pinecone/core-2020-05-10-deduplication huggingface dataset:
Thermoelectric DC conductivities and Stokes flows on black hole horizons.

We consider a general class of electrically charged black holes of Einstein-Maxwell-scalar theory that are holographically dual to conformal field theories at finite charge density which break translation invariance explicitly. We examine the linearised perturbations about the solutions that are associated with the thermoelectric DC conductivity. We show that there is a decoupled sector at the black hole horizon which must solve generalised Stokes equations for a charged fluid. By solving these equations we can obtain the DC conductivity of the dual field theory. For Q-lattices and one-dimensional lattices we solve the fluid equations to obtain closed form expressions for the DC conductivity in terms of the solution at the black hole horizon. We also determine the leading order DC conductivity for lattices that can be expanded as a perturbative series about translationally invariant solutions
Scaling symmetry and scalar hairy Lifshitz black holes

By utilizing the scaling symmetry of the reduced action for planar black
holes, we obtain the corresponding conserved charge. We use the conserved
charge to find the generalized Smarr relation of static hairy planar black
holes in various dimensions. Our results not only reproduce the relation in the
various known cases but also give the new relation in the Lifshitz planar black
holes with the scalar hair.Comment: 1+22 pages, plain LaTex; v2: minor improvements, fixed typos; v3
  version to appear in JHE
Non-uniform black strings and the critical dimension in the $1/D$
  expansion

Non-uniform black strings (NUBS) are studied by the large $D$ effective
theory approach. By solving the near-horizon geometry in the $1/D$ expansion,
we obtain the effective equation for the deformed horizon up to the
next-to-next-to-leading order (NNLO) in $1/D$. We also solve the far-zone
geometry by the Newtonian approximation. Matching the near and far zones, the
thermodynamic variables are computed in the $1/D$ expansion. As the result, the
large $D$ analysis gives a critical dimension $D_*\simeq13.5$ at which the
translation-symmetry-breaking phase transition changes between first and second
order. This value of $D_*$ agrees perfectly, within the precision of the $1/D$
expansion, with the result previously obtained by E. Sorkin through the
numerical resolution. We also compare our NNLO results for the thermodynamics
of NUBS to earlier numerical calculations, and find good agreement within the
expected precision.Comment: 33 pages, 8 figures, Ancillary Mathematica notebook contains details
  of NNLO results; v2: Published versio
Constraint algebra of general relativity from a formal continuum limit of canonical tensor model

Canonical tensor model (CTM for short below) is a rank-three tensor model formulated as a totally constrained system in the canonical formalism. In the classical case, the constraints form a first-class constraint Poisson algebra with structures similar to that of the ADM formalism of general relativity, qualifying CTM as a possible discrete formalism for quantum gravity. In this paper, we show that, in a formal continuum limit, the constraint Poisson algebra of CTM with no cosmological constant exactly reproduces that of the ADM formalism. To this end, we obtain the expression of the metric tensor field in general relativity in terms of one of the dynamical rank-three tensors in CTM, and determine the correspondence between the constraints of CTM and those of the ADM formalism. On the other hand, the cosmological constant term of CTM seems to induce non-local dynamics, and is inconsistent with an assumption about locality of the continuum limit
Incoherent transport in clean quantum critical metals

In a clean quantum critical metal, and in the absence of umklapp, most d.c.
conductivities are formally infinite due to momentum conservation. However,
there is a particular combination of the charge and heat currents which has a
finite, universal conductivity. In this paper, we describe the physics of this
conductivity $\sigma_Q$ in quantum critical metals obtained by charge doping a
strongly interacting conformal field theory. We show that it satisfies an
Einstein relation and controls the diffusivity of a conserved charge in the
metal. We compute $\sigma_Q$ in a class of theories with holographic
gravitational duals. Finally, we show how the temperature scaling of $\sigma_Q$
depends on certain critical exponents characterizing the quantum critical
metal. The holographic results are found to be reproduced by the scaling
analysis, with the charge density operator becoming marginal in the emergent
low energy quantum critical theory.Comment: v1: 1 + 16 pages + reference
Lepton fluxes from atmospheric charm revisited

We update predictions for lepton fluxes from the hadroproduction of charm
quarks in the scattering of primary cosmic rays with the Earth's atmosphere.
The calculation of charm-pair hadroproduction applies the latest results from
perturbative QCD through next-to-next-to-leading order and modern parton
distributions, together with estimates on various sources of uncertainties. Our
predictions for the lepton fluxes turn out to be compatible, within the
uncertainty band, with recent results in the literature. However, by taking
into account contributions neglected in previous works, our total uncertainties
are much larger. The predictions are crucial for the interpretation of results
from neutrino experiments like IceCube, when disentangling signals of neutrinos
of astrophysical origin from the atmospheric background.Comment: 40 pages, 24 figure
Heavy Higgs bosons and the 2 TeV $W'$ boson

The hints from the LHC for the existence of a $W'$ boson of mass around 1.9
TeV point towards a certain $SU(2)_L\times SU(2)_R\times U(1)_{B-L}$ gauge
theory with an extended Higgs sector. We show that the decays of the $W'$ boson
into heavy Higgs bosons have sizable branching fractions. Interpreting the
ATLAS excess events in the search for same-sign lepton pairs plus $b$ jets as
arising from $W'$ cascade decays, we estimate that the masses of the heavy
Higgs bosons are in the 400--700 GeV range.Comment: 22 pages; v2: Eqs. 3.6 and 3.8 corrected, clarifications and
  references adde
Supersymmetric AdS_7 backgrounds in half-maximal supergravity and
  marginal operators of (1,0) SCFTs

We determine the supersymmetric AdS_7 backgrounds of seven-dimensional
half-maximal gauged supergravities and show that they do not admit any
deformations that preserve all 16 supercharges. We compare this result to the
conformal manifold of the holographically dual (1,0) superconformal field
theories and show that accordingly its representation theory implies that no
supersymmetric marginal operators exist.Comment: 20 pages, corrected classification of non-semisimple gauge groups,
  version to appear in JHE
NLO QCD corrections to the resonant Vector Diquark production at the LHC

With the upcoming run of the Large Hadron Collider (LHC) at much higher
center of mass energies, the search for Beyond Standard Model (BSM) physics
will again take center stage. New colored particles predicted in many BSM
scenarios are expected to be produced with large cross sections thus making
them interesting prospects as a doorway to hints of new physics. We consider
the resonant production of such a colored particle, the diquark, a particle
having the quantum number of two quarks. The diquark can be either a scalar or
vector. We focus on the vector diquark which has much larger production cross
section compared to the scalar ones. In this work we calculate the
next-to-leading order (NLO) QCD corrections to the on-shell vector diquark
production at the LHC produced through the fusion of two quarks as well as the
NLO corrections to its decay width. We present full analytic results for the
one-loop NLO calculation and do a numerical study to show that the NLO
corrections can reduce the scale uncertainties in the cross sections which can
be appreciable and therefore modify the expected search limits for such
particles. We also use the dijet result from LHC to obtain current limits on
the mass and coupling strengths of the vector diquarks.Comment: Published in JHE
Dark matter scenarios in a constrained model with Dirac gauginos

We perform the first analysis of Dark Matter scenarios in a constrained model
with Dirac Gauginos. The model under investigation is the Constrained Minimal
Dirac Gaugino Supersymmetric Standard model (CMDGSSM) where the Majorana mass
terms of gauginos vanish. However, $R$-symmetry is broken in the Higgs sector
by an explicit and/or effective $B_\mu$-term. This causes a mass splitting
between Dirac states in the fermion sector and the neutralinos, which provide
the dark matter candidate, become pseudo-Dirac states. We discuss two
scenarios: the universal case with all scalar masses unified at the GUT scale,
and the case with non-universal Higgs soft-terms. We identify different regions
in the parameter space which fullfil all constraints from the dark matter
abundance, the limits from SUSY and direct dark matter searches and the Higgs
mass. Most of these points can be tested with the next generation of direct
dark matter detection experiments.Comment: 28 pages, 11 figures; v2: minor changes, title modified; matches
  published versio
Bubble Expansion and the Viability of Singlet-Driven Electroweak
  Baryogenesis

The standard picture of electroweak baryogenesis requires slowly expanding
bubbles. This can be difficult to achieve if the vacuum expectation value of a
gauge singlet scalar field changes appreciably during the electroweak phase
transition. It is important to determine the bubble wall velocity in this case,
since the predicted baryon asymmetry can depend sensitively on its value. Here,
this calculation is discussed and illustrated in the real singlet extension of
the Standard Model. The friction on the bubble wall is computed using a kinetic
theory approach and including hydrodynamic effects. Wall velocities are found
to be rather large ($v_w \gtrsim 0.2$) but compatible with electroweak
baryogenesis in some portions of the parameter space. If the phase transition
is strong enough, however, a subsonic solution may not exist, precluding
non-local electroweak baryogenesis altogether. The results presented here can
be used in calculating the baryon asymmetry in various singlet-driven
scenarios, as well as other features related to cosmological phase transitions
in the early Universe, such as the resulting spectrum of gravitational
radiation.Comment: v2: matches version published in JHE
Probing CPT in transitions with entangled neutral kaons

In this paper we present a novel CPT symmetry test in the neutral kaon system based, for the first time, on the direct comparison of the probabilities of a transition and its CPT reverse. The required interchange of in out states for a given process is obtained exploiting the Einstein-Podolsky-Rosen correlations of neutral kaon pairs produced at a phi-factory. The observable quantities have been constructed by selecting the two semileptonic decays for flavour tag, the pi and 3 pi(0) decays for CP tag and the time orderings of the decay pairs. The interpretation in terms of the standard Weisskopf-Wigner approach to this system, directly connects CPT violation in these observables to the violating R delta parameter in the mass matrix of K-0 (K) over bar (0), a genuine CPT violating effect independent of Delta Gamma and not requiring the decay as an essential ingredient. Possible spurious effects induced by CP violation in the decay and/or a violation of the Delta S = Delta Q rule have been shown to be well under control. The proposed test is thus fully robust, and might shed light on possible new CPT violating mechanisms, or further improve the precision of the present experimental limits. It could be implemented at the DA Phi NE facility in Frascati, where the KLOE-2 experiment might reach a statistical sensitivity of O (10(-3)) on the newly proposed observable quantities
A profusion of $1/2$ BPS Wilson loops in $\mathcal{N}=4$
  Chern-Simons-matter theories

We initiate the study of $1/2$ BPS Wilson loops in $\mathcal{N}=4$
Chern-Simons-matter theories in three dimensions. We consider a circular or
linear quiver with Chern-Simons levels $k$, $-k$ and $0$, and focus on loops
preserving one of the two $SU(2)$ subgroups of the $R$-symmetry. In the cases
with no vanishing Chern-Simons levels, we find a pair of Wilson loops for each
pair of adjacent nodes on the quiver connected by a hypermultiplet (nodes
connected by twisted hypermultiplets have Wilson loops preserving another set
of supercharges). We expect this classical pairwise degeneracy to be lifted by
quantum corrections. In the case with nodes with vanishing Chern-Simons terms
connected by twisted hypermultiplets, we find that the usual $1/4$ BPS Wilson
loops are automatically enlarged to $1/2$ BPS, as happens also in 3-dimensional
Yang-Mills theory. When the nodes with vanishing Chern-Simons levels are
connected by untwisted hypermultiplets, we do not find any Wilson loops
coupling to those nodes which are classically invariant. Rather, we find
several loops whose supersymmetry variation, while non zero, vanishes in any
correlation function, so is weakly zero. We expect only one linear combination
of those Wilson loops to remain BPS when quantum corrections are included. We
analyze the M-theory duals of those Wilson loops and comment on their
degeneracy. We also show that these Wilson loops are cohomologically equivalent
to certain $1/4$ BPS Wilson loops whose expectation value can be evaluated by
the appropriate localized matrix model.Comment: 40 page
Supersymmetric Backgrounds and Black Holes in ${\cal N}=(1,1)$
  Cosmological New Massive Supergravity

Using an off-shell Killing spinor analysis we perform a systematic
investigation of the supersymmetric background and black hole solutions of the
${\cal N}=(1,1)$ Cosmological New Massive Gravity model. The solutions with a
null Killing vector are the same pp-wave solutions that one finds in the ${\cal
N}=1$ model but we find new solutions with a time-like Killing vector that are
absent in the ${\cal N}=1$ case. An example of such a solution is a Lifshitz
spacetime. We also consider the supersymmetry properties of the so-called
rotating hairy BTZ black holes and logarithmic black holes in an $AdS_3$
background. Furthermore, we show that under certain assumptions there is no
supersymmetric Lifshitz black hole solution.Comment: 27 pages, v2: Typos Corrected, Version appeared in JHE
Dispersion-theoretical analysis of the D^+ --> K^- pi^+ pi^+ Dalitz plot

We study the Dalitz plot of the Cabibbo-favored charmed-meson decay $D^+\to
K^-\pi^+\pi^+$ using dispersion theory. The formalism respects all constraints
from analyticity and unitarity, and consistently describes final-state
interactions between all three decay products. We employ pion-pion and
pion-kaon phase shifts as input, and fit the pertinent subtraction constants to
Dalitz plot data by the CLEO and FOCUS collaborations. Phase motions of
resonant as well as nonresonant amplitudes are discussed, which should provide
crucial input for future studies of CP violation in similar three-body charm
decays.Comment: 32 pages, 7 figures, version published in JHE
Heavy charged Higgs boson production at the LHC

In this paper we study the production of a heavy charged Higgs boson in association with heavy quarks at the LHC in the two-Higgs-doublet model. We present for the first time fully-differential results obtained in the four-flavour scheme at NLO accuracy, both at fixed order and including the matching with parton showers. Relevant differential distributions are studied for two values of the charged boson mass and a thorough comparison is performed between predictions obtained in the four- and five-flavour schemes. We show that the agreement between the two schemes is improved by NLO(+PS) corrections for observables inclusive in the degrees of freedom of bottom quarks. We argue that the four-flavour scheme leads to more reliable predictions, thanks to its accurate description of the bottom-quark kinematics and its small dependence on the Monte Carlos, which in turn is rather large in the five-flavour scheme. A detailed set of recommendations for the simulation of this process in experimental analyses at the LHC is provided
Comments on universal properties of entanglement entropy and bulk
  reconstruction

Entanglement entropy of holographic CFTs is expected to play a crucial role
in the reconstruction of semiclassical bulk gravity. We consider the
entanglement entropy of spherical regions of vacuum, which is known to contain
universal contributions. After perturbing the CFT with a relevant scalar
operator, also the first order change of this quantity gives a universal term
which only depends on a discrete set of basic CFT parameters. We show that in
gravity this statement corresponds to the uniqueness of the ghost-free graviton
propagator on an AdS background geometry. While the gravitational dynamics in
this context contains little information about the structure of the bulk
theory, there is a discrete set of dimensionless parameters of the theory which
determines the entanglement entropy. We argue that for every (not necessarily
holographic) CFT, any reasonable gravity model can be used to compute this
particular entanglement entropy. We elucidate how this statement is consistent
with AdS/CFT and also give various generalizations. On the one hand this
illustrates the remarkable usefulness of geometric concepts for understanding
entanglement in general CFTs. On the other hand, it provides hints as to what
entanglement data can be expected to provide enough information to distinguish,
e.g., bulk theories with different higher curvature couplings.Comment: 37 pages; v2: added references; v3: minor clarifications and added
  references (published version
On Supersymmetric Lifshitz Field Theories

We consider field theories that exhibit a supersymmetric Lifshitz scaling
with two real supercharges. The theories can be formulated in the language of
stochastic quantization. We construct the free field supersymmetry algebra with
rotation singlet fermions for an even dynamical exponent $z=2k$ in an arbitrary
dimension. We analyze the classical and quantum $z=2$ supersymmetric
interactions in $2+1$ and $3+1$ spacetime dimensions and reveal a supersymmetry
preserving quantum diagrammatic cancellation. Stochastic quantization indicates
that Lifshitz scale invariance is broken in the $(3+1)$-dimensional quantum
theory.Comment: 26 page
Absence of Power-Law Mid-Infrared Conductivity in Gravitational Crystals

We compute conductivities of strongly-interacting and non-uniform charge
densities dual to inhomogeneous anti-de Sitter--black hole spacetimes.
Backreacting bulk scalars with periodic boundary profiles, we construct
generalizations of Reissner-Nordstr\"om-AdS that interpolate between those used
in two previous studies --- one that reports power-law scaling for the boundary
optical conductivity and one that does not. We find no evidence for power-law
scaling of the conductivity, thereby corroborating the previous negative result
that gravitational crystals are insufficient to generate the power-law
mid-infrared conductivity observed in cuprate superconductors.Comment: 9 pages, 4 figures, 7 image
Conformal Standard Model with an extended scalar sector

We present an extended version of the Conformal Standard Model (characterized
by the absence of any new intermediate scales between the electroweak scale and
the Planck scale) with an enlarged scalar sector coupling to right-chiral
neutrinos. The scalar potential and the Yukawa couplings involving only
right-chiral neutrinos are invariant under a new global symmetry SU(3)$_N$ that
complements the standard U(1)$_{B-L}$ symmetry, and is broken explicitly only
by the Yukawa interaction, of order $10^{-6}$, coupling right-chiral neutrinos
and the electroweak lepton doublets. We point out four main advantages of this
enlargement, namely: (1) the economy of the (non-supersymmetric) Standard
Model, and thus its observational success, is preserved; (2) thanks to the
enlarged scalar sector the RG improved one-loop effective potential is
everywhere positive with a stable global minimum, thereby avoiding the
notorious instability of the Standard Model vacuum; (3) the pseudo-Goldstone
bosons resulting from spontaneous breaking of the SU(3)$_N$ symmetry are
natural Dark Matter candidates with calculable small masses and couplings; and
(4) the Majorana Yukawa coupling matrix acquires a form naturally adapted to
leptogenesis. The model is made perturbatively consistent up to the Planck
scale by imposing the vanishing of quadratic divergences at the Planck scale
(`softly broken conformal symmetry'). Observable consequences of the model
occur mainly via the mixing of the new scalars and the standard model Higgs
boson.Comment: version accepted for publication in the JHEP, 41 pages, 1 figur
Unitarity, Crossing Symmetry and Duality in the scattering of ${\cal
  N}=1$ Susy Matter Chern-Simons theories

We study the most general renormalizable ${\cal N}=1$ $U(N)$ Chern-Simons
gauge theory coupled to a single (generically massive) fundamental matter
multiplet. At leading order in the 't Hooft large $N$ limit we present
computations and conjectures for the $2 \times 2$ $S$ matrix in these theories;
our results apply at all orders in the 't Hooft coupling and the matter self
interaction. Our $S$ matrices are in perfect agreement with the recently
conjectured strong weak coupling self duality of this class of theories. The
consistency of our results with unitarity requires a modification of the usual
rules of crossing symmetry in precisely the manner anticipated in
arXiv:1404.6373, lending substantial support to the conjectures of that paper.
In a certain range of coupling constants our $S$ matrices have a pole whose
mass vanishes on a self dual codimension one surface in the space of couplings.Comment: 63 pages + 26 pages appendices, 6 figures, V2: Corrected typos, added
  references, V3: Corrected typos, added clarification
Polarization of top quark as a probe of its chromomagnetic and
  chromoelectric couplings in $tW$ production at the Large Hadron Collider

We study the sensitivity of the Large Hadron Collider (LHC) to top quark
chromomagnetic (CMDM) and chromoelectric (CEDM) dipole moments and $Wtb$
effective couplings in single-top production in association with a $W^-$ boson,
followed by semileptonic decay of the top. The $Wt$ single-top production mode
helps to isolate the anomalous $ttg$ and $Wtb$ couplings, in contrast to
top-pair production and other single-top production modes, where other
new-physics effects can also contribute. We calculate the top polarization and
the effects of these anomalous couplings on it at two centre-of-mass (cm)
energies, 8 TeV and 14 TeV. As a measure of top polarization, we look at
decay-lepton angular distributions in the laboratory frame, without requiring
reconstruction of the rest frame of the top, and study the effect of the
anomalous couplings on these distributions. We construct certain asymmetries to
study the sensitivity of these distributions to top-quark couplings. We
determine individual limits on the dominant couplings, viz., the real part of
the CMDM $\mathrm{Re}\rho_2$, the imaginary part of the CEDM
$\mathrm{Im}\rho_3$, and the real part of the tensor $Wtb$ coupling
$\mathrm{Ref_{2R}}$, which may be obtained by utilizing these asymmetries at
the LHC. We also obtain simultaneous limits on pairs of these couplings taking
two couplings to be non-zero at a time.Comment: 25 pages, 13 figures, 2 tables. Matches the Published Version. arXiv
  admin note: text overlap with arXiv:1211.4075, arXiv:1107.259