pinecone/core-2020-05-10-deduplication huggingface dataset:
Backreaction Issues in Axion Monodromy and Minkowski 4-forms

We clarify the differences between the usual Kaloper-Sorbo description of
axion monodromy and the effective axionic potential in terms of Minkowski
4-forms derived in string compactifications. The fact that the metric of the
3-form fields coming from string theory is field dependent (unlike in
Kaloper-Sorbo) leads to the backreaction issues recently studied in axion
monodromy models within string theory. We reanalyse these problems in terms of
the 4-forms focusing on the case in which the non-periodic scalars backreact on
the Kahler metric of the inflaton reducing the physical field range. In the
closed string sector of Type II Calabi-Yau compactifications with fluxes the
metric becomes field dependent precisely when $\Delta\phi\sim M_p$,
independently of the choice of fluxes. We propose, however, some
counter-examples to this universal behaviour by including open string fields.Comment: 31 pages, 1 figure, v2: typos corrected, comments and references
  adde
Geodesic Diagrams, Gravitational Interactions & OPE Structures

We give a systematic procedure to evaluate conformal partial waves involving
symmetric tensors for an arbitrary CFT$_d$ using geodesic Witten diagrams in
AdS$_{d+1}$. Using this procedure we discuss how to draw a line between the
tensor structures in the CFT and cubic interactions in AdS. We contrast this
map to known results using three-point Witten diagrams: the maps obtained via
volume versus geodesic integrals differ. Despite these differences, we show how
to decompose four-point exchange Witten diagrams in terms of geodesic diagrams,
and we discuss the product expansion of local bulk fields in AdS.Comment: typos corrected, references adde
Spinning Witten Diagrams

We develop a systematic framework to compute the conformal partial wave
expansions (CPWEs) of tree-level four-point Witten diagrams with totally
symmetric external fields of arbitrary mass and integer spin in AdS$_{d+1}$.
Employing this framework, we determine the CPWE of a generic exchange Witten
diagram with spinning exchanged field. As an intermediate step, we diagonalise
the linear map between spinning three-point conformal structures and spinning
cubic couplings in AdS. As a concrete application, we compute all exchange
diagrams in the type A higher-spin gauge theory on AdS$_{d+1}$, which is
conjectured to be dual to the free scalar $O\left(N\right)$ model. Given a
CFT$_d$, our results provide the complete holographic reconstruction of all
cubic couplings involving totally symmetric fields in the putative dual theory
on AdS$_{d+1}$.Comment: 41 pages, many figures. v2: Three self-contained pages removed from
  section 4, to be restored elsewhere. Main results unaffected. Refs added and
  typos fixe
Superparticle phenomenology from the natural mini-landscape

The methodology of the heterotic mini-landscape attempts to zero in on
phenomenologically viable corners of the string landscape where the effective
low energy theory is the Minimal Supersymmetric Standard Model with localized
grand unification. The gaugino mass pattern is that of mirage-mediation. The
magnitudes of various SM Yukawa couplings point to a picture where scalar soft
SUSY breaking terms are related to the geography of fields in the compactified
dimensions. Higgs fields and third generation scalars extend to the bulk and
occur in split multiplets with TeV scale soft masses. First and second
generation scalars, localized at orbifold fixed points or tori with enhanced
symmetry, occur in complete GUT multiplets and have much larger masses. This
picture can be matched onto the parameter space of generalized mirage
mediation. Naturalness considerations, the requirement of the observed
electroweak symmetry breaking pattern, and LHC bounds on m(gluino) together
limit the gravitino mass to the m_{3/2}~ 5-60 TeV range. The mirage unification
scale is bounded from below with the limit depending on the ratio of squark to
gravitino masses. We show that while natural SUSY in this realization may
escape detection even at the high luminosity LHC, the high energy LHC with
\sqrt{s}=33 TeV could unequivocally confirm or exclude this scenario. It should
be possible to detect the expected light higgsinos at the ILC if these are
kinematically accessible, and possibly also discriminate the expected
compression of gaugino masses in the natural mini-landscape picture from the
mass pattern expected in models with gaugino mass unification. The thermal WIMP
signal should be accessible via direct detection searches at the multi-ton
noble liquid detectors such as Xenon-nT or LZ.Comment: 33 pages with 32 .png figure
Vacuum structure of bifundamental gauge theories at finite topological
  angles

We discuss possible vacuum structures of $SU(n)\times SU(n)$ gauge theories
with bifundamental matters at finite $\theta$ angles. In order to give a
precise constraint, a mixed 't Hooft anomaly is studied in detail by gauging
the center $\mathbb{Z}_n$ one-form symmetry of the bifundamental gauge theory.
We propose phase diagrams that are consistent with the constraints, and also
give a heuristic explanation of the result based on the dual superconductor
scenario of confinement.Comment: 28 pages, 6 figures; (v2) references adde
Precision Corrections to Fine Tuning in SUSY

Requiring that the contributions of supersymmetric particles to the Higgs
mass are not highly tuned places upper limits on the masses of superpartners --
in particular the higgsino, stop, and gluino. We revisit the details of the
tuning calculation and introduce a number of improvements, including RGE
resummation, two-loop effects, a proper treatment of UV vs. IR masses, and
threshold corrections. This improved calculation more accurately connects the
tuning measure with the physical masses of the superpartners at LHC-accessible
energies. After these refinements, the tuning bound on the stop is now also
sensitive to the masses of the 1st and 2nd generation squarks, which limits how
far these can be decoupled in Effective SUSY scenarios. We find that, for a
fixed level of tuning, our bounds can allow for heavier gluinos and stops than
previously considered. Despite this, the natural region of supersymmetry is
under pressure from the LHC constraints, with high messenger scales
particularly disfavored.Comment: 26 pages, 8 figure
Second order higher-derivative corrections in Double Field Theory

HSZ Double Field Theory is a higher-derivative theory of gravity with exact
and manifest T-duality symmetry. The first order corrections in the massless
sector were shown to be governed solely by Chern-Simons deformations of the
three-form field strength. We compute the full action with up to six
derivatives ${\cal O} (\alpha'{}^2)$ for the universal sector containing the
metric, two-form and dilaton fields. The Green-Schwarz transformation of the
two-form field remains uncorrected to second order. In addition to the expected
Chern-Simons-squared and Riemann-cubed terms the theory contains a cubic
Gauss-Bonnet interaction, plus other six-derivative unambiguous terms involving
the three-form field strength whose presence indicates that the theory must
contain further higher-derivative corrections.Comment: 40 pages, v2: References added, action with vanishing dilaton
  simplifie
Interpreting the 3 TeV $WH$ Resonance as a $W'$ boson

Motivated by a local $3.2-3.4$ sigma resonance in $WH$ and $ZH$ in the ATLAS
Run 2 data, we attempt to interpret the excess in terms of a $W'$ boson in a
$SU(2)_1 \times SU(2)_2 \times U(1)_X$ model. We stretch the deviation from the
alignment limit of the Equivalence Theorem, so as to maximize $WH$ production
while keeping the $WZ$ production rate below the experimental limit. We found a
viable though small region of parameter space that satisfies all existing
constraints on $W' \to jj, t \bar b, WZ$, as well as the precision Higgs data.
The cross section of $W' \to WH$ that we obtain is about $5-6$ fb.Comment: 14 pages, 2 figure
Noncommutative duality and fermionic quasinormal modes of the BTZ black
  hole

We analyze the fermionic quasinormal modes of the BTZ black hole in the
presence of space-time noncommutativity. Our analysis exploits a duality
between a spinless and spinning BTZ black hole, the spin being proportional to
the noncommutative deformation parameter. Using the AdS/CFT correspondence we
show that the horizon temperatures obtained from the dual CFT pick up
noncommutative contributions. We demonstrate the equivalence between the
quasinormal and non-quasinormal modes for the noncommutative fermionic probes,
which provides further evidence of holography in the noncommutative setting.
Finally we present an analysis of the emission of Dirac fermions and the
corresponding tunneling amplitude within this noncommutative framework.Comment: 17 pages, 1 figure, minor corrections, published in JHE
Sneutrino driven GUT Inflation in Supergravity

In this paper, we embed the model of flipped GUT sneutrino inflation -in a
flipped SU(5) or SO(10) set up- developed by Ellis et al. in a supergravity
framework. The GUT symmetry is broken by a waterfall which could happen at
early or late stage of the inflationary period. The full field dynamics is thus
studied in detail and these two main inflationary configurations are exposed,
whose cosmological predictions are both in agreement with recent astrophysical
measurements. The model has an interesting feature where the inflaton has
natural decay channels to the MSSM particles allowed by the GUT gauge symmetry.
Hence it can account for the reheating after the inflationary epoch.Comment: 17 pages, 2 tables, 3 figures, sections added, typos correcte
High scale flavor alignment in two-Higgs doublet models and its
  phenomenology

The most general two-Higgs doublet model (2HDM) includes potentially large
sources of flavor changing neutral currents (FCNCs) that must be suppressed in
order to achieve a phenomenologically viable model. The flavor alignment ansatz
postulates that all Yukawa coupling matrices are diagonal when expressed in the
basis of mass-eigenstate fermion fields, in which case tree-level Higgs
mediated FCNCs are eliminated. In this work, we explore models with the flavor
alignment condition imposed at a very high energy scale, which results in the
generation of Higgs-mediated FCNCs via renormalization group running from the
high energy scale to the electroweak scale. Using the current experimental
bounds on flavor changing observables, constraints are derived on the aligned
2HDM parameter space. In the favored parameter region, we analyze the
implications for Higgs boson phenomenology.Comment: Explanations added. It matches the version published in JHE
Supersymmetric SYK model and random matrix theory

In this paper, we investigate the effect of supersymmetry on the symmetry
classification of random matrix theory ensembles. We mainly consider the random
matrix behaviors in the $\mathcal{N}=1$ supersymmetric generalization of
Sachdev-Ye-Kitaev (SYK) model, a toy model for two-dimensional quantum black
hole with supersymmetric constraint. Some analytical arguments and numerical
results are given to show that the statistics of the supersymmetric SYK model
could be interpreted as random matrix theory ensembles, with a different
eight-fold classification from the original SYK model and some new features.
The time-dependent evolution of the spectral form factor is also investigated,
where predictions from random matrix theory are governing the late time
behavior of the chaotic hamiltonian with supersymmetry.Comment: Published versio
The seesaw portal in testable models of neutrino masses

A Standard Model extension with two Majorana neutrinos can explain the
measured neutrino masses and mixings, and also account for the
matter-antimatter asymmetry in a region of parameter space that could be
testable in future experiments. The testability of the model relies to some
extent on its minimality. In this paper we address the possibility that the
model might be extended by extra generic new physics which we parametrize in
terms of a low-energy effective theory. We consider the effects of the
operators of the lowest dimensionality, $d=5$, and evaluate the upper bounds on
the coefficients so that the predictions of the minimal model are robust. One
of the operators gives a new production mechanism for the heavy neutrinos at
LHC via higgs decays. The higgs can decay to a pair of such neutrinos that,
being long-lived, leave a powerful signal of two displaced vertices. We
estimate the LHC reach to this process.Comment: 19 pages, 11 figure
Soft Theorems in Superstring Theory

We use insights from superstring field theory to prove the subleading soft
graviton theorem for tree amplitudes of (compactified) heterotic and type II
string theories for arbitrary number of finite energy NS (NSNS) sector external
states but only one soft graviton. We also prove the leading soft graviton
theorem in these theories for arbitrary number of external soft gravitons. In
our analysis there is no restriction on the mass and spin of the finite energy
external states. This method can also be used to give a proof of the subleading
soft graviton theorem for tree amplitudes in quantum field theories coupled to
gravity with generic interactions. We discuss the technical issue involved in
extending this analysis to loop amplitudes of superstring theory including
Ramond sector external states, and its possible resolution.Comment: LaTex file, 21 pages; v2: references updated, other minor changes;
  v3: minor clarifications adde
Cuts from residues: the one-loop case

Using the multivariate residue calculus of Leray, we give a precise
definition of the notion of a cut Feynman integral in dimensional
regularization, as a residue evaluated on the variety where some of the
propagators are put on shell. These are naturally associated to Landau
singularities of the first type. Focusing on the one-loop case, we give an
explicit parametrization to compute such cut integrals, with which we study
some of their properties and list explicit results for maximal and
next-to-maximal cuts. By analyzing homology groups, we show that cut integrals
associated to Landau singularities of the second type are specific combinations
of the usual cut integrals, and we obtain linear relations among different cuts
of the same integral. We also show that all one-loop Feynman integrals and
their cuts belong to the same class of functions, which can be written as
parametric integrals.Comment: v2: fixed minor typos in the normalisation of cut integral
Ward identities and combinatorics of rainbow tensor models

We discuss the notion of renormalization group (RG) completion of
non-Gaussian Lagrangians and its treatment within the framework of
Bogoliubov-Zimmermann theory in application to the matrix and tensor models.
With the example of the simplest non-trivial RGB tensor theory (Aristotelian
rainbow), we introduce a few methods, which allow one to connect calculations
in the tensor models to those in the matrix models. As a byproduct, we obtain
some new factorization formulas and sum rules for the Gaussian correlators in
the Hermitian and complex matrix theories, square and rectangular. These sum
rules describe correlators as solutions to finite linear systems, which are
much simpler than the bilinear Hirota equations and the infinite Virasoro
recursion. Search for such relations can be a way to solving the tensor models,
where an explicit integrability is still obscure.Comment: 48 page
Quarter-BPS states in orbifold sigma models with ADE singularities

We study the elliptic genera of two-dimensional orbifold CFTs, where the
orbifolding procedure introduces du Val surface singularities on the target
space. The N=4 character decompositions of the elliptic genus contributions
from the twisted sectors at the singularities obey a consistent scaling
property, and contain information about the arrangement of exceptional rational
curves in the resolution. We also discuss how these twisted sector elliptic
genera are related to twining genera and Hodge elliptic genera for sigma models
with K3 target space.Comment: 13 pages + appendix. v2: minor changes, including additional
  reference
A conformal block Farey tail

We investigate the constraints of crossing symmetry on CFT correlation
functions. Four point conformal blocks are naturally viewed as functions on the
upper-half plane, on which crossing symmetry acts by PSL(2,Z) modular
transformations. This allows us to construct a unique, crossing symmetric
function out of a given conformal block by averaging over PSL(2,Z). In some two
dimensional CFTs the correlation functions are precisely equal to the modular
average of the contributions of a finite number of light states. For example,
in the two dimensional Ising and tri-critical Ising model CFTs, the correlation
functions of identical operators are equal to the PSL(2,Z) average of the
Virasoro vacuum block; this determines the 3 point function coefficients
uniquely in terms of the central charge. The sum over PSL(2,Z) in CFT2 has a
natural AdS3 interpretation as a sum over semi-classical saddle points, which
describe particles propagating along rational tangles in the bulk. We
demonstrate this explicitly for the correlation function of certain heavy
operators, where we compute holographically the semi-classical conformal block
with a heavy internal operator.Comment: 52 pages, 6 figures; v2: Minor corrections, addition of fig 6 and
  JHEP versio
Tensor networks for dynamic spacetimes

Existing tensor network models of holography are limited to representing the
geometry of constant time slices of static spacetimes. We study the possibility
of describing the geometry of a dynamic spacetime using tensor networks. We
find it is necessary to give a new definition of length in the network and
propose a definition based on the mutual information. We show that by
associating a set of networks with a single quantum state and making use of the
mutual information based definition of length, a network analogue of the
maximin formula can be used to calculate the entropy of boundary regions
Closing the window for compressed Dark Sectors with disappearing charged
  tracks

We investigate the sensitivity at current and future hadron colliders to a
heavy electrically-charged particle with a proper decay length below a
centimetre, whose decay products are invisible due to below-threshold energies
and/or small couplings to the Standard Model. A cosmologically-motivated
example of a framework that contains such a particle is the Minimal
Supersymmetric Standard Model in the limit of pure Higgsinos. The current
hadron-collider search strategy has no sensitivity to the upper range of pure
Higgsino masses that are consistent with the thermal relic density, even at a
future collider with 100 TeV centre-of-mass energy. We show that performing a
disappearing track search within the inner 10 cm of detector volume would
improve the reach in lifetime by a factor of 3 at the 14 TeV LHC and a further
factor of 5 at a 100 TeV collider, resulting in around 10 events for 1.1 TeV
thermal Higgsinos. In order to include the particles with the largest boost in
the analysis, we furthermore propose a purely track-based search in both the
central and forward regions, each of which would increase the number of events
by another factor of 5, improving our reach at small lifetimes. This would
allow us to definitively discover or exclude the experimentally-elusive
pure-Higgsino thermal relic at a 100 TeV collider.Comment: 20 pages, 11 figure
Local bulk physics from intersecting modular Hamiltonians

We show that bulk quantities localized on a minimal surface homologous to a
boundary region correspond in the CFT to operators that commute with the
modular Hamiltonian associated with the boundary region. If two such minimal
surfaces intersect at a point in the bulk then CFT operators which commute with
both extended modular Hamiltonians must be localized at the intersection point.
We use this to construct local bulk operators purely from CFT considerations,
without knowing the bulk metric, using intersecting modular Hamiltonians. For
conformal field theories at zero and finite temperature the appropriate modular
Hamiltonians are known explicitly and we recover known expressions for local
bulk observables.Comment: 28 pages, LaTeX. v2: additional discussion of extended modular
  Hamiltonian. v3: version to appear in JHE
Differential equations on unitarity cut surfaces

We reformulate differential equations (DEs) for Feynman integrals to avoid
doubled propagators in intermediate steps. External momentum derivatives are
dressed with loop momentum derivatives to form tangent vectors to unitarity cut
surfaces, in a way inspired by unitarity-compatible IBP reduction. For the
one-loop box, our method directly produces the final DEs without any
integration-by-parts reduction. We further illustrate the method by deriving
maximal-cut level differential equations for two-loop nonplanar five-point
integrals, whose exact expressions are yet unknown. We speed up the computation
using finite field techniques and rational function reconstruction.Comment: 17 pages, 3 figures; v2: added more results and references, final
  journal versio
LHC phenomenology and baryogenesis in supersymmetric models with a
  $U(1)_R$ baryon number

We study the phenomenology of a supersymmetric extension of the Standard
Model with an $R$-symmetry under which $R$-charges correspond to the baryon
number. This identification allows for the presence in the superpotential of
the $R$-parity violating term $\lambda''U^c D^c D^c$ without breaking baryon
number, which loosens several bounds on this operator while changing
considerably the phenomenology. However, the $R$-symmetry cannot remain exact
as it is at least broken by anomaly mediation. Under these conditions, we
investigate the constraints coming from baryon number violating processes and
flavour physics and find that, in general, they are lessened. Additionally, we
examine recent ATLAS and CMS experimental searches and use these to place
limits on the parameter space of the model. This is done for both stop
production, which now features both pair and resonant production, and pair
production of the first two generations of squarks. Finally, we study the
implications this model has on baryogenesis. We find that successful
baryogenesis can potentially be achieved, but only at the cost of breaking the
$R$-symmetry by a significant amount.Comment: 48 pages, 25 figures, references adde
Higher Derivative Field Theories: Degeneracy Conditions and Classes

We provide a full analysis of ghost free higher derivative field theories
with coupled degrees of freedom. Assuming the absence of gauge symmetries, we
derive the degeneracy conditions in order to evade the Ostrogradsky ghosts, and
analyze which (non)trivial classes of solutions this allows for. It is shown
explicitly how Lorentz invariance avoids the propagation of "half" degrees of
freedom. Moreover, for a large class of theories, we construct the field
redefinitions and/or (extended) contact transformations that put the theory in
a manifestly first order form. Finally, we identify which class of theories
cannot be brought to first order form by such transformations.Comment: 26 pages, 1 figure. v2: minor changes, references added, matches
  version published in JHE
High energy behaviour of form factors

We solve renormalization group equations that govern infrared divergences of
massless and massive form factors. By comparing to recent results for planar
massive three-loop and massless four-loop form factors in QCD, we give
predictions for the high-energy limit of massive form factors at the four- and
for the massless form factor at five-loop order. Furthermore, we discuss the
relation which connects infrared divergences regularized dimensionally and via
a small quark mass and extend results present in the literature to higher
order.Comment: 21 page