pinecone/core-2020-05-10-deduplication huggingface dataset:
Computing the temperature dependence of effective CP violation in the
  standard model

CP violation in the standard model originates from the
Cabibbo-Kobayashi-Maskawa mixing matrix. Upon integrating all fermions out of
the theory, its effects are captured by a series of effective nonrenormalizable
operators for the bosonic gauge and Higgs fields. We compute the CP-violating
part of the effective action to the leading nontrivial, sixth order in the
covariant gradient expansion as a function of temperature. In the limit of zero
temperature, our result addresses the discrepancy between two independent
calculations existing in the literature [1,2]. We find that CP violation in the
standard model is strongly suppressed at high temperature, but that at T<1GeV
it may be relevant for certain scenarios of baryogenesis. We also identify a
selected class of operators at the next, eighth order and discuss the
convergence of the covariant gradient expansion.Comment: 34 pages, 5 eps figures, jheppub style; v2: minor corrections,
  published versio
Cornering the unphysical vertex

In the classical pure spinor worldsheet theory of AdS5xS5 there are some
vertex operators which do not correspond to any physical excitations. We study
their flat space limit. We find that the BRST operator of the worldsheet theory
in flat space-time can be nontrivially deformed without deforming the
worldsheet action. Some of these deformations describe the linear dilaton
background. But the deformation corresponding to the nonphysical vertex differs
from the linear dilaton in not being worldsheet parity even. The nonphysically
deformed worldsheet theory has nonzero beta-function at one loop. This means
that the classical Type IIB SUGRA backgrounds are not completely characterized
by requiring the BRST symmetry of the classical worldsheet theory; it is also
necessary to require the vanishing of the one-loop beta-function.Comment: LaTeX 40pp; v2: explained the relation to the linear dilaton
  background (Section 6), changes in Introduction and Abstrac
Collective Excitations of Holographic Quantum Liquids in a Magnetic
  Field

We use holography to study N=4 supersymmetric SU(Nc) Yang-Mills theory in the
large-Nc and large-coupling limits coupled to a number Nf << Nc of
(n+1)-dimensional massless supersymmetric hypermultiplets in the Nc
representation of SU(Nc), with n=2,3. We introduce a temperature T, a baryon
number chemical potential mu, and a baryon number magnetic field B, and work in
a regime with mu >> T,\sqrt{B}. We study the collective excitations of these
holographic quantum liquids by computing the poles in the retarded Green's
function of the baryon number charge density operator and the associated peaks
in the spectral function. We focus on the evolution of the collective
excitations as we increase the frequency relative to T, i.e. the
hydrodynamic/collisionless crossover. We find that for all B, at low
frequencies the tallest peak in the spectral function is associated with
hydrodynamic charge diffusion. At high frequencies the tallest peak is
associated with a sound mode similar to the zero sound mode in the
collisionless regime of a Landau Fermi liquid. The sound mode has a gap
proportional to B, and as a result for intermediate frequencies and for B
sufficiently large compared to T the spectral function is strongly suppressed.
We find that the hydrodynamic/collisionless crossover occurs at a frequency
that is approximately B-independent.Comment: 45 pages, 8 png and 47 pdf images in 22 figure
Massive vector current correlator in thermal QCD

We present an NLO analysis of the massive vector current correlator at
temperatures above a few hundred MeV. The physics of this correlator originates
from a transport peak, related to heavy quark diffusion, and from the
quark-antiquark threshold, related to quarkonium physics. In the bottom case
both can be studied with separate effective theories, but for charm these may
not be accurate, so a study within the full theory is needed. Working in
imaginary time, the NLO correlator can be computed in unresummed perturbation
theory; comparing with lattice data, we find good agreement. Subsequently we
inspect how non-perturbative modifications of the transport peak would affect
the imaginary-time correlator. The massive NLO quark-number susceptibility is
also contrasted with numerical measurement.Comment: 28 pages. v2: references and clarifications added, published versio
Positivity, entanglement entropy, and minimal surfaces

The path integral representation for the Renyi entanglement entropies of
integer index n implies these information measures define operator correlation
functions in QFT. We analyze whether the limit $n\rightarrow 1$, corresponding
to the entanglement entropy, can also be represented in terms of a path
integral with insertions on the region's boundary, at first order in $n-1$.
This conjecture has been used in the literature in several occasions, and
specially in an attempt to prove the Ryu-Takayanagi holographic entanglement
entropy formula. We show it leads to conditional positivity of the entropy
correlation matrices, which is equivalent to an infinite series of polynomial
inequalities for the entropies in QFT or the areas of minimal surfaces
representing the entanglement entropy in the AdS-CFT context. We check these
inequalities in several examples. No counterexample is found in the few known
exact results for the entanglement entropy in QFT. The inequalities are also
remarkable satisfied for several classes of minimal surfaces but we find
counterexamples corresponding to more complicated geometries. We develop some
analytic tools to test the inequalities, and as a byproduct, we show that
positivity for the correlation functions is a local property when supplemented
with analyticity. We also review general aspects of positivity for large N
theories and Wilson loops in AdS-CFT.Comment: 36 pages, 10 figures. Changes in presentation and discussion of
  Wilson loops. Conclusions regarding entanglement entropy unchange
Spinor helicity structures in higher spin theories

It is shown that the coefficient of the cubic interaction vertex, in higher
spin Lagrangians, has a very simple form when written in terms of spinor
helicity products. The result for a higher-spin field, of spin $\lambda$, is
equal to the corresponding Yang-Mills coefficient raised to the power
$\lambda$. Among other things, this suggests perturbative ties, similar to the
KLT relations, between higher spin theories and pure Yang-Mills. This result is
obtained in four-dimensional flat spacetime.Comment: 5 pages. v2: minor changes, references adde
Surface Operators in N=2 4d Gauge Theories

N=2 four dimensional gauge theories admit interesting half BPS surface
operators preserving a (2,2) two dimensional SUSY algebra. Typical examples are
(2,2) 2d sigma models with a flavor symmetry which is coupled to the 4d gauge
fields. Interesting features of such 2d sigma models, such as (twisted) chiral
rings, and the tt* geometry, can be carried over to the surface operators, and
are affected in surprising ways by the coupling to 4d degrees of freedom. We
will describe in detail a relation between the parameter space of twisted
couplings of the surface operator and the Seiberg-Witten geometry of the bulk
theory. We will discuss a similar result about the tt* geometry of the surface
operator. We will predict the existence and general features of a wall-crossing
formula for BPS particles bound to the surface operator.Comment: 25 pages, 4 figure
A Simple Grand Unified Relation between Neutrino Mixing and Quark Mixing

It is proposed that all flavor mixing is caused by the mixing of the three
quark and lepton families with vectorlike fermions in 5 + 5-bar multiplets of
SU(5). This simple assumption implies that both V_{CKM} and U_{MNS} are
generated by a single matrix. The entire 3-by-3 complex mass matrix of the
neutrinos M_{nu} is then found to have a simple expression in terms of two
complex parameters and an overall scale. Thus, all the presently unknown
neutrino parameters are predicted. The best fits are for theta_{atm} less than
or approximately 40 degrees. The leptonic Dirac CP phase is found to be
somewhat greater than pi radians.Comment: 10 pages, 4 figures, one table. Typos correcte
Electroweak corrections to W-boson pair production at the LHC

Vector-boson pair production ranks among the most important Standard-Model
benchmark processes at the LHC, not only in view of on-going Higgs analyses.
These processes may also help to gain a deeper understanding of the electroweak
interaction in general, and to test the validity of the Standard Model at
highest energies. In this work, the first calculation of the full one-loop
electroweak corrections to on-shell W-boson pair production at hadron colliders
is presented. We discuss the impact of the corrections on the total cross
section as well as on relevant differential distributions. We observe that
corrections due to photon-induced channels can be amazingly large at energies
accessible at the LHC, while radiation of additional massive vector bosons does
not influence the results significantly.Comment: 29 pages, 15 figures, 4 tables; some references and comments on
  \gamma\gamma -> WW added; matches version published in JHE
Weak radiative corrections to dijet production at hadron colliders

We present the calculation of the most important electroweak corrections to
dijet production at the LHC and the Tevatron, comprising tree-level effects of
O(\alpha_s\alpha,\alpha^2) and weak loop corrections of O(\alpha_s^2\alpha).
Although negligible for integrated cross sections, these corrections can reach
10-20% in the TeV range for transverse jet momenta k_T. Our detailed discussion
of numerical results comprises distributions in the dijet invariant mass and in
the transverse momenta of the leading and subleading jets. We find that the
weak loop corrections amount to about -12% and -10% for leading jets with
k_T~3TeV at the 14TeV LHC and k_T~800GeV at the Tevatron, respectively. The
electroweak tree-level contributions are of the same generic size and typically
positive at the LHC and negative at the Tevatron at high energy scales.
Generally the corrections to the dijet invariant mass distributions are smaller
by at least a factor of two as compared to the corresponding reach in the k_T
distributions, because unlike the k_T spectra the invariant-mass distributions
are not dominated by the Sudakov regime at high energy scales.Comment: 37 pages, latex, 22 figure
The Wave Function of Quantum de Sitter

We consider quantum general relativity in three dimensions with a positive
cosmological constant. The Hartle-Hawking wave function is computed as a
function of metric data at asymptotic future infinity. The analytic
continuation from Euclidean Anti-de Sitter space provides a natural integration
contour in the space of metrics, allowing us -- with certain assumptions -- to
compute the wave function exactly, including both perturbative and
non-perturbative effects. The resulting wave function is a non-normalizable
function of the conformal structure of future infinity which is infinitely
peaked at geometries where I^+ becomes infinitely inhomogeneous. We interpret
this as a non-perturbative instability of de Sitter space in three dimensional
Einstein gravity.Comment: 20 pages, 3 figure
Probing Colored Particles with Photons, Leptons, and Jets

If pairs of new colored particles are produced at the Large Hadron Collider,
determining their quantum numbers, and even discovering them, can be
non-trivial. We suggest that valuable information can be obtained by measuring
the resonant signals of their near-threshold QCD bound states. If the particles
are charged, the resulting signatures include photons and leptons and are
sufficiently rich for unambiguously determining their various quantum numbers,
including the charge, color representation and spin, and obtaining a precise
mass measurement. These signals provide well-motivated benchmark models for
resonance searches in the dijet, photon+jet, diphoton and dilepton channels.
While these measurements require that the lifetime of the new particles be not
too short, the resulting limits, unlike those from direct searches for pair
production above threshold, do not depend on the particles' decay modes. These
limits may be competitive with more direct searches if the particles decay in
an obscure way.Comment: 39 pages, 9 figures; v2: more recent searches include
Non-AdS holography in 3-dimensional higher spin gravity - General recipe
  and example

We present the general algorithm to establish the classical and quantum
asymptotic symmetry algebra for non-AdS higher spin gravity and implement it
for the specific example of spin-3 gravity in the non-principal embedding with
Lobachevsky (H^2xR) boundary conditions. The asymptotic symmetry algebra for
this example consists of a quantum W_3^2 (Polyakov-Bershadsky) and an affine
u(1) algebra. We show that unitary representations of the quantum W_3^2 algebra
exist only for two values of its central charge, the trivial c=0 "theory" and
the simple c=1 theory.Comment: 23pp, v2: added Ref. [25], corrected typo in (5.4c
Periodic Arrays of M2-Branes

We consider periodic arrays of M2-branes in the ABJM model in the spirit of a
circle compactification to D2-branes in type IIA string theory. The result is a
curious formulation of three-dimensional maximally supersymmetric Yang-Mills
theory in terms of fermions, seven transverse scalars, a non-dynamical gauge
field and an additional scalar `dual gluon'. Upon further T-duality on a
transverse torus we obtain a non-manifest-Lorentz-invariant description of
five-dimensional maximally supersymmetric Yang-Mills. Here the additional
scalar field can be thought of as the components of a two-form along the torus.
This action can be viewed as an M-theory description of M5-branes on ${\mathbb
T}^3$.Comment: 20 pages, 1 figure, v3: typos corrected, published versio
Further Evidence for Lattice-Induced Scaling

We continue our study of holographic transport in the presence of a
background lattice. We recently found evidence that the presence of a lattice
induces a new intermediate scaling regime in asymptotically $AdS_4$ spacetimes.
This manifests itself in the optical conductivity which exhibits a robust
power-law dependence on frequency, $\sigma \sim \omega^{-2/3}$, in a
"mid-infrared" regime, a result which is in striking agreement with experiments
on the cuprates. Here we provide further evidence for the existence of this
intermediate scaling regime. We demonstrate similar scaling in the
thermoelectric conductivity, find analogous scalings in asymptotically $AdS_5$
spacetimes, and show that we get the same results with an ionic lattice.Comment: 19 pages, 12 figure
Axion-Higgs Unification

In theories with no fundamental scalars, one gauge group can become strong at
a large scale Lambda and spontaneously break a global symmetry, producing the
Higgs and the axion as composite pseudo-Nambu-Goldstone bosons. We show how
KSVZ and DFSZ axion models can be naturally realised. The assumption Lambda
around 10^{11} GeV is phenomenologically favoured because: a) The axion solves
the QCD theta problem and provides the observed DM abundance; b) The observed
Higgs mass is generated via RGE effects from a small Higgs quartic coupling at
the compositeness scale, provided that the Higgs mass term is fine-tuned to be
of electroweak size; c) Lepton, quark as well as neutrino masses can be
obtained from four-fermion operators at the compositeness scale. d) The extra
fermions can unify the gauge couplings.Comment: 19 pages. Refs. added and eq. 3.6 fixe
Quantum Black Holes from Cosmic Rays

We investigate the possibility for cosmic ray experiments to discover
non-thermal small black holes with masses in the TeV range. Such black holes
would result due to the impact between ultra high energy cosmic rays or
neutrinos with nuclei from the upper atmosphere and decay instantaneously. They
could be produced copiously if the Planck scale is in the few TeV region. As
their masses are close to the Planck scale, these holes would typically decay
into two particles emitted back-to-back. Depending on the angles between the
emitted particles with respect to the center of mass direction of motion, it is
possible for the simultaneous showers to be measured by the detectors.Comment: 6 pages, 3 figure
Constrained SUSY seesaws with a 125 GeV Higgs

Motivated by the ATLAS and CMS discovery of a Higgs-like boson with a mass around 125 GeV, and by the need of explaining neutrino masses, we analyse the three canonical SUSY versions of the seesaw mechanism (type I, II and III) with CMSSM boundary conditions. In type II and III cases, SUSY particles are lighter than in the CMSSM (or the constrained type I seesaw), for the same set of input parameters at the universality scale. Thus, to explain m(h0) similar or equal to 125 GeV at low energies, one is forced into regions of parameter space with very large values of m(0), M-1/2 or A(0). We compare the squark and gluino masses allowed by the ATLAS and CMS ranges for m(h0) (extracted from the 2011-2012 data), and discuss the possibility of distinguishing seesaw models in view of future results on SUSY searches. In particular, we briefly comment on the discovery potential of LHC upgrades, for squark/gluino mass ranges required by present Higgs mass constraints. A discrimination between different seesaw models cannot rely on the Higgs mass data alone, therefore we also take into account the MEG upper limit on BR(mu -> e gamma) and show that, in some cases, this may help to restrict the SUSY parameter space, as well as to set complementary limits on the seesaw scale
Vacuum Stability, Perturbativity, EWPD and Higgs-to-diphoton rate in
  Type II Seesaw Models

We study constraints from perturbativity and vacuum stability as well as the
EWPD in the type II seesaw model. As a result, we can put stringent limits on
the Higgs triplet couplings depending on the cut-off scale. The EWPD tightly
constrain the Higgs triplet mass splitting to be smaller than 40 GeV. Analyzing
the Higgs-to-diphoton rate in the allowed parameter region, we show a possible
enhancement by up to 100 % and 50 % for the cut-off scale of 100 TeV and
$10^{19}$ GeV, respectively, if the doubly charged Higgs boson mass is as low
as 100 GeV.Comment: Figs modified, reference added, matches with published versio
Chern-Simons diffusion rate in a holographic Yang-Mills theory

Using holography, we compute the Chern-Simons diffusion rate of 4d gauge
theories constructed by wrapping D4-branes on a circle. In the model with
antiperiodic boundary conditions for fermions, we find that it scales like
$T^6$ in the high-temperature phase. With periodic fermions, this scaling
persists at low temperatures. The scaling is reminiscent of 6d hydrodynamic
behavior even at temperatures small compared to compactification scales of the
M5-branes from which the D4-branes descend. We offer a holographic explanation
of this behavior by adding a new entry to the known map between D4 and M5
hydrodynamics, and suggest a field theory explanation based on "deconstruction"
or "fractionization".Comment: 13 pages, misstatement in published version about low temperature
  phase removed, main results unaffecte
Extended phase space thermodynamics for charged and rotating black holes
  and Born-Infeld vacuum polarization

We investigate the critical behaviour of charged and rotating AdS black holes
in d spacetime dimensions, including effects from non-linear electrodynamics
via the Born-Infeld action, in an extended phase space in which the
cosmological constant is interpreted as thermodynamic pressure. For
Reissner-Nordstrom black holes we find that the analogy with the Van der Walls
liquid-gas system holds in any dimension greater than three, and that the
critical exponents coincide with those of the Van der Waals system. We find
that neutral slowly rotating black holes in four space-time dimensions also
have the same qualitative behaviour. However charged and rotating black holes
in three spacetime dimensions do not exhibit critical phenomena. For
Born-Infeld black holes we define a new thermodynamic quantity B conjugate to
the Born-Infeld parameter b that we call Born-Infeld vacuum polarization. We
demonstrate that this quantity is required for consistency of both the first
law of thermodynamics and the corresponding Smarr relation.Comment: 23 pages, 32 figures, v2: minor changes, upgraded reference
ABCD of Beta Ensembles and Topological Strings

We study beta-ensembles with Bn, Cn, and Dn eigenvalue measure and their
relation with refined topological strings. Our results generalize the familiar
connections between local topological strings and matrix models leading to An
measure, and illustrate that all those classical eigenvalue ensembles, and
their topological string counterparts, are related one to another via various
deformations and specializations, quantum shifts and discrete quotients. We
review the solution of the Gaussian models via Macdonald identities, and
interpret them as conifold theories. The interpolation between the various
models is plainly apparent in this case. For general polynomial potential, we
calculate the partition function in the multi-cut phase in a perturbative
fashion, beyond tree-level in the large-N limit. The relation to refined
topological string orientifolds on the corresponding local geometry is
discussed along the way.Comment: 33 pages, 1 figur
Non-Equilibrium Field Dynamics of an Honest Holographic Superconductor

Most holographic models of superconducting systems neglect the effects of
dynamical boundary gauge fields during the process of spontaneous
symmetry-breaking. Usually a global symmetry gets broken. This yields a
superfluid, which then is gauged "weakly" afterwards. In this work we build
(and probe the dynamics of) a holographic model in which a local boundary
symmetry is spontaneously broken instead. We compute two-point functions of
dynamical non-Abelian gauge fields in the normal and in the broken phase, and
find non-trivial gapless modes. Our AdS3 gravity dual realizes a p-wave
superconductor in (1+1) dimensions. The ground state of this model also breaks
(1+1)-dimensional parity spontaneously, while the Hamiltonian is
parity-invariant. We discuss possible implications of our results for a wider
class of holographic liquids.Comment: 32 pages, 12 figures; v3: string theory derivation of setup added
  (section 3.1), improved presentation, version accepted by JHEP; v2: paragraph
  added to discussion, figure added, references added, typos correcte
Testing new physics with the electron g-2

We argue that the anomalous magnetic moment of the electron (a_e) can be used
to probe new physics. We show that the present bound on new-physics
contributions to a_e is 8*10^-13, but the sensitivity can be improved by about
an order of magnitude with new measurements of a_e and more refined
determinations of alpha in atomic-physics experiments. Tests on new-physics
effects in a_e can play a crucial role in the interpretation of the observed
discrepancy in the anomalous magnetic moment of the muon (a_mu). In a large
class of models, new contributions to magnetic moments scale with the square of
lepton masses and thus the anomaly in a_mu suggests a new-physics effect in a_e
of (0.7 +- 0.2)*10^-13. We also present examples of new-physics theories in
which this scaling is violated and larger effects in a_e are expected. In such
models the value of a_e is correlated with specific predictions for processes
with violation of lepton number or lepton universality, and with the electric
dipole moment of the electron.Comment: 34 pages, 7 figures. Minor changes and references adde