pinecone/core-2020-05-10-deduplication huggingface dataset:
The Effective Field Theory of nonsingular cosmology

In this paper, we explore the nonsingular cosmology within the framework of
the Effective Field Theory(EFT) of cosmological perturbations. Due to the
recently proved no-go theorem, any nonsingular cosmological models based on the
cubic Galileon suffer from pathologies. We show how the EFT could help us
clarify the origin of the no-go theorem, and offer us solutions to break the
no-go. Particularly, we point out that the gradient instability can be removed
by using some spatial derivative operators in EFT. Based on the EFT
description, we obtain a realistic healthy nonsingular cosmological model, and
show the perturbation spectrum can be consistent with the observations.Comment: 21 pages, 2 figures, published in JHE
Kinematic Space and Wormholes

The kinematic space could play a key role in constructing the bulk geometry
from dual CFT. In this paper, we study the kinematic space from geometric
points of view, without resorting to differential entropy. We find that the
kinematic space could be intrinsically defined in the embedding space. For each
oriented geodesic in the Poincar\'e disk, there is a corresponding point in the
kinematic space. This point is the tip of the causal diamond of the disk whose
intersection with the Poincar\'e disk determines the geodesic. In this
geometric construction, the causal structure in the kinematic space can be seen
clearly. Moreover, we find that every transformation in the $SL(2,\mathbb{R})$
leads to a geodesic in the kinematic space. In particular, for a hyperbolic
transformation defining a BTZ black hole, it is a timelike geodesic in the
kinematic space. We show that the horizon length of the static BTZ black hole
could be computed by the geodesic length of corresponding points in the
kinematic space. Furthermore, we discuss the fundamental regions in the
kinematic space for the BTZ blackhole and multi-boundary wormholes.Comment: 31 pages, 20 figures, published versio
Equivalence of several descriptions for 6d SCFT

We show that the three different looking BPS partition functions, namely the
elliptic genus of the 6d $\mathcal{N}=(1,0)$ $Sp(1)$ gauge theory with $10$
flavors and a tensor multiplet, the Nekrasov partition function of the 5d
$\mathcal{N}=1$ $Sp(2)$ gauge theory with $10$ flavors, and the Nekrasov
partition function of the 5d $\mathcal{N}=1$ $SU(3)$ gauge theory with $10$
flavors, are all equal to each other under specific maps among gauge theory
parameters. This result strongly suggests that the three gauge theories have an
identical UV fixed point. Type IIB 5-brane web diagrams play an essential role
to compute the $SU(3)$ Nekrasov partition function as well as establishing the
maps.Comment: v1: 40 pages, 13 figures, v2: published versio
Di-boson signatures as Standard Candles for Partial Compositeness

Composite Higgs Models are often constructed including fermionic top partners
with a mass around the TeV scale, with the top partners playing the role of
stabilizing the Higgs potential and enforcing partial compositeness for the top
quark. A class of models of this kind can be formulated in terms of fermionic
strongly coupled gauge theories. A common feature they all share is the
presence of specific additional scalar resonances, namely two neutral singlets
and a colored octet, described by a simple effective Lagrangian. We study the
phenomenology of these scalars, both in a model independent and model dependent
way, including the bounds from all the available searches in the relevant
channels with di-boson and di-top final states. We develop a generic framework
which can be used to constrain any model containing pseudo-scalar singlets or
octets. Using it, we find that such signatures provide strong bounds on the
compositeness scale complementary to the traditional EWPT and Higgs couplings
deviations. In many cases a relatively light scalar can be on the verge of
discovery as a first sign of new physics.Comment: 75 pages, 16 figures; version matches the published article. v3: Sign
  of C_t in Appendix C in Eqs. (C1, C7, C9) corrected. Analysis, results and
  conclusions of the main article are unchange
The photo-philic QCD axion

We propose a framework in which the QCD axion has an exponentially large
coupling to photons, relying on the "clockwork" mechanism. We discuss the
impact of present and future axion experiments on the parameter space of the
model. In addition to the axion, the model predicts a large number of
pseudo-scalars which can be light and observable at the LHC. In the most
favorable scenario, axion Dark Matter will give a signal in multiple axion
detection experiments and the pseudo-scalars will be discovered at the LHC,
allowing to determine most of the parameters of the model.Comment: 22 pages, 5 figures. Experimental signature from CASPEr-wind adde
Flaxion: a minimal extension to solve puzzles in the standard model

We propose a minimal extension of the standard model which includes only one
additional complex scalar field, flavon, with flavor-dependent global U(1)
symmetry. It not only explains the hierarchical flavor structure in the quark
and lepton sector (including neutrino sector), but also solves the strong CP
problem by identifying the CP-odd component of the flavon as the QCD axion,
which we call flaxion. Furthermore, the flaxion model solves the cosmological
puzzles in the standard model, i.e., origin of dark matter, baryon asymmetry of
the universe, and inflation. We show that the radial component of the flavon
can play the role of inflaton without isocurvature nor domain wall problems.
The dark matter abundance can be explained by the flaxion coherent oscillation,
while the baryon asymmetry of the universe is generated through leptogenesis.Comment: 23 pages, 1 figure; v2: version published in JHE
Compactifications of 5d SCFTs with a twist

We study the compactification of 5d SCFTs to 4d on a circle with a twist in a
discrete global symmetry element of these SCFTs. We present evidence that this
leads to various 4d N=2 isolated SCFTs. These include many known theories as
well as seemingly new ones. The known theories include the recently discovered
rank 1 SU(4) SCFT and its mass deformations. One application of the new SCFTs
is in the dual descriptions of the 4d gauge theory SU(N)+1S+(N-2)F. Also
interesting is the appearance of a theory with rank 1 and $F_4$ global
symmetry.Comment: 59 pages, 47 figures; v2 references added; v3 references added +
  minor revisions, version published in JHE
A Quantum Check of AdS/dCFT

We build the framework for performing loop computations in the defect version
of N=4 super Yang-Mills theory which is dual to the probe D5-D3 brane system
with background gauge-field flux. In this dCFT, a codimension-one defect
separates two regions of space-time with different ranks of the gauge group and
three of the scalar fields acquire non-vanishing and space-time-dependent
vacuum expectation values. The latter leads to a highly non-trivial mass mixing
problem between different colour and flavour components, which we solve using
fuzzy-sphere coordinates. Furthermore, the resulting space-time dependence of
the theory's Minkowski space propagators is handled by reformulating these as
propagators in an effective AdS4. Subsequently, we initiate the computation of
quantum corrections. The one-loop correction to the one-point function of any
local gauge-invariant scalar operator is shown to receive contributions from
only two Feynman diagrams. We regulate these diagrams using dimensional
reduction, finding that one of the two diagrams vanishes, and discuss the
procedure for calculating the one-point function of a generic operator from the
SU(2) subsector. Finally, we explicitly evaluate the one-loop correction to the
one-point function of the BPS vacuum state, finding perfect agreement with an
earlier string-theory prediction. This constitutes a highly non-trivial test of
the gauge-gravity duality in a situation where both supersymmetry and conformal
symmetry are partially broken.Comment: 41 pages; v2: typos corrected, one comment added, matches published
  versio
Probing the scotogenic FIMP at the LHC

We analyse the signatures at the Large Hadron Collider (LHC) of the
scotogenic model, when the lightest Z2-odd particle is a singlet fermion and a
feebly interacting massive particle (FIMP). We further assume that the singlet
fermion constitutes the dark matter and that it is produced in the early
Universe via the freeze-in mechanism. The small couplings required to reproduce
the observed dark matter abundance translate into decay-lengths for the
next-to-lightest Z2-odd particle which can be macroscopic, potentially leading
to spectacular signatures at the LHC. We characterize the possible signals of
the model according to the spectrum of the Z2-odd particles and we derive, for
each of the cases, bounds on the parameters of the model from current searches.Comment: 19 pages, 7 figures; typos corrected; published versio
Exploring Perturbative Conformal Field Theory in Mellin space

We explore the Mellin representation of correlation functions in conformal
field theories in the weak coupling regime. We provide a complete proof for a
set of Feynman rules to write the Mellin amplitude for a general tree level
Feynman diagram involving only scalar operators. We find a factorised form
involving beta functions associated to the propagators, similar to tree level
Feynman rules in momentum space for ordinary QFTs. We also briefly consider the
case where a generic scalar perturbation of the free CFT breaks conformal
invariance. Mellin space still has some utility and one can consider
non-conformal Mellin representations. In this context, we find that the beta
function corresponding to conformal propagator uplifts to a hypergeometric
function.Comment: 47 pages, 15 figure
Correlation Functions of Coulomb Branch Operators

We consider the correlation functions of Coulomb branch operators in
four-dimensional N=2 Superconformal Field Theories (SCFTs) involving exactly
one anti-chiral operator. These extremal correlators are the "minimal"
non-holomorphic local observables in the theory. We show that they can be
expressed in terms of certain determinants of derivatives of the four-sphere
partition function of an appropriate deformation of the SCFT. This relation
between the extremal correlators and the deformed four-sphere partition
function is non-trivial due to the presence of conformal anomalies, which lead
to operator mixing on the sphere. Evaluating the deformed four-sphere partition
function using supersymmetric localization, we compute the extremal correlators
explicitly in many interesting examples. Additionally, the representation of
the extremal correlators mentioned above leads to a system of integrable
differential equations. We compare our exact results with previous perturbative
computations and with the four-dimensional tt^* equations. We also use our
results to study some of the asymptotic properties of the perturbative series
expansions we obtain in N=2 SQCD.Comment: 47 pages, 6 figures. v2: typos corrected and references adde
Twofold Symmetries of the Pure Gravity Action

We recast the action of pure gravity into a form that is invariant under a
twofold Lorentz symmetry. To derive this representation, we construct a general
parameterization of all theories equivalent to the Einstein-Hilbert action up
to a local field redefinition and gauge fixing. We then exploit this freedom to
eliminate all interactions except those exhibiting two sets of independently
contracted Lorentz indices. The resulting action is local, remarkably simple,
and naturally expressed in a field basis analogous to the exponential
parameterization of the nonlinear sigma model. The space of twofold Lorentz
invariant field redefinitions then generates an infinite class of equivalent
representations. By construction, all off-shell Feynman diagrams are twofold
Lorentz invariant while all on-shell tree amplitudes are automatically twofold
gauge invariant. We extend our results to curved spacetime and calculate the
analogue of the Einstein equations. While these twofold invariances are hidden
in the canonical approach of graviton perturbation theory, they are naturally
expected given the double copy relations for scattering amplitudes in gauge
theory and gravity.Comment: 24 page
Partial SUSY Breaking for Asymmetric Gepner Models and Non-geometric
  Flux Vacua

Using the method of simple current extensions, asymmetric Gepner models of
Type IIB with N=1 space-time supersymmetry are constructed. The combinatorics
of the massless vector fields suggests that these classical Minkowski string
vacua provide fully backreacted solutions corresponding to N=1 minima of N=2
gauged supergravity. The latter contain abelian gaugings along the axionic
isometries in the hypermultiplet moduli space, and can be considered as Type
IIB flux compactifications on Calabi-Yau manifolds equipped with
(non-)geometric fluxes. For a particular class of asymmetric Gepner models, we
are able to explicitly specify the underlying CICYs and to check necessary
conditions for a GSUGRA interpretation. If this conjecture is correct, there
exists a large class of exactly solvable non-geometric flux compactifications
on CY threefolds.Comment: 33 pages; v2: references adde
Black string first order flow in N=2, d=5 abelian gauged supergravity

We derive both BPS and non-BPS first-order flow equations for magnetically
charged black strings in five-dimensional N=2 abelian gauged supergravity,
using the Hamilton-Jacobi formalism. This is first done for the coupling to
vector multiplets only and U(1) Fayet-Iliopoulos (FI) gauging, and then
generalized to the case where also hypermultiplets are present, and abelian
symmetries of the quaternionic hyperscalar target space are gauged. We then use
these results to derive the attractor equations for near-horizon geometries of
extremal black strings, and solve them explicitely for the case where the
constants appearing in the Chern-Simons term of the supergravity action satisfy
an adjoint identity. This allows to compute in generality the central charge of
the two-dimensional conformal field theory that describes the black strings in
the infrared, in terms of the magnetic charges, the CY intersection numbers and
the FI constants. Finally, we extend the r-map to gauged supergravity and use
it to relate our flow equations to those in four dimensions.Comment: 21 pages, uses jheppub.sty. v2: Minor errors corrected, refs. added.
  v3: Minor error corrected in app. B, small discussion of string theory
  realization added in final remark
Revisiting Supernova 1987A Constraints on Dark Photons

We revisit constraints on dark photons with masses below ~ 100 MeV from the
observations of Supernova 1987A. If dark photons are produced in sufficient
quantity, they reduce the amount of energy emitted in the form of neutrinos, in
conflict with observations. For the first time, we include the effects of
finite temperature and density on the kinetic-mixing parameter, epsilon, in
this environment. This causes the constraints on epsilon to weaken with the
dark-photon mass below ~ 15 MeV. For large-enough values of epsilon, it is well
known that dark photons can be reabsorbed within the supernova. Since the rates
of reabsorption processes decrease as the dark-photon energy increases, we
point out that dark photons with energies above the Wien peak can escape
without scattering, contributing more to energy loss than is possible assuming
a blackbody spectrum. Furthermore, we estimate the systematic uncertainties on
the cooling bounds by deriving constraints assuming one analytic and four
different simulated temperature and density profiles of the proto-neutron star.
Finally, we estimate also the systematic uncertainty on the bound by varying
the distance across which dark photons must propagate from their point of
production to be able to affect the star. This work clarifies the bounds from
SN1987A on the dark-photon parameter space.Comment: 20 pages + 13 pages appendices/references, 8 figures. v2: Minor
  corrections leading to small changes to the excluded parameter region
  (conclusions unchanged); added more discussion of supernova uncertainties;
  replaced with version accepted by JHEP. v3: Updated supernova temperature and
  density profiles; excluded regions changed slightly, but conclusions
  otherwise unchange
Wilsonian Effective Action of Superstring Theory

By integrating out the heavy fields in type II or heterotic string field
theory one can construct the effective action for the light fields. This
effective theory inherits all the algebraic structures of the parent theory and
the effective action automatically satisfies the Batalin-Vilkovisky quantum
master equation. This theory is manifestly ultraviolet finite, has only light
fields as its explicit degrees of freedom, and the Feynman diagrams of this
theory reproduce the exact scattering amplitudes of light states in string
theory to any arbitrary order in perturbation theory. Furthermore in this
theory the degrees of freedom of light fields above certain energy scale are
also implicitly integrated out. This energy scale is determined by a particular
parameter labelling a family of equivalent actions, and can be made arbitrarily
low, leading to the interpretation of the effective action as the Wilsonian
effective action.Comment: LaTeX, 26 page
The Asymptotic Form of Non-Global Logarithms, Black Disc Saturation, and
  Gluonic Deserts

We develop an asymptotic perturbation theory for the large logarithmic
behavior of the non-linear integro-differential equation describing the soft
correlations of QCD jet measurements, the Banfi-Marchesini-Smye (BMS) equation.
This equation captures the late-time evolution of radiating color dipoles after
a hard collision. This allows us to prove that at large values of the control
variable (the non-global logarithm, a function of the infra-red energy scales
associated with distinct hard jets in an event), the distribution has a
gaussian tail. We compute the decay width analytically, giving a closed form
expression, and find it to be jet geometry independent, up to the number of
legs of the dipole in the active jet. Enabling the asymptotic expansion is the
correct perturbative seed, where we perturb around an anzats encoding formally
no real emissions, an intuition motivated by the buffer region found in jet
dynamics. This must be supplemented with the correct application of the BFKL
approximation to the BMS equation in collinear limits. Comparing to the
asymptotics of the conformally related evolution equation encountered in
small-x physics, the Balitisky-Kovchegov (BK) equation, we find that the
asymptotic form of the non-global logarithms directly maps to the black-disc
unitarity limit of the BK equation, despite the contrasting physical pictures.
Indeed, we recover the equations of saturation physics in the final state
dynamics of QCD.Comment: Fixed factor of 2 in BFKL and corrected comparison to MC (another
  factor of 2 mistake in fits). Clarified discussion. Conclusions unchanged.
  Version submitted to JHE
Quark Mass Correction to Chiral Separation Effect and Pseudoscalar
  Condensate

We derived an analytic structure of the quark mass correction to chiral
separation effect (CSE) in small mass regime. We confirmed this structure by a
D3/D7 holographic model study in a finite density, finite magnetic field
background. The quark mass correction to CSE can be related to correlators of
pseudo-scalar condensate, quark number density and quark condensate in static
limit. We found scaling relations of these correlators with spatial momentum in
the small momentum regime. They characterize medium responses to electric
field, inhomogeneous quark mass and chiral shift. Beyond the small momentum
regime, we found existence of normalizable mode, which possibly leads to
formation of spiral phase. The normalizable mode exists beyond a critical
magnetic field, whose magnitude decreases with quark chemical potential.Comment: 23 pages, 5 figures. additional normalizable modes included,
  published versio
4D Scattering Amplitudes and Asymptotic Symmetries from 2D CFT

We reformulate the scattering amplitudes of 4D flat space gauge theory and
gravity in the language of a 2D CFT on the celestial sphere. The resulting CFT
structure exhibits an OPE constructed from 4D collinear singularities, as well
as infinite-dimensional Kac-Moody and Virasoro algebras encoding the asymptotic
symmetries of 4D flat space. We derive these results by recasting 4D dynamics
in terms of a convenient foliation of flat space into 3D Euclidean AdS and
Lorentzian dS geometries. Tree-level scattering amplitudes take the form of
Witten diagrams for a continuum of (A)dS modes, which are in turn equivalent to
CFT correlators via the (A)dS/CFT dictionary. The Ward identities for the 2D
conserved currents are dual to 4D soft theorems, while the bulk-boundary
propagators of massless (A)dS modes are superpositions of the leading and
subleading Weinberg soft factors of gauge theory and gravity. In general, the
massless (A)dS modes are 3D Chern-Simons gauge fields describing the soft,
single helicity sectors of 4D gauge theory and gravity. Consistent with the
topological nature of Chern-Simons theory, Aharonov-Bohm effects record the
"tracks" of hard particles in the soft radiation, leading to a simple
characterization of gauge and gravitational memories. Soft particle exchanges
between hard processes define the Kac-Moody level and Virasoro central charge,
which are thereby related to the 4D gauge coupling and gravitational strength
in units of an infrared cutoff. Finally, we discuss a toy model for black hole
horizons via a restriction to the Rindler region.Comment: 66 pages, 8 figures; v2: version to appear in JHE
The Flavoured BFSS Model at High Temperature

We study the high temperature series expansion of the Berkooz-Douglas matrix
model which describes the D0/D4--brane system. At high temperature the model is
weakly coupled and we develop the series to second order. We check our results
against the high temperature regime of the bosonic model (without fermions) and
find excellent agreement. We track the temperature dependence of the bosonic
model and find backreaction of the fundamental fields lifts the zero
temperature adjoint mass degeneracy. In the low temperature phase the system is
well described by a gaussian model with three masses $m^t_A=1.964 \pm 0.003$,
$m^l_A=2.001 \pm 0.003$ and $m_f=1.463 \pm 0.001$, the adjoint longitudional
and transverse masses and the mass of the fundamental fields respectively.Comment: 36 pages 11 figures and tables; v2: major revision for clarification,
  numerical results updated and typos correcte
Three-dimensional Spin-3 Theories Based on General Kinematical Algebras

We initiate the study of non- and ultra-relativistic higher spin theories.
For sake of simplicity we focus on the spin-3 case in three dimensions. We
classify all kinematical algebras that can be obtained by all possible
In\"on\"u--Wigner contraction procedures of the kinematical algebra of spin-3
theory in three dimensional (anti-) de Sitter space-time. We demonstrate how to
construct associated actions of Chern--Simons type, directly in the
ultra-relativistic case and by suitable algebraic extensions in the
non-relativistic case. We show how to give these kinematical algebras an
infinite-dimensional lift by imposing suitable boundary conditions in a theory
we call "Carroll Gravity", whose asymptotic symmetry algebra turns out to be an
infinite-dimensional extension of the Carroll algebra.Comment: 32+12 pages, 2 figures; v2: 1 footnote, 4 refs; v3: 1 ref corrected,
  1 ref update