pinecone/core-2020-05-10-deduplication huggingface dataset:
Radiative plateau inflation

We describe how monomial chaotic inflation becomes compatible with the latest
CMB data thanks to radiative corrections producing a plateau. The interactions
of the inflation with other fields, required for reheating, can flatten the
potential and moderate the production of primordial gravitational waves,
keeping these below the current upper bound. We show that the appearance of a
plateau requires that the inflaton couples to fermions and to another scalar or
a gauge group. We give concrete examples of minimal particle physics models
leading to plateaus for quadratic and quartic chaotic inflation. We also
provide a three-parameter model-independent description of radiatively
corrected inflation that is amenable to CMB analyses.Comment: JHEP versio
Spontaneous symmetry breaking in the $S_3$-symmetric scalar sector

We present a detailed study of the vacua of the $S_3$-symmetric
three-Higgs-doublet potential, specifying the region of parameters where these
minimisation solutions occur. We work with a CP conserving scalar potential and
analyse the possible real and complex vacua with emphasis on the cases in which
the CP symmetry can be spontaneously broken. Results are presented both in the
reducible-representation framework of Derman, and in the
irreducible-representation framework. Mappings between these are given. Some of
these implementations can in principle accommodate dark matter and for that
purpose it is important to identify the residual symmetries of the potential
after spontaneous symmetry breakdown. We are also concerned with constraints
from vacuum stability.Comment: 37 pages. v2: Minor changes in the references, matches published
  version. v3: Table 6 corrected: two additional cases conserve CP. Related
  discussion adapted. Version consistent with JHEP Erratu
Orbifolds, Defects and Sphere Partition Function

Gauge theories in the presence of codimension two vortex defects are known to
be related to the theories on orbifolds. By using this relation we study the
localized path integrals of 2D N=(2,2) SUSY gauge theories with point-like
vortex defects. We present a formula for the correlation functions of vortex
defects inserted at the north and the south poles of squashed spheres. For
Abelian gauge theories the correlators are locally constant as functions of the
parameters of the defect, but exhibit discontinuity at some threshold values
determined by the deficit angle at the poles and the R-charges of the matter
multiplets. For non-Abelian gauge groups the correlators depend non-trivially
on the types of gauge symmetry breaking due to the defects.Comment: 1+24 pages, v4: a major revision reflecting the result of the
  followup work arXiv:1705:1062
Mono-jet, -photon and -Z Signals of a Supersymmetric (B-L) model at the
  Large Hadron Collider

Search for invisible final states produced at the Large Hadron Collider (LHC)
by new physics scenarios are normally carried out resorting to a variety of
probes emerging from the initial state, in the form of single-jet, -photon and
-$Z$ boson signatures. These are particularly effective for models of
Supersymmetry (SUSY) in presence of $R$-parity conservation, owing to the
presence in their spectra of a stable neutralino as dark matter candidate. We
assume here as theoretical framework Supersymmetric ($B-L$) extension of the
Standard Model (BLSSM), wherein a mediator for invisible decays can be $Z'$
boson. The peculiarity of the signal is thus that the final state objects carry
a very large (transverse) missing energy, since the $Z'$ is naturally massive
and constrained by direct searches and electro-weak precision tests to be at
least in TeV scale region. Under these circumstances the efficiency in
accessing the invisible final state and rejecting the standard model background
is very high. This somehow compensates the rather meagre production rates.
Another special feature of this invisible BLSSM signal is its composition,
which is often dominated by sneutrino decays (alongside the more traditional
neutrino and neutralino modes). Sensitivity of the CERN machine to these two
features can therefore help disentangling the BLSSM from more popular SUSY
models. We assess in this analysis the scope of the LHC in establishing the
aforementioned invisible signals through a sophisticated signal-to-background
simulation carried out in presence of parton shower, hadronisation and detector
effects. We find that significant sensitivity exists already after 300
fb$^{-1}$ during Run 2. We find that mono-jet events can be readily accessible
at the LHC, so as to enable one to claim a prompt discovery, while mono-photon
and -$Z$ signals can be used as diagnostic tools of the underlying scenario.Comment: 21 pages, 13 figures and 9 table
Algebraic Bethe Ansatz for O(2N) sigma models with integrable diagonal
  boundaries

The finite volume problem of O(2N) sigma models with integrable diagonal
boundaries on a finite interval is investigated. The double row transfer matrix
is diagonalized by Algebraic Bethe Ansatz. The boundary Bethe Yang equations
for the particle rapidities and the accompanying Bethe Ansatz equations are
derived.Comment: 32 pages Discussion of the crossing property of the double row
  transfer matrix as well as its eigenvalue on the pseudovacuum included.
  Version accepted for JHEP v3 Note added, typos correcte
Exclusive Radiative Z-Boson Decays to Mesons with Flavor-Singlet
  Components

We present a detailed study of the exclusive radiative decays
$Z\to\eta^{(\prime)}\gamma$ employing the QCD factorization approach. We derive
a factorization formula for the decay amplitudes valid at leading power in an
expansion in $(\Lambda_{QCD}/m_Z)^2$, which includes convolutions of calculable
hard-scattering kernels with the leading-twist quark and gluon light-cone
distribution amplitudes of the mesons. Large logarithms arising in the
evolution from the high scale $m_Z$ down to hadronic scales are resummed using
the renormalization group, carefully accounting for the effects of the heavy
bottom and charm quarks. Our results for the branching ratios are very
sensitive to hadronic input parameters, such as the decay constants and mixing
angle characterizing the $\eta-\eta'$ system. Using the most recent estimates
of these parameters, we obtain the branching ratios $Br(Z\to\eta\gamma)\sim
1.6\cdot 10^{-10}$ and $Br(Z\to\eta'\gamma)\sim 4.7\cdot 10^{-9}$. A
measurement of these processes at a future high-luminosity Z factory could
provide interesting information on the gluon distribution amplitude.Comment: 16 pages plus appendix, 2 figures, 4 table
On Supersymmetry, Boundary Actions and Brane Charges

Supersymmetry transformations change the Lagrangian $\mathscr{L}$ into a
total derivative $\delta \mathscr{L} = \partial_\mu \mathcal{V}^{\mu}$. On
manifolds with boundaries the total derivative term is an obstruction to
preserving supersymmetry. Such total derivative terms can be canceled by a
boundary action without specifying boundary conditions, but only for a
subalgebra of supersymmetry. We study compensating boundary actions for
$\mathcal{N}=1$ supersymmetry in 4d, and show that they are determined
independently of the details of the theory and of the boundary conditions. Two
distinct classes of boundary actions exist, which correspond to preserving
either a linear combination of supercharges of opposite chirality (called
A-type) or supercharges of opposite chirality independently (B-type). The first
option preserves a subalgebra isomorphic to $\mathcal{N} = 1$ in 3d, while the
second preserves only a 2d subgroup of the Lorentz symmetry and a subalgebra
isomorphic to $\mathcal{N} = (0,2)$ in 2d. These subalgebras are in one to one
correspondence with half-BPS objects: the A-type corresponds to domain walls
while the B-type corresponds to strings. We show that integrating the full
current algebra and taking into account boundary contributions leads to an
energy-momentum tensor which contains the boundary terms. The boundary terms
come from the domain wall and string currents in the two respective cases.Comment: 31 pages, 1 figur
Dynamically assisted Sauter-Schwinger effect in inhomogeneous electric
  fields

Via the worldline instanton method, we study electron-positron pair creation
by a strong electric field of the profile $E/\cosh^2(kx)$ superimposed by a
weaker pulse $E'/\cosh^2(\omega t)$. If the temporal Keldysh parameter
$\gamma_\omega=m\omega/(qE)$ exceeds a threshold value $\gamma_\omega^{\rm
crit}$ which depends on the spatial Keldysh parameter $\gamma_k=mk/(qE)$, we
find a drastic enhancement of the pair creation probability -- reporting on
what we believe to be the first analytic non-perturbative result for the
interplay between temporal and spatial field dependences $E(t,x)$ in the
Sauter-Schwinger effect.Comment: 13 pages, 4 figure
Three-point functions in ${\cal N}=4$ SYM: the hexagon proposal at three
  loops

Basso, Komatsu and Vieira recently proposed an all-loop framework for the
computation of three-point functions of single-trace operators of ${\cal N}=4$
super-Yang-Mills, the "hexagon program". This proposal results in several
remarkable predictions, including the three-point function of two protected
operators with an unprotected one in the $SU(2)$ and $SL(2)$ sectors. Such
predictions consist of an "asymptotic" part---similar in spirit to the
asymptotic Bethe Ansatz of Beisert and Staudacher for two-point functions---as
well as additional finite-size "wrapping" L\"uscher-like corrections. The focus
of this paper is on such wrapping corrections, which we compute at three-loops
in the $SL(2)$ sector. The resulting structure constants perfectly match the
ones obtained in the literature from four-point correlators of protected
operators.Comment: 18 pages, 3 tables; v2: note added, ref. added, (some) misprints
  corrected; v3: more ref. added, more misprints correcte
Is the Relaxion an Axion?

We consider the recently proposed cosmological relaxation mechanism where the
hierarchy problem is ameliorated, and the electroweak scale is dynamically
selected by a slowly rolling axion field. We argue that, in its simplest form,
the construction breaks a gauge symmetry that always exists for
pseudo-Nambu-Goldstone bosons (in particular the axion). The small parameter in
the relaxion model is therefore not technically natural as it breaks a gauge
symmetry rather than global symmetries only. The consistency of the theory
generically implies that the cutoff must lie around the electroweak scale, but
not qualitatively higher. We discuss several ways to evade the above
conclusion. Some of them may be sufficient to increase the cutoff to the
few-TeV range (and therefore may be relevant for the little-hierarchy problem).
To demonstrate the ideas in a concrete setting we consider a model with a
familon, the Nambu-Goldstone boson of a spontaneously broken chiral flavor
symmetry. The model has some interesting collider-physics aspects and contains
a viable weakly interacting dark matter candidate.Comment: some typos fixed, clarifications adde
The unitary conformal field theory behind 2D Asymptotic Safety

Being interested in the compatibility of Asymptotic Safety with Hilbert space
positivity (unitarity), we consider a local truncation of the functional RG
flow which describes quantum gravity in $d>2$ dimensions and construct its
limit of exactly two dimensions. We find that in this limit the flow displays a
nontrivial fixed point whose effective average action is a non-local functional
of the metric. Its pure gravity sector is shown to correspond to a unitary
conformal field theory with positive central charge $c=25$. Representing the
fixed point CFT by a Liouville theory in the conformal gauge, we investigate
its general properties and their implications for the Asymptotic Safety
program. In particular, we discuss its field parametrization dependence and
argue that there might exist more than one universality class of metric gravity
theories in two dimensions. Furthermore, studying the gravitational dressing in
2D asymptotically safe gravity coupled to conformal matter we uncover a
mechanism which leads to a complete quenching of the a priori expected
Knizhnik-Polyakov-Zamolodchikov (KPZ) scaling. A possible connection of this
prediction to Monte Carlo results obtained in the discrete approach to 2D
quantum gravity based upon causal dynamical triangulations is mentioned.
Similarities of the fixed point theory to, and differences from, non-critical
string theory are also described. On the technical side, we provide a detailed
analysis of an intriguing connection between the Einstein-Hilbert action in
$d>2$ dimensions and Polyakov's induced gravity action in two dimensions.Comment: 64 page
World-volume Effective Action of Exotic Five-brane in M-theory

We study the world-volume effective action of an exotic five-brane, known as
the M-theory 5${}^3$-brane (M5${}^3$-brane) in eleven dimensions. The
supermultiplet of the world-volume theory is the $\mathcal{N} = (2, 0)$ tensor
multiplet in six dimensions. The world-volume action contains three Killing
vectors $\hat{k}_{\hat{I}} {}^M \ (\hat{I} =1,2,3)$ associated with the
$U(1)^3$ isometry. We find the effective T-duality rule for the
eleven-dimensional backgrounds that transforms the M5-brane effective action to
that of the M5${}^3$-brane. We also show that our action provides the source
term for the M5${}^3$-brane geometry in eleven-dimensional supergravityComment: 23 pages, comments and references added, version published in JHE
Bridging Soft-Hard Transport Properties of Quark-Gluon Plasmas with
  CUJET3.0

A new model of jet quenching in nuclear collisions, CUJET3.0, is constructed
by generalizing the perturbative QCD based CUJET2.0 model to include two
complementary non-perturbative features of the QCD confinement cross-over phase
transition near $T_c\approx 160$ MeV: (1) the suppression of quark and gluon
degrees of freedom and (2) the emergence of chromo-magnetic monopole degrees of
freedom. Such a semi-Quark-Gluon-Monopole Plasma (sQGMP) microscopic scenario
is tested by comparing predictions of the leading hadron nuclear modification
factors, $R^h_{AA}(p_T>10{\rm GeV/c},\sqrt{s})$, and their azimuthal elliptic
asymmetry $v^h_2(p_T>10{\rm GeV/c},\sqrt{s})$ with available data on
$h=\pi,D,B$ jet fragments from nuclear collisions at RHIC($\sqrt{s}=0.2$ ATeV)
and LHC($\sqrt{s}$=2.76 ATeV). The sQGMP model is shown to solve the long
standing $R_{AA}$ vs $v_2$ puzzle by predicting a maximum of the jet quenching
parameter field $\hat{q}(E,T)/T^3$ near $T_c$. The consistency of jet quenching
with observed bulk perfect fluidity is demonstrated by extrapolating the sQGMP
$\hat{q}$ down to thermal energy $E\sim 3 T$ scales and showing that the sQGMP
shear viscosity to entropy density ratio $\eta/s \approx T^3/\hat{q}$ falls
close to the unitarity bound, $1/4\pi$, in the range $(1-2)T_c$. Detailed
comparisons of CUJET2.0 and CUJET3.0 reveal that the remarkably different
$\hat{q}(T)$ could be consistent with the same $R_{AA}$ data and could only be
distinguished by anisotropy observables. These findings demonstrate clearly the
inadequacy of focusing on the jet path averaged quantity $<\hat{q}>$ as the
only relevant medium property to characterize jet quenching, and point to the
crucial roles of other essential factors, such as the chromo electric and
magnetic composites of the plasma, the screening masses and the running
couplings at multiple scales that all strongly influence jet energy loss.Comment: 50 pages, 14 figures; v3: typos corrected, new references and
  discussions included; published in JHE
Little strings and T-duality

We study the 2d N = 4 gauge theory descriptions of little strings on type II
NS5- branes. The IIB strings on N NS5-branes are described by the N = (4,4)
gauge theories, whose Higgs branch CFTs on U(N) instanton moduli spaces are
relevant. The IIA strings are described by N = (4,4) circular A_{N-1} quiver
theories, whose Coulomb branch CFTs are relevant. We study new N = (0,4) quiver
gauge theories for the IIA strings, which make it easier to study some infrared
observables. In particular, we show that the elliptic genera of the IIA / IIB
strings precisely map to each other by T-duality.Comment: 34 pages, 5 figure
On excited states in real-time AdS/CFT

The Skenderis-van Rees prescription, which allows the calculation of
time-ordered correlation functions of local operators in CFT's using
holographic methods is studied and applied for excited states. Calculation of
correlators and matrix elements of local CFT operators between generic in/out
states are carried out in global Lorentzian AdS. We find the precise form of
such states, obtain an holographic formula to compute the inner product between
them, and using the consistency with other known prescriptions, we argue that
the in/out excited states built according to the Skenderis-Van Rees
prescription correspond to {\it coherent} states in the (large-$N$) AdS-Hilbert
space. This is confirmed by explicit holographic computations. The outcome of
this study has remarkable implications on generalizing the Hartle-Hawking
construction for wave functionals of excited states in AdS quantum gravity.Comment: 16 pages, 6 figures, accepted for publication by JHE
Bremsstrahlung function, leading Luscher correction at weak coupling and
  localization

We discuss the near BPS expansion of the generalized cusp anomalous dimension
with L units of R-charge. Integrability provides an exact solution, obtained by
solving a general TBA equation in the appropriate limit: we propose here an
alternative method based on supersymmetric localization. The basic idea is to
relate the computation to the vacuum expectation value of certain 1/8 BPS
Wilson loops with local operator insertions along the contour. These
observables localize on a two-dimensional gauge theory on S^2, opening the
possibility of exact calculations. As a test of our proposal, we reproduce the
leading Luscher correction at weak coupling to the generalized cusp anomalous
dimension. This result is also checked against a genuine Feynman diagram
approach in N=4 Super Yang-Mills theory.Comment: 25 pages, 6 figures. References added and typos correcte
Suppressing gravitino thermal production with a temperature-dependent
  messenger coupling

We show that the constraints on GMSB theories from the gravitino cosmology
can be significantly relaxed if the messenger-spurion coupling is temperature
dependent. We demonstrate this novel mechanism in a scenario in which this
coupling depends on the VEV of an extra singlet field $S$ that interacts with
the thermalized plasma which can result in a significantly suppressed gravitino
production rate. In such a scenario the relic gravitino abundance is determined
by the thermal dynamics of the $S$ field and it is easy to fit the observed
dark matter abundance evading the stringent constraints on the reheating
temperature, thus making gravitino dark matter consistent with thermal
leptogenesis.Comment: 27 pages, 6 figures, 3 tables, plain tex
Electric Dipole Moments of Charged Leptons with Sterile Fermions

We address the impact of sterile fermions on charged lepton electric dipole
moments. Any experimental signal of these observables calls for scenarios of
physics beyond the Standard Model providing new sources of CP violation. In
this work, we consider a minimal extension of the Standard Model via the
addition of sterile fermions which mix with active neutrinos and we derive the
corresponding analytical expressions for the electric dipole moments of charged
leptons at two-loop order. Our study reveals that, in order to have a
non-vanishing contribution in this framework, the minimal extension
necessitates the addition of at least 2 sterile fermion states to the Standard
Model field content. Our conclusion is that sterile neutrinos can give
significant contributions to the charged lepton electric dipole moments, some
of them lying within present and future experimental sensitivity if the masses
of the non-degenerate sterile states are both above the electroweak scale. The
Majorana nature of neutrinos is also important in order to allow for
significative contributions to the charged lepton electric dipole moments. In
our analysis we impose all available experimental and observational constraints
on sterile neutrinos and we further discuss the prospect of probing this
scenario at low and high energy experiments.Comment: 25 pages, 6 figures, version published in JHE
Quantum Jump from Singularity to Outside of Black Hole

Considering the role of black hole singularity in quantum evolution, a
resolution to the firewall paradox is presented. It is emphasized that if an
observer has the singularity as a part of his spacetime, then the
semi-classical evolution would be non-unitary as viewed by him. Specifically, a
free-falling observer inside the black hole would have a Hilbert space with
non-unitary evolution; a quantum jump for particles encountering the
singularity to outside of the horizon as late Hawking radiations. The
non-unitariness in the jump resembles the one in collapse of wave function, but
preserves entanglements. Accordingly, we elaborate the first postulate of black
hole complementarity: freely falling observers who pass through the event
horizon would have non-unitary evolution, while it does not have physically
measurable effects for them. Besides, no information would be lost in the
singularity. Taking the modified picture into account, the firewall paradox can
be resolved, respecting No Drama. A by-product of our modification is that
roughly half of the entropy of the black hole is released close to the end of
evaporation in the shape of very hot Hawking radiation.Comment: 7 figures, v2 more comprehensive, v3 matches the published versio
A Case Study of the Sensitivity to LFV Operators with Precision
  Measurements and the LHC

We compare the sensitivity of precision measurements of lepton flavour
observables to the reach of the LHC in a case study of lepton-flavour violating
operators of dimension six with two leptons and two quarks. For light quarks
precision measurements always yield the more stringent constraints. The LHC
complements precision measurements for operators with heavier quarks.
Competitive limits can already be set on the cutoff scale $\Lambda$ > 600 - 800
GeV for operators with right-handed $\tau$ leptons using the LHC run 1 data.Comment: 22 pages, 2 figures, changed from general effective four fermion
  interactions to gauge invariant operators, matches published versio
On Newton-Cartan trace anomalies

We classify the trace anomaly for parity-invariant non-relativistic
Schr\"odinger theories in 2+1 dimensions coupled to background Newton-Cartan
gravity. The general anomaly structure looks very different from the one in the
z=2 Lifshitz theories. The type A content of the anomaly is remarkably
identical to that of the relativistic 3+1 dimensional case, suggesting the
conjecture that an a-theorem should exist also in the Newton-Cartan context.
  Erratum: due to an overcounting of the number of linearly-independent terms
in the basis, the type A anomaly disappears if Frobenius condition is imposed.
See appended erratum for details. This crucial mistake was pointed out to us in
arXiv:1601.06795.Comment: 16 pages, V2:few equations corrected (final results unchanged),
  references added, typos, V3: erratum include