identify general features of
renormalisation group flow in Lifshitz theories, such as the appearance of
relevant charge-charge interactions when $z \geq 2$. We outline a program to
extend this model building approach to other anomalous observables of interest
such as the Hall conductivity.Comment: 71 pages, 8 figure
The conformal current algebra on supergroups with applications to the
  spectrum and integrability

We compute the algebra of left and right currents for a principal chiral
model with arbitrary Wess-Zumino term on supergroups with zero Killing form. We
define primary fields for the current algebra that match the affine primaries
at the Wess-Zumino-Witten points. The Maurer-Cartan equation together with
current conservation tightly constrain the current-current and current-primary
operator product expansions. The Hilbert space of the theory is generated by
acting with the currents on primary fields. We compute the conformal dimensions
of a subset of these states in the large radius limit. The current algebra is
shown to be consistent with the quantum integrability of these models to
several orders in perturbation theory.Comment: 45 pages. Minor correction
Field Theory for a Deuteron Quantum Liquid

Based on general symmetry principles we study an effective Lagrangian for a
neutral system of condensed spin-1 deuteron nuclei and electrons, at
greater-than-atomic but less-than-nuclear densities. We expect such matter to
be present in thin layers within certain low-mass brown dwarfs. It may also be
produced in future shock-wave-compression experiments as an effective fuel for
laser induced nuclear fusion. We find a background solution of the effective
theory describing a net spin zero condensate of deuterons with their spins
aligned and anti-aligned in a certain spontaneously emerged preferred
direction. The spectrum of low energy collective excitations contains two spin
waves with linear dispersions -- like in antiferromagnets -- as well as gapped
longitudinal and transverse modes related to the Meissner effect -- like in
superconductors. We show that counting of the Nambu-Goldstone modes of
spontaneously broken internal and space-time symmetries obeys, in a nontrivial
way, the rules of the Goldstone theorem for Lorentz non-invariant systems. We
discuss thermodynamic properties of the condensate, and its potential
manifestation in the low-mass brown dwarfs.Comment: 19 LaTeX pages; v2: 2 refs added, JHEP versio
Holography of AdS vacuum bubbles

We consider the fate of AdS vacua connected by tunneling events. A precise
holographic dual of thin-walled Coleman--de Luccia bounces is proposed in terms
of Fubini instantons in an unstable CFT. This proposal is backed by several
qualitative and quantitative checks, including the precise calculation of the
instanton action appearing in evaluating the decay rate. Big crunches manifest
themselves as time dependent processes which reach the boundary of field space
in a finite time. The infinite energy difference involved is identified on the
boundary and highlights the ill-defined nature of the bulk setup. We propose a
qualitative scenario in which the crunch is resolved by stabilizing the CFT, so
that all attempts at crunching always end up shielded from the boundary by the
formation of black hole horizons. In all these well defined bulk processes the
configurations have the same asymptotics and are finite energy excitations.Comment: version submitted to journal. Note added referring to previous work
  on holographic instantons
Effective action of three-dimensional extended supersymmetric matter on
  gauge superfield background

We study the low-energy effective actions for gauge superfields induced by
quantum N=2 and N=4 supersymmetric matter fields in three-dimensional Minkowski
space. Analyzing the superconformal invariants in the N=2 superspace we propose
a general form of the N=2 gauge invariant and superconformal effective action.
The leading terms in this action are fixed by the symmetry up to the
coefficients while the higher order terms with respect to the Maxwell field
strength are found up to one arbitrary function of quasi-primary N=2
superfields constructed from the superfield strength and its covariant spinor
derivatives. Then we find this function and the coefficients by direct quantum
computations in the N=2 superspace. The effective action of N=4 gauge multiplet
is obtained by generalizing the N=2 effective action.Comment: 1+27 pages; v2: minor corrections, references adde
The Heat Kernel on AdS_3 and its Applications

We derive the heat kernel for arbitrary tensor fields on S^3 and (Euclidean)
AdS_3 using a group theoretic approach. We use these results to also obtain the
heat kernel on certain quotients of these spaces. In particular, we give a
simple, explicit expression for the one loop determinant for a field of
arbitrary spin s in thermal AdS_3. We apply this to the calculation of the one
loop partition function of N=1 supergravity on AdS_3. We find that the answer
factorizes into left- and right-moving super Virasoro characters built on the
SL(2, C) invariant vacuum, as argued by Maloney and Witten on general grounds.Comment: 46 pages, LaTeX, v2: Reference adde
Theoretical Constraints on the Higgs Effective Couplings

We derive constraints on the sign of couplings in an effective Higgs
Lagrangian using prime principles such as the naturalness principle, global
symmetries, and unitarity. Specifically, we study four dimension-six operators,
O_H, O_y, O_g, and O_gamma, which contribute to the production and decay of the
Higgs boson at the Large Hadron Collider (LHC), among other things. Assuming
the Higgs is a fundamental scalar, we find: 1) the coefficient of O_H is
positive except when there are triplet scalars, resulting in a reduction in the
Higgs on-shell coupling from their standard model (SM) expectations if no other
operators contribute, 2) the linear combination of O_H and O_y controlling the
overall Higgs coupling to fermion is always reduced, 3) the sign of O_g induced
by a new colored fermion is such that it interferes destructively with the SM
top contribution in the gluon fusion production of the Higgs, if the new
fermion cancels the top quadratic divergence in the Higgs mass, and 4) the
correlation between naturalness and the sign of O_gamma is similar to that of
O_g, when there is a new set of heavy electroweak gauge bosons. Next
considering a composite scalar for the Higgs, we find the reduction in the
on-shell Higgs couplings persists. If further assuming a collective breaking
mechanism as in little Higgs theories, the coefficient of O_H remains positive
even in the presence of triplet scalars. In the end, we conclude that the gluon
fusion production of the Higgs boson is reduced from the SM rate in all
composite Higgs models. Our study suggests a wealth of information could be
revealed by precise measurements of the Higgs couplings, providing strong
motivations for both improving on measurements at the LHC and building a
precision machine such as the linear collider.Comment: 37 pages, one figure; v2: improved discussion on dispersion relation
  and other minor modifications; version accepted for publication
Supertwistor space for 6D maximal super Yang-Mills

6D maximal super Yang-Mills on-shell amplitudes are formulated in superspace
using 6 dimensional twistors. The 3,4,5-point tree amplitudes are obtained by
supersymmetrizing their bosonic counterparts and confirmed through the BCFW
construction. In contrast to 4D this superspace is non-chiral, reflecting the
fact that one cannot differentiate MHV from $\bar{{\rm MHV}}$ in 6D. Combined
with unitarity methods, this superspace should be useful for the study of
multi-loop D dimensional maximal super Yang-Mills and gravity amplitudes.
Furthermore, the non-chiral nature gives a natural framework for an off-shell
construction. We show this by matching our result with off-shell D=4 N=4 super
Yang-Mills amplitudes, expressed in projective superspace.Comment: 6 figures 28 pages. with better sign
The LHC Phenomenology of Vectorlike Confinement

We investigate in detail the LHC phenomenology of "vectorlike confinement",
where the Standard Model is augmented by a new confining gauge interaction and
new light fermions that carry vectorlike charges under both the Standard Model
and the new gauge group. If the new interaction confines at the TeV scale, this
framework gives rise to a wide range of exotic collider signatures such as the
production of a vector resonance that decays to a pair of collider-stable
charged massive particles (a "di-CHAMP" resonance), to a pair of
collider-stable massive colored particles (a "di-R-hadron resonance), to
multiple photons, $W$s and $Z$s via two intermediate scalars, and/or to
multi-jet final states. To study these signals at the LHC, we set up two
benchmark models: one for the di-CHAMP and multi-photon signals, and the other
for the di-R-hadron and multijet signals. For the di-CHAMP/multi-photon model,
Standard Model backgrounds are negligible, and we show that a full
reconstruction of the spectrum is possible, providing powerful evidence for
vectorlike confinement. For the di-R-hadron/multijet model, we point out that
in addition to the di-R-hadron signal, the rate of the production of four
R-hadrons can also be sizable at the LHC. This, together with the multi-jet
signals studied in earlier work, makes it possible to single out vectorlike
confinement as the underlying dynamics.Comment: 32 pages, 28 figures. Several typos fixed, one paragraph added
  elaborating choice of benchmarks. Version accepted by JHEP
Geometric flows in Horava-Lifshitz gravity

We consider instanton solutions of Euclidean Horava-Lifshitz gravity in four
dimensions satisfying the detailed balance condition. They are described by
geometric flows in three dimensions driven by certain combinations of the
Cotton and Ricci tensors as well as the cosmological-constant term. The
deformation curvature terms can have competing behavior leading to a variety of
fixed points. The instantons interpolate between any two fixed points, which
are vacua of topologically massive gravity with Lambda > 0, and their action is
finite. Special emphasis is placed on configurations with SU(2) isometry
associated with homogeneous but generally non-isotropic Bianchi IX model
geometries. In this case, the combined Ricci-Cotton flow reduces to an
autonomous system of ordinary differential equations whose properties are
studied in detail for different couplings. The occurrence and stability of
isotropic and anisotropic fixed points are investigated analytically and some
exact solutions are obtained. The corresponding instantons are classified and
they are all globally R x S^3 and complete spaces. Generalizations to
higher-dimensional gravities are also briefly discussed.Comment: 67 pages, 16 figures; more solutions found, 1 extra figure, 1 more
  reference added in v2; minor typos corrected in v3 (to appear in JHEP); an
  acknowledgement added in v
The QCD phase diagram at nonzero quark density

We determine the phase diagram of QCD on the μ - T plane for small to moderate chemical potentials. Two transition lines are defined with two quantities, the chiral condensate and the strange quark number susceptibility. The calculations are carried out on N t = 6, 8 and 10 lattices generated with a Symanzik improved gauge and stout-link improved 2+1 flavor staggered fermion action using physical quark masses. After carrying out the continuum extrapolation we find that both quantities result in a similar curvature of the transition line. Furthermore, our results indicate that in leading order the width of the transition region remains essentially the same as the chemical potential is increased. © SISSA 2011
On the generality of the LLM geometries in M-theory

In this note we revisit the Lin, Lunin, Maldacena (LLM) class of d=11
supergravity solutions with symmetry SO(6) X SO(3) X R, but generalise to allow
for all fluxes consistent with the isometries. Using the Killing spinor
equation, we prove there are no supersymmetric geometries with additional
fluxes beyond the LLM ansatz. In addition, the LLM relationship between Killing
spinors, \epsilon_- = - \gamma_5 \epsilon_+, may be seen as a consequence of
identifying two Killing directions identified through the Killing spinor
equation corresponding to candidate R-symmetry directions.Comment: 15 pages, v2. minor improvement
Flavor in Minimal Conformal Technicolor

We construct a complete, realistic, and natural UV completion of minimal
conformal technicolor that explains the origin of quark and lepton masses and
mixing angles. As in "bosonic technicolor", we embed conformal technicolor in a
supersymmetric theory, with supersymmetry broken at a high scale. The exchange
of heavy scalar doublets generates higher-dimension interactions between
technifermions and quarks and leptons that give rise to quark and lepton masses
at the TeV scale. Obtaining a sufficiently large top quark mass requires strong
dynamics at the supersymmetry breaking scale in both the top and technicolor
sectors. This is natural if the theory above the supersymmetry breaking also
has strong conformal dynamics. We present two models in which the strong top
dynamics is realized in different ways. In both models, constraints from
flavor-changing effects can be easily satisfied. The effective theory below the
supersymmetry breaking scale is minimal conformal technicolor with an
additional light technicolor gaugino. We argue that this light gaugino is a
general consequence of conformal technicolor embedded into a supersymmetric
theory. If the gaugino has mass below the TeV scale it will give rise to an
additional pseudo Nambu-Goldstone boson that is observable at the LHC.Comment: 37 pages; references adde
Massive Gravity: Exorcising the Ghost

We consider Higgs massive gravity [1,2] and investigate whether a nonlinear
ghost in this theory can be avoided. We show that although the theory
considered in [10,11] is ghost free in the decoupling limit, the ghost
nevertheless reappears in the fourth order away from the decoupling limit. We
also demonstrate that there is no direct relation between the value of the
Vainshtein scale and the existence of nonlinear ghost. We discuss how massive
gravity should be modified to avoid the appearance of the ghost.Comment: 16 page
Long-Range Rapidity Correlations in Heavy Ion Collisions at Strong
  Coupling from AdS/CFT

We use AdS/CFT correspondence to study two-particle correlations in heavy ion
collisions at strong coupling. Modeling the colliding heavy ions by shock waves
on the gravity side, we observe that at early times after the collision there
are long-range rapidity correlations present in the two-point functions for the
glueball and the energy-momentum tensor operators. We estimate rapidity
correlations at later times by assuming that the evolution of the system is
governed by ideal Bjorken hydrodynamics, and find that glueball correlations in
this state are suppressed at large rapidity intervals, suggesting that
late-time medium dynamics can not "wash out" the long-range rapidity
correlations that were formed at early times. These results may provide an
insight on the nature of the "ridge" correlations observed in heavy ion
collision experiments at RHIC and LHC, and in proton-proton collisions at LHC.Comment: 32 pages, 2 figures; v2: typos corrected, references adde
Differential geometry with a projection: Application to double field
  theory

In recent development of double field theory, as for the description of the
massless sector of closed strings, the spacetime dimension is formally doubled,
i.e. from D to D+D, and the T-duality is realized manifestly as a global O(D,D)
rotation. In this paper, we conceive a differential geometry characterized by a
O(D,D) symmetric projection, as the underlying mathematical structure of double
field theory. We introduce a differential operator compatible with the
projection, which, contracted with the projection, can be covariantized and may
replace the ordinary derivatives in the generalized Lie derivative that
generates the gauge symmetry of double field theory. We construct various gauge
covariant tensors which include a scalar and a tensor carrying two O(D,D)
vector indices.Comment: 1+22 pages, No figure; a previous result on 4-index tensor removed,
  presentation improve
An A_5 Model of Four Lepton Generations

We study the lepton sector of a four generations model based on the discrete
flavor group $A_5$ (the even permutation of five objects). The best features of
the three family $A_4$ model survive, including the tribimaximal pattern of
three generation neutrino mixings. At leading order the three light neutrino
mass relations of $m_{\nu_1} = m_{\nu_3}$ and $m_{\nu_2} = 0$ are predicted.
The splitting of the neutrino masses can be naturally obtained as a result of
the breaking of $A_{5}$ down to $A_4$ and a degenerate spectrum is preferred in
our model. In our $A_5$ model, the electron mass is zero at tree level, but
calculable through quantum corrections.Comment: 20 pages, 3 figures, and 3 tables; references and Appendix C added,
  version accepted for publication in JHE
Metastable Vacua in Warped Throats at Non-Isolated Singularities

We study the existence of metastable vacua in cascades based on fractional
brane configurations at non-isolated singularities preserving N = 1
supersymmetry. We find that in a large class of models the extra moduli
typically generated along such cascades may be stabilized by utilizing special
monopole points found recently. We illustrate this in detail for cascades based
on the SPP singularity. The supergravity interpretation of these constructions
in terms of warped throats with supersymmetry breaking localized near their
tips as well as applications to string compactification is discussed. Our
constructions are designed to realize a large class of warped throats with
supersymmetry breaking localized inside of a highly curved tip region.Comment: 18 pages, added clarifications, published version; 1 figur
Models of non-relativistic quantum gravity: the good, the bad and the
  healthy

Horava's proposal for non-relativistic quantum gravity introduces a preferred
time foliation of space-time which violates the local Lorentz invariance. The
foliation is encoded in a dynamical scalar field which we call `khronon'. The
dynamics of the khronon field is sensitive to the symmetries and other details
of the particular implementations of the proposal. In this paper we examine
several consistency issues present in three non-relativistic gravity theories:
Horava's projectable theory, the healthy non-projectable extension, and a new
extension related to ghost condensation. We find that the only model which is
free from instabilities and strong coupling is the non-projectable one. We
elaborate on the phenomenology of the latter model including a discussion of
the couplings of the khronon to matter. In particular, we obtain the parameters
of the post-Newtonian expansion in this model and show that they are compatible
with current observations.Comment: 50 pages, JHEP styl
Supersymmetric Consistent Truncations of IIB on T(1,1)

We study consistent Kaluza-Klein reductions of type IIB supergravity on
T(1,1) down to five-dimensions. We find that the most general reduction
containing singlets under the global SU(2)xSU(2) symmetry of T(1,1) is N=4
gauged supergravity coupled to three vector multiplets with a particular
gauging due to topological and geometric flux. Key to this reduction is several
modes which have not been considered before in the literature and our
construction allows us to easily show that the Papadopoulos - Tseytlin ansatz
for IIB solutions on T(1,1) is a consistent truncation. This explicit reduction
provides an organizing principle for the linearized spectrum around the warped
deformed conifold as well as the baryonic branch and should have applications
to the physics of flux compactifications with warped throats.Comment: 23 pages, v2 minor correction
Automating the POWHEG method in Sherpa

A new implementation of the POWHEG method into the Monte-Carlo event
generator Sherpa is presented, focusing on processes with a simple colour
structure. Results for a variety of processes, namely e+e- to hadrons,
deep-inelastic lepton-nucleon scattering, hadroproduction of single vector
bosons and of vector boson pairs as well as the production of Higgs bosons in
gluon fusion serve as test cases for the successful realisation. The algorithm
is fully automated such that for further processes only virtual matrix elements
need to be included.Comment: 33 pages; revised version accepted for publication in JHE
Analytical Studies on Holographic Superconductors in Gauss-Bonnet
  Gravity

We use the variational method for the Sturm-Liouville eigenvalue problem to
analytically calculate some properties of holographic superconductors with
Gauss-Bonnet gravity in probe limit. By studying the holographic p-wave and
s-wave superconductors in (3+1)-dimensional boundary field theories, it is
found that near the critical temperature, the critical exponent of the
condensation is 1/2 which is the universal value in mean-field theory. We also
find that when Gauss-Bonnet coefficients grow bigger the operators on the
boundary field theory will be harder to condense. These are in good agreement
with the numerical results.Comment: 16pp, no figures;Some minor changes and references adde