pinecone/core-2020-05-10-deduplication huggingface dataset:
Neutrino Lines from Majoron Dark Matter

Models with spontaneously broken global lepton number can lead to a
pseudo-Goldstone boson as a long-lived dark matter candidate. Here we revisit
the case of singlet majoron dark matter and discuss multiple constraints. For
masses above MeV, this model could lead to a detectable flux of monochromatic
mass-eigenstate neutrinos, which have flavor ratios that depend strongly on the
neutrino mass hierarchy. We provide a convenient parametrization for the
loop-induced majoron couplings to charged fermions that allows us to discuss
three-generation effects such as lepton flavor violation. These couplings are
independent of the low-energy neutrino parameters but can be constrained by the
majoron decays into charged fermions.Comment: 14 pages; v2: corrected VIB formula, added two-loop diphoton decay;
  to appear in JHE
The Gravitational Sector of 2d (0,2) F-theory Vacua

F-theory compactifications on Calabi-Yau fivefolds give rise to
two-dimensional N=(0,2) supersymmetric field theories coupled to gravity. We
explore the dilaton supergravity defined by the moduli sector of such
compactifications. The massless moduli spectrum is found by uplifting Type IIB
compactifications on Calabi-Yau fourfolds. This spectrum matches expectations
from duality with M-theory on the same elliptic fibration. The latter defines
an N=2 Supersymmetric Quantum Mechanics related to the 2d (0,2) F-theory
supergravity via circle reduction. Using our recent results on the
gravitational anomalies of duality twisted D3-branes wrapping curves in
Calabi-Yau fivefolds we show that the F-theory spectrum is anomaly free. We
match the classical Chern-Simons terms of the M-theory Super Quantum Mechanics
to one-loop contributions to the effective action by S^1 reduction of the dual
F-theory.Comment: 19 pages, v2: JHEP versio
Electron and muon anomalous magnetic dipole moment in a 3-3-1 model

We calculate, in the context of a 3-3-1 model with heavy charged leptons,
constraints on some parameters of the extra particles in the model by imposing
that their contributions to both the electron and muon $(g-2)$ factors are in
agreement with experimental data up to 1$\sigma$-3$\sigma$. In order to obtain
realistic results we use some of the possible solutions of the left- and right-
unitary matrices that diagonalize the lepton mass matrices, giving the observed
lepton masses and at the same time allowing to accommodate the
Pontecorvo-Maki-Nakagawa-Sakata (PMNS) mixing matrix. We show that, at least up
to 1-loop order, in the particular range of the space parameter that we have
explored, it is not possible to fit the observed electron and muon $(g-2)$
factors at the same time unless one of the extra leptons has a mass of the
order of 20-40 GeVs and the energy scale of the 331 symmetry to be of around
60-80 TeVs.Comment: 34 pages, 19 figure
Nonperturbative QED vacuum birefringence

In this paper we represent nonperturbative calculation for one-loop Quantum
Electrodynamics (QED) vacuum birefringence in presence of strong magnetic
field. The dispersion relations for electromagnetic wave propagating in strong
magnetic field point to retention of vacuum birefringence even in case when the
field strength greatly exceeds Sauter-Schwinger limit. This gives a possibility
to extend some predictions of perturbative QED such as electromagnetic waves
delay in pulsars neighbourhood or wave polarization state changing (tested in
PVLAS) to arbitrary magnetic field values. Such expansion is especially
important in astrophysics because magnetic fields of some pulsars and magnetars
greatly exceed quantum magnetic field limit, so the estimates of perturbative
QED effects in this case require clarification.Comment: 4 figure
Boundary scattering in the ϕ4 model.

We study boundary scattering in the ϕ4 model on a half-line with a oneparameter family of Neumann-type boundary conditions. A rich variety of phenomena is observed, which extends previously-studied behaviour on the full line to include regimes of near-elastic scattering, the restoration of a missing scattering window, and the creation of a kink or oscillon through the collision-induced decay of a metastable boundary state. We also study the decay of the vibrational boundary mode, and explore different scenarios for its relaxation and for the creation of kinks
O($N$) Invariance of the Multi-Field Bounce

In his 1977 paper on vacuum decay in field theory: The Fate of the False
Vacuum, Coleman considered the problem of a single scalar field and assumed
that the minimum action tunnelling field configuration, the bounce, is
invariant under O(4) rotations in Euclidean space. A proof of the O(4)
invariance of the bounce was provided later by Coleman, Glaser, and Martin
(CGM), who extended the proof to $N>2$ Euclidean dimensions but, again,
restricted non-trivially to a single scalar field. As far as we know a proof of
O($N$) invariance of the bounce for the tunnelling problem with multiple scalar
fields has not been reported, even though it was assumed in many works since,
being of phenomenological interest. We make progress towards closing this gap.
Following CGM we define the reduced problem of finding a field configuration
minimizing the kinetic energy at fixed potential energy. Given a solution of
the reduced problem, the minimum action bounce can always be obtained from it
by means of a scale transformation. We show that if a solution of the reduced
problem exists, then it and the minimum action bounce derived from it are
indeed O($N$) symmetric.Comment: 10 pages, 1 figure: v3: match journal versio
Resonant CP violation in rare tau decay

In this work, we study the lepton number violating tau decays via
intermediate on-shell Majorana neutrinos $N_j$ into two scalar mesons and a
lepton $\tau^{\pm} \to M_1{}^{\pm} N_j \to M_1^{\pm} M_2^{\pm} \ell^{\mp}$. We
calculate the Branching ratios $Br(\tau^{\pm})$ and the CP asymmetry
$(\Gamma(\tau^+) - \Gamma(\tau^-))/(\Gamma(\tau^+) + \Gamma(\tau^-))$ for such
decays, in a scenario that contain at least two heavy Majorana neutrinos. The
results show that the CP asymmetry is small, but becomes comparable with the
branching ratio ${\rm Br}(\tau^{\pm})$ when their mass difference is comparable
with their decay width, $\Delta M_N \sim \Gamma_N$. On the other hand, we
present regions of the heavy-light neutrino mixing elements, in which the $CP$
asymmetry could be explore in future tau factories.Comment: 18 pages, New reference
Spatially modulated instabilities of holographic gauge-gravitational
  anomaly

We performed a study of the perturbative instabilities in
Einstein-Maxwell-Chern-Simons theory with a gravitational Chern-Simons term,
which is dual to a strongly coupled field theory with both chiral and mixed
gauge-gravitational anomaly. With an analysis of the fluctuations in the near
horizon regime at zero temperature, we found that there might be two possible
sources of instabilities. The first one corresponds to a real mass-squared
which is below the BF bound of AdS$_2$, and it leads to the bell-curve phase
diagram at finite temperature. The effect of mixed gauge-gravitational anomaly
is emphasised. Another source of instability is independent of gauge
Chern-Simons coupling and exists for any finite gravitational Chern-Simons
coupling. There is a singular momentum close to which unstable mode appears.
The possible implications of this singular momentum are discussed. Our analysis
suggests that the theory with a gravitational Chern-Simons term around
Reissner-Nordstr\"om black hole is unreliable unless the gravitational
Chern-Simons coupling is treated as a small perturbative parameter.Comment: 24 pages, 8 figures. v2: refs added, minor improvements, a new
  appendix adde
(2,2) Superconformal Bootstrap in Two Dimensions

We find a simple relation between two-dimensional BPS N=2 superconformal
blocks and bosonic Virasoro conformal blocks, which allows us to analyze the
crossing equations for BPS 4-point functions in unitary (2,2) superconformal
theories numerically with semidefinite programming. We constrain gaps in the
non-BPS spectrum through the operator product expansion of BPS operators, in
ways that depend on the moduli of exactly marginal deformations through chiral
ring coefficients. In some cases, our bounds on the spectral gaps are observed
to be saturated by free theories, by N=2 Liouville theory, and by certain
Landau-Ginzburg models.Comment: 56 pages, 14 figure
Supersymmetry in Open Superstring Field Theory

We realize the 16 unbroken supersymmetries on a BPS D-brane as invariances of
the action of the corresponding open superstring field theory. We work in the
small Hilbert space approach, where a symmetry of the action translates into a
symmetry of the associated cyclic $A_\infty$ structure. We compute the
supersymmetry algebra, being careful to disentangle the components which
produce a translation, a gauge transformation, and a symmetry transformation
which vanishes on-shell. Via the minimal model theorem, we illustrate how
supersymmetry of the action implies supersymmetry of the tree level open string
scattering amplitudes.Comment: 37 page
Black holes and solitons in an extended Proca theory

We study a massive vector tensor theory that acquires mass via a standard
Proca term but also via a higher order term containing an explicit coupling to
curvature. We find static solutions that are asymptotically flat, adS or
Lifshitz black holes. Since the higher order term regularizes the effect of the
Proca mass term, generically solutions are asymptotically regular for arbitrary
couplings. This is true in particular for asymptotically flat black holes. For
a particular coupling we find particle like solitons that have a regular and
non trivial geometry everywhere. In all adS solutions the Proca mass term plays
the role of an effective cosmological constant distinctly different from the
bare cosmological constant.Comment: 21 pages and 5 figures, regular article, minor changes and references
  adde
A hybrid setup for fundamental unknowns in neutrino oscillations using
  T2HK ($\nu$) and $\mu$-DAR ($\bar{\nu}$)

Neutrino mass hierarchy, CP-violation, and octant of $\theta_{23}$ are the
fundamental unknowns in neutrino oscillations. In order to address all these
three unknowns, we study the physics reach of a setup, where we replace the
antineutrino run of T2HK with antineutrinos from muon decay at rest
($\mu$-DAR). This approach has the advantages of having higher statistics in
both neutrino and antineutrino modes, and lower beam-on backgrounds for
antineutrino run with reduced systematics. We find that a hybrid setup
consisting of T2HK ($\nu$) and $\mu$-DAR ($\bar\nu$) in conjunction with full
exposure from T2K and NO$\nu$A can resolve the issue of mass hierarchy at
greater than 3$\sigma$ C.L. irrespective of the choices of hierarchy,
$\delta_{\mathrm{CP}}$, and $\theta_{23}$. This hybrid setup can also establish
the CP-violation at 5$\sigma$ C.L. for $\sim$ 55% choices of
$\delta_{\mathrm{CP}}$, whereas the same for conventional T2HK ($\nu +
\bar\nu$) setup along with T2K and NO$\nu$A is around 30%. As far as the octant
of $\theta_{23}$ is concerned, this hybrid setup can exclude the wrong octant
at 5$\sigma$ C.L. if $\theta_{23}$ is at least $3^{\circ}$ away from maximal
mixing for any $\delta_{\mathrm{CP}}$.Comment: 18 pages, 28 pdf figures, 1 table. Minor changes in the text. A new
  footnote added. Accepted in JHE
Renormalisation-group improved analysis of $\mu\to e$ processes in a
  systematic effective-field-theory approach

In this article, a complete analysis of the three muonic lepton-flavour
violating processes $\mu\to e \gamma$, $\mu\to 3e$ and coherent nuclear $\mu\to
e$ conversion is performed in the framework of an effective theory with
dimension six operators defined below the electroweak symmetry breaking scale
$m_W$. The renormalisation-group evolution of the Wilson coefficients between
$m_W$ and the experimental scale is fully taken into account at the leading
order in QCD and QED, and explicit analytic and numerical evolution matrices
are given. As a result, muonic decay and conversion rates are interpreted as
functions of the Wilson coefficients at any scale up to $m_W$. Taking the
experimental limits on these processes as input, the phenomenology of the
mixing effects is investigated. It is found that a considerable set of Wilson
coefficients unbounded in the simplistic tree-level approach are instead
severely constrained. In addition, correlations among operators are studied
both in the light of current data and future experimental prospects.Comment: V1: 28 pages, 5 figures; V2: references added; V3: minor corrections,
  conclusion unchange
Super-Laplacians and their symmetries

A super-Laplacian is a set of differential operators in superspace whose
highest-dimensional component is given by the spacetime Laplacian. Symmetries
of super-Laplacians are given by linear differential operators of arbitrary
finite degree and are determined by superconformal Killing tensors. We
investigate these operators and their symmetries in flat superspaces. The
differential operators form an algebra which can be identified in many cases
with the tensor algebra of the relevant superconformal Lie algebra modulo a
certain ideal, and which have applications to Higher Spin theories.Comment: 25 pages, References and comments adde
On higher-spin supertranslations and superrotations

We study the large gauge transformations of massless higher-spin fields in
four-dimensional Minkowski space. Upon imposing suitable fall-off conditions,
providing higher-spin counterparts of the Bondi gauge, we observe the existence
of an infinite-dimensional asymptotic symmetry algebra. The corresponding Ward
identities can be held responsible for Weinberg's factorization theorem for
amplitudes involving soft particles of spin greater than two.Comment: Motivations and clarifications added. Matches published versio
Four-Dimensional N=2 Supersymmetric Theory with Boundary as a
  Two-Dimensional Complex Toda Theory

We perform a series of dimensional reductions of the 6d, $\mathcal{N}=(2,0)$
SCFT on $S^2\times\Sigma\times I\times S^1$ down to 2d on $\Sigma$. The
reductions are performed in three steps: (i) a reduction on $S^1$ (accompanied
by a topological twist along $\Sigma$) leading to a supersymmetric Yang-Mills
theory on $S^2\times\Sigma\times I$, (ii) a further reduction on $S^2$
resulting in a complex Chern--Simons theory defined on $\Sigma\times I$, with
the real part of the complex Chern-Simons level being zero, and the imaginary
part being proportional to the ratio of the radii of $S^2$ and $S^1$, and (iii)
a final reduction to the boundary modes of complex Chern--Simons theory with
the Nahm pole boundary condition at both ends of the interval $I$, which gives
rise to a complex Toda CFT on the Riemann surface $\Sigma$. As the reduction of
the 6d theory on $\Sigma$ would give rise to an $\mathcal{N}=2$ supersymmetric
theory on $S^2\times I\times S^1$, our results imply a 4d-2d duality between
four-dimensional $\mathcal{N}=2$ supersymmetric theory with boundary and
two-dimensional complex Toda theory.Comment: 29 pages, minor changes, published versio
$\theta$ and the $\eta^\prime$ in Large $N$ Supersymmetric QCD

We study the large $N$ $\theta$ dependence and the $\eta^\prime$ potential in
supersymmetric QCD with small soft SUSY-breaking terms. Known exact results in
SUSY QCD are found to reflect a variety of expectations from large $N$
perturbation theory, including the presence of branches and the behavior of
theories with matter (both with $N_f \ll N$ and $N_f \sim N$). However, there
are also striking departures from ordinary QCD and the conventional large $N$
description: instanton effects, when under control, are not exponentially
suppressed at large $N$, and branched structure in supersymmetric QCD is always
associated with approximate discrete symmetries. We suggest that these
differences motivate further study of large $N$ QCD on the lattice.Comment: 20 pages; v2: references updated; v3: expanded introduction, accepted
  for publication in JHE
(3+1)-dimensional topological phases and self-dual quantum geometries
  encoded on Heegard surfaces

We apply the recently suggested strategy to lift state spaces and operators
for (2+1)-dimensional topological quantum field theories to state spaces and
operators for a (3+1)-dimensional TQFT with defects. We start from the
(2+1)-dimensional Turaev-Viro theory and obtain a state space, consistent with
the state space expected from the Crane-Yetter model with line defects. This
work has important applications for quantum gravity as well as the theory of
topological phases in (3+1) dimensions. It provides a self-dual quantum
geometry realization based on a vacuum state peaked on a homogeneously curved
geometry. The state spaces and operators we construct here provide also an
improved version of the Walker-Wang model, and simplify its analysis
considerably. We in particular show that the fusion bases of the
(2+1)-dimensional theory lead to a rich set of bases for the (3+1)-dimensional
theory. This includes a quantum deformed spin network basis, which in a loop
quantum gravity context diagonalizes spatial geometry operators. We also obtain
a dual curvature basis, that diagonalizes the Walker-Wang Hamiltonian.
Furthermore, the construction presented here can be generalized to provide
state spaces for the recently introduced dichromatic four-dimensional manifold
invariants.Comment: 27 pages, many figures, v2: minor correction
Structure constants at wrapping order

We consider structure constants of single trace operators in planar
$\mathcal{N}$ = 4 Super-Yang-Mills theory within the hexagon framework. The
standard procedure for forming a three point function out of two hexagons
develops divergences when the effects of virtual particles wrapping around the
operators are taken into account. In this paper, we explain how to renormalize
these divergences away and obtain definite predictions, at the leading wrapping
order, for some of the structure constants that parameterize the OPE of two
chiral primaries. We test our method at weak coupling against the four loop
planar correction to the BPS-BPS-Konishi OPE coefficient, derived recently in
the field theory. At strong coupling, we compare our expressions with the
structure constants obtained in string theory for three semiclassical strings.Comment: 69 page
Local criticality, diffusion and chaos in generalized Sachdev-Ye-Kitaev
  models

The Sachdev-Ye-Kitaev model is a $(0+1)$-dimensional model describing
Majorana fermions or complex fermions with random interactions. This model has
various interesting properties such as approximate local criticality (power law
correlation in time), zero temperature entropy, and quantum chaos. In this
article, we propose a higher dimensional generalization of the
Sachdev-Ye-Kitaev model, which is a lattice model with $N$ Majorana fermions at
each site and random interactions between them. Our model can be defined on
arbitrary lattices in arbitrary spatial dimensions. In the large $N$ limit, the
higher dimensional model preserves many properties of the Sachdev-Ye-Kitaev
model such as local criticality in two-point functions, zero temperature
entropy and chaos measured by the out-of-time-ordered correlation functions. In
addition, we obtain new properties unique to higher dimensions such as
diffusive energy transport and a "butterfly velocity" describing the
propagation of chaos in space. We mainly present results for a
$(1+1)$-dimensional example, and discuss the general case near the end.Comment: 1+37 pages, published versio
Holographic Floquet states: (I) A strongly coupled Weyl semimetal

Floquet states can be realized in quantum systems driven by continuous
time-periodic perturbations. It is known that a state known as the Floquet Weyl
semimetal can be realized when free Dirac fermions are placed in a rotating
electric field. What will happen if strong interaction is introduced to this
system? Will the interaction wash out the characteristic features of Weyl
semimetals such as the Hall response? Is there a steady state and what is its
thermodynamic behavior? We answer these questions using AdS/CFT correspondence
in the $\mathcal{N}=2$ supersymmetric massless QCD in a rotating electric field
in the large $N_c$ limit realizing the first example of a "holographic Floquet
state". In this limit, gluons not only mediate interaction, but also act as an
energy reservoir and stabilize the nonequilibrium steady state (NESS). We
obtain the electric current induced by a rotating electric field: In the high
frequency region, the Ohm's law is satisfied, while we recover the DC nonlinear
conductivity at low frequency, which was obtained holographically in a previous
work. The thermodynamic properties of the NESS, e.g., fluctuation-dissipation
relation, is characterized by the effective Hawking temperature that is defined
from the effective horizon giving a holographic meaning to the "periodic
thermodynamic" concept. In addition to the strong (pump) rotating electric
field, we apply an additional weak (probe) electric field in the spirit of the
pump-probe experiments done in condensed matter experiments. Weak DC and AC
probe analysis in the background rotating electric field shows Hall currents as
a linear response, therefore the Hall response of Floquet Weyl semimetals
survives at the strong coupling limit. We also find frequency mixed response
currents, i.e., a heterodyning effect, characteristic to periodically driven
Floquet systems.Comment: 30 pages, 12 figure
Measuring the CP property of Higgs coupling to tau leptons in the VBF
  channel at the LHC

We study the prospects of measuring the CP property of the Higgs ($h$)
coupling to tau leptons using the vector boson fusion (VBF) production mode at
the high-luminosity LHC. Utilizing the previously proposed angle between the
planes spanned by the momentum vectors of the $(\pi^+\pi^0)$ and $(\pi^-
\pi^0)$ pairs originating in $\tau^\pm$ decays as the CP-odd observable, we
perform a detailed Monte Carlo analysis, taking into account the relevant
standard model backgrounds, as well as detector resolution effects. We find
that excluding a pure CP-odd coupling hypothesis requires $\mathcal{O}(400
{~\rm fb}^{-1})$ luminosity at the 14 TeV LHC, and values of the CP-mixing
angle larger than about $25^\circ$ can be excluded at $95\%$ confidence level
using $3 {~\rm ab}^{-1}$ data. It is observed that the uncertainty in the
angular resolution of the neutral pion momenta does not constitute a
significant hurdle. Achieving a signal to background ratio ($S/B$) close to
one, while keeping a high enough signal yield required to study the angular
distributions selects out VBF as a promising mode to probe the CP nature of the
$h\tau\tau$ coupling, with gluon fusion suffering from a low $S/B$, and the
$W^\pm h/Zh$ mode (with leptonically decaying $W^\pm /Z$) having a much smaller
signal rate.Comment: 19 pages, 5 figures, 2 table
Vector models and generalized SYK models

We consider the relation between SYK-like models and vector models by
studying a toy model where a tensor field is coupled with a vector field. By
integrating out the tensor field, the toy model reduces to the Gross-Neveu
model in 1 dimension. On the other hand, a certain perturbation can be turned
on and the toy model flows to an SYK-like model at low energy. A
chaotic-nonchaotic phase transition occurs as the sign of the perturbation is
altered. We further study similar models that possess chaos and enhanced
reparameterization symmetries.Comment: 36 pages, 12 figure