pinecone/core-2020-05-10-deduplication huggingface dataset:
SO(10) as a Framework for Natural Supersymmetry

We consider an SO(10) grand unified theory in which the ratio of the SU(2)_W
and SU(3)_c gaugino masses satisfy M_2/M_3 \approx 3, which results in the
realization of natural supersymmetry. In the MSSM parameter space this relation
looks artificial, but in the SO(10) case it results from a field with a
designated vacuum expectation value. We consider two models, namely
M_1:M_2:M_3=-1/5:3:1 (Case I), and M_1:M_2:M_3=-5:3:1 (Case II). Focusing on
ameliorating the little hierarchy problem, we explore the parameter space of
these models which yield small fine-tuning measuring parameters (natural
supersymmetry) at the electroweak scale (\Delta_{EW}) as well as at the high
scale (\Delta_{HS}). Although both models allow for the solution of the little
hierarchy problem, the predicted sparticle spectra can differ markedly in the
two cases. Depending on the ratio of the bino mass to the other gaugino masses,
Case I leads to stau lepton masses of around a 100 GeV, while in Case II, the
stau slepton masses are in the several TeV range. In Case I, the bino-like
neutralino can be as light as 90 GeV, while the gluino is heavier than 2 TeV or
so. In Case II, due to gluino-bino near degeneracy, the bino cannot be lighter
than a TeV or so. Having a light neutralino with sizable bino-higgsino mixture
in Case I allows the direct dark matter search experiments to test this class
of models.Comment: 22 pages, 9 figures, 2 tables. arXiv admin note: text overlap with
  arXiv:1212.2593, arXiv:1303.696
Bremsstrahlung and black hole production from collisions of
  ultra-boosted particles at non-zero impact parameter

The collision of two massless, gravitationally interacting, point-like
massless particles, boosted to the speed of light, colliding with an impact
parameter b is being investigated. The collision takes place in four space-time
flat dimensional background. A perturbative scheme is employed and the
corrections to the energy momentum tensor and to the metric are computed and
closed form formulas are provided. This includes the back-reaction on the
metric after the collision. Including such corrections suggests that the
tracelessness of the initial stress tensors of the colliding particles is
preserved during and after the collision. The necessity for introducing an
impact parameter in the perturbative treatment is highlighted and the breaking
of the underlying perturbative approach at b = 0 is motivated. In addition, the
energy radiated in the form of gravitational bremsstrahlung radiation is
discussed while an example from gravitational-waves collision is being studied.Comment: 16 pages, 7 figure
Remnants, fermions' tunnelling and effects of quantum gravity

The remnants are investigated by fermions' tunnelling from a 4-dimensional
charged dilatonic black hole and a 5-dimensional black string. Based on the
generalized uncertainty principle, effects of quantum gravity are taken into
account. The quantum numbers of the emitted fermions affects the Hawking
temperatures. For the black hole, the quantum gravity correction slows down the
increase of the temperature, which leads to the remnant left in the
evaporation. For the black string, the existence of the remnant is determined
by the quantum gravity correction and effects of the extra compact dimension.Comment: 15 page
Parity odd equilibrium partition function in 2+1 dimensions

We use Schwinger's proper time method to compute the parity odd contributions
to the U(1) current and energy-momentum tensor of an ideal gas of fermions in
2+1 dimensions in the presence of static gauge and gravitational backgrounds.
From these results the equilibrium partition function at first order in the
derivative expansion is explicitly obtained by integration. The form of the
computed partition function is consistent with general arguments based on
Kaluza-Klein and gauge invariance.Comment: 16 pages. 1 reference added, typo in Eq. (3.34) corrected. Matches
  journal versio
Stability, Tunneling and Flux Changing de Sitter Transitions in the
  Large Volume String Scenario

We study the non-perturbative stability of the Large Volume Scenario (LVS) of
IIB string compactifications, by analysing transitions mediated by the
Brown-Teitelboim (BT) brane nucleations and by Coleman De Luccia tunneling
(CDL). We find that, as long as the effective field theory description holds,
the LVS AdS minima are stable despite being non-supersymmetric. This opens the
possibility of having a CFT dual. Metastable de Sitter vacua behave differently
depending on the uplifting mechanism. We find explicit expressions for the
different decay rates in terms of exponentials of the volume. Among the
transitions of dS to dS those with increasing volume and decreasing vacuum
energy are preferred, though dS decays to AdS (big-crunch sinks) have higher
probability. However, the probability of transitions via the CDL mechanism to
decompactification are exponentially much larger compared to these. The BT
decays correspond to flux/D3 brane transitions mediated by the nucleation of
D5/NS5 branes. We compare our results with previous analysis for KKLT, type
IIA, and 6D Einstein-Maxwell studies. In particular we find no indication for a
bubble of nothing decay.Comment: An error (equation 5.5) is corrected and references added. The main
  conclusion is unchange
Constraints on CP-violating Higgs couplings to the third generation

Discovering CP-violating effects in the Higgs sector would constitute an
indisputable sign of physics beyond the Standard Model. We derive constraints
on the CP-violating Higgs-boson couplings to top and bottom quarks as well as
to tau leptons from low-energy bounds on electric dipole moments, resumming
large logarithms when necessary. The present and future projections of the
sensitivities and comparisons with the LHC constraints are provided.
Non-trivial constraints are possible in the future, even if the Higgs boson
only couples to the third-generation fermions.Comment: 26 pages, 10 figures; typos corrected, version as published in JHE
A new diagrammatic representation for correlation functions in the in-in formalism

In this paper we provide an alternative method to compute correlation functions in the in-in formalism. We develop a modified set of Feynman rules that allows for an easier computation of loop corrections. With respect to the standard in-in formalism (where the diagrammatic representation is very compact but the evaluation of each diagram is rather involved and contains many different contributions), in our formulation the major effort is devoted to drawing the diagrams, while their mathematical interpretation is straightforward. Our method is particularly suitable for applications to cosmology
Double Trace Flows and Holographic RG in dS/CFT correspondence

If there is a dS/CFT correspondence, time evolution in the bulk should
translate to RG flows in the dual euclidean field theory. Consequently,
although the dual field is expected to be non-unitary, its RG flows will carry
an imprint of the unitary time evolution in the bulk. In this note we examine
the prediction of holographic RG in de Sitter space for the flow of double and
triple trace couplings in any proposed dual. We show quite generally that the
correct form of the field theory beta functions for the double trace couplings
is obtained from holography, provided one identifies the scale of the field
theory with (i|T|) where T is the `time' in conformal coordinates. For dS(4),
we find that with an appropriate choice of operator normalization, it is
possible to have real n-point correlation functions as well as beta functions
with real coefficients. This choice leads to an RG flow with an IR fixed point
at negative coupling unlike in a unitary theory where the IR fixed point is at
positive coupling. The proposed correspondence of Sp(N) vector models with de
Sitter Vasiliev gravity provides a specific example of such a phenomenon. For
dS(d+1) with even d, however, we find that no choice of operator normalization
exists which ensures reality of coefficients of the beta-functions as well as
absence of n-dependent phases for various n-point functions, as long as one
assumes real coupling constants in the bulk Lagrangian.Comment: 18 pages, no figures; (v2) minor typos fixed, references adde
Neutrino Mixing and Masses from a Minimum Principle

We analyze the structure of quark and lepton mass matrices under the
hypothesis that they are determined from a minimum principle applied to a
generic potential invariant under the $\left[SU(3)\right]^5\otimes \mathcal
O(3)$ flavor symmetry, acting on Standard Model fermions and right-handed
neutrinos. Unlike the quark case, we show that hierarchical masses for charged
leptons are naturally accompanied by degenerate Majorana neutrinos with one
mixing angle close to maximal, a second potentially large, a third one
necessarily small, and one maximal relative Majorana phase. Adding small
perturbations the predicted structure for the neutrino mass matrix is in
excellent agreement with present observations and could be tested in the near
future via neutrino-less double beta decay and cosmological measurements. The
generalization of these results to arbitrary sew-saw models is also discussed.Comment: Journal version; corrections on the discussion of one of the Majorana
  phases and other precisions adde
Constraining Higgs mediated dark matter interactions

We perform an analysis of Higgs portal models of dark matter (DM), where DM
is light enough to contribute to invisible Higgs decays. Using effective field
theory we show that DM can be a thermal relic only if there are additional
light particles present with masses below a few 100 GeV. We give three concrete
examples of viable Higgs portal models of light DM: (i) the SM extended by DM
scalar along with an electroweak triplet and a singlet, (ii) a Two Higgs
Doublet Model of type II with additional scalar DM, (iii) SM with DM and an
extra scalar singlet that is lighter than DM. In all three examples the Br(h to
invisible) constraint is not too restrictive, because it is governed by
different parameters than the relic abundance. Additional light particles can
have implications for flavor violation and collider searches.Comment: 31 pages, 9 figures; version as publishe
Light-Cone Distribution Amplitudes for Heavy-Quark Hadrons

We construct parametrizations of light-cone distribution amplitudes (LCDAs)
for B-mesons and Lambda_b-baryons that obey various theoretical constraints,
and which are simple to use in factorization theorems relevant for
phenomenological applications in heavy-flavour physics. In particular, we find
the eigenfunctions of the Lange-Neubert renormalization kernel, which allow for
a systematic implementation of renormalization-group evolution effects for both
B-meson and \Lambda_b-baryon decays. We also present a new strategy to
construct LCDA models from momentum-space projectors, which can be used to
implement Wandzura-Wilczek--like relations, and which allow for a comparison
with theoretical approaches that go beyond the collinear limit for the
light-quark momenta in energetic heavy-hadron decays.Comment: 39 pages, 11 figure
On classical q-deformations of integrable sigma-models

JHEP is an open-access journal funded by SCOAP3 and licensed under CC BY 4.0A procedure is developed for constructing deformations of integrable ??-models which are themselves classically integrable. When applied to the principal chiral model on any compact Lie group F, one recovers the Yang-Baxter ??-model introduced a few years ago by C. Klim????k. In the case of the symmetric space ??-model on F/G we obtain a new one-parameter family of integrable ??-models. The actions of these models correspond to a deformation of the target space geometry and include a torsion term. An interesting feature of the construction is the q-deformation of the symmetry corresponding to left multiplication in the original models, which becomes replaced by a classical q-deformed Poisson-Hopf algebra. Another noteworthy aspect of the deformation in the coset ??-model case is that it interpolates between a compact and a non-compact symmetric space. This is exemplified in the case of the SU(2)/U(1) coset ??-model which interpolates all the way to the SU(1, 1)/U(1) coset ??-mode
Constraining Light Dark Matter with Diffuse X-Ray and Gamma-Ray
  Observations

We present constraints on decaying and annihilating dark matter (DM) in the 4
keV to 10 GeV mass range, using published results from the satellites HEAO-1,
INTEGRAL, COMPTEL, EGRET, and the Fermi Gamma-ray Space Telescope. We derive
analytic expressions for the gamma-ray spectra from various DM decay modes, and
find lifetime constraints in the range 10^24-10^28 sec, depending on the DM
mass and decay mode. We map these constraints onto the parameter space for a
variety of models, including a hidden photino that is part of a kinetically
mixed hidden sector, a gravitino with R-parity violating decays, a sterile
neutrino, DM with a dipole moment, and a dark pion. The indirect constraints on
sterile-neutrino and hidden-photino DM are found to be more powerful than other
experimental or astrophysical probes in some parts of parameter space. While
our focus is on decaying DM, we also present constraints on DM annihilation to
electron-positron pairs. We find that if the annihilation is p-wave suppressed,
the galactic diffuse constraints are, depending on the DM mass and velocity at
recombination, more powerful than the constraints from the Cosmic Microwave
Background.Comment: 35 pages, 15 figures; matches journal versio
Consequences of Weyl Consistency Conditions

The running of quantum field theories can be studied in detail with the use
of a local renormalization group equation. The usual beta-function effects are
easy to include, but by introducing spacetime-dependence of the various
parameters of the theory one can efficiently incorporate renormalization
effects of composite operators as well. An illustration of the power of these
methods was presented by Osborn in the early 90s, who used consistency
conditions following from the Abelian nature of the Weyl group to rederive
Zamolodchikov's c-theorem in d=2 spacetime dimensions, and also to obtain a
perturbative a-theorem in d=4. In this work we present an extension of Osborn's
work to d=6 and to general even d. We compute the full set of Weyl consistency
conditions, and we discover among them a candidate for an a-theorem in d=6,
similar to the d=2,4 cases studied by Osborn. Additionally, we show that in any
even spacetime dimension one finds a consistency condition that may serve as a
generalization of the c-theorem, and that the associated candidate c-function
involves the coefficient of the Euler term in the trace anomaly. Such a
generalization hinges on proving the positivity of a certain "metric" in the
space of couplings.Comment: 19 pages, Mathematica file with consistency conditions included in
  submission. v2: Fixed typo
Conformal couplings of Galileons to other degrees of freedom

We discuss a formulation of Galileon actions in terms of matrix determinants
in four dimensions. This approach allows one to straightforwardly determine
derivative couplings between Galileons and scalar or vector degrees of freedom
that lead to equations of motion with at most two space-time derivatives. We
use this method to easily build generalizations of Galileon set-ups preserving
conformal symmetry, finding explicit examples of couplings between Galileons
and additional degrees of freedom that preserve the Galileon conformal
invariance. We discuss various physical applications of our method and of our
results.Comment: 11 pages, no figures. v2: JHEP versio
Interacting fermions and N=2 Chern-Simons-matter theories

The partition function on the three-sphere of N=3 Chern-Simons-matter
theories can be formulated in terms of an ideal Fermi gas. In this paper we
show that, in theories with N=2 supersymmetry, the partition function
corresponds to a gas of interacting fermions in one dimension. The large N
limit is the thermodynamic limit of the gas and it can be analyzed with the
Hartree and Thomas-Fermi approximations, which lead to the known large N
solutions of these models. We use this interacting fermion picture to analyze
in detail N=2 theories with one single node. In the case of theories with no
long-range forces we incorporate exchange effects and argue that the partition
function is given by an Airy function, as in N=3 theories. For the theory with
g adjoint superfields and long-range forces, the Thomas-Fermi approximation
leads to an integral equation which determines the large N, strongly coupled
R-charge.Comment: 29 pages, 4 figure
Direct test of the AdS/CFT correspondence by Monte Carlo studies of N=4
  super Yang-Mills theory

We perform nonperturbative studies of N=4 super Yang-Mills theory by Monte
Carlo simulation. In particular, we calculate the correlation functions of
chiral primary operators to test the AdS/CFT correspondence. Our results agree
with the predictions obtained from the AdS side that the SUSY
non-renormalization property is obeyed by the three-point functions but
\emph{not} by the four-point functions investigated in this paper. Instead of
the lattice regularization, we use a novel regularization of the theory based
on an equivalence in the large-N limit between the N=4 SU(N) theory on RxS^3
and a one-dimensional SU(N) gauge theory known as the plane-wave (BMN) matrix
model. The equivalence extends the idea of large-N reduction to a curved space
and, at the same time, overcomes the obstacle related to the center symmetry
breaking. The adopted regularization preserves 16 SUSY, which is crucial in
testing the AdS/CFT correspondence with the available computer resources. The
only SUSY breaking effects, which come from the momentum cutoff $\Lambda$ in R
direction, are made negligible by using sufficiently large $\Lambda$.Comment: v1) 39 pages, 12 figures; v2) references added; v3) published version
  with minor correction
Low Energy Probes of PeV Scale Sfermions

We derive bounds on squark and slepton masses in mini-split supersymmetry
scenario using low energy experiments. In this setup gauginos are at the TeV
scale, while sfermions are heavier by a loop factor. We cover the most
sensitive low energy probes including electric dipole moments (EDMs), meson
oscillations and charged lepton flavor violation (LFV) transitions. A leading
log resummation of the large logs of gluino to sfermion mass ratio is
performed. A sensitivity to PeV squark masses is obtained at present from kaon
mixing measurements. A number of observables, including neutron EDMs, mu->e
transitions and charmed meson mixing, will start probing sfermion masses in the
100 TeV-1000 TeV range with the projected improvements in the experimental
sensitivities. We also discuss the implications of our results for a variety of
models that address the flavor hierarchy of quarks and leptons. We find that
EDM searches will be a robust probe of models in which fermion masses are
generated radiatively, while LFV searches remain sensitive to simple-texture
based flavor models.Comment: 49 pages, 17 figures, v4: Eq. (24) and Fig. 11 corrected; conclusions
  unchange
Non-Abelian tensor hierarchy in (1,0) D=6 superspace

We present a set of constraints on superfield strengths of the non-Abelian
p-form potentials in D=6 (1,0) superspace which reproduces, as their
selfconsistency conditions, the equations of motion of the recently proposed
(1,0) superconformal theory. These include the anti-self-duality conditions for
the field strength of the non-Abelian 2-form potential, duality between field
strengths of the non-Abelian vectors and 3-forms as well as of the non-Abelian
four forms and scalar fields.Comment: 1+10 pages, no figures. V2: New section added, discussion extended,
  1+19 pages, to appear in JHE
Selection Rules and RR Couplings on Non-BPS Branes

We compute three and four point functions of the non-BPS scattering
amplitudes, including a closed string Ramond-Ramond, gauge/scalar and tachyon
in type IIA (IIB) superstring theories. We then discover a unique expansion for
tachyon amplitudes in both non-BPS and D-brane anti D-brane formalisms. Based
on remarks on Chan-Paton factors and arXiv:1304.3711, we propose selection
rules for all non-BPS scattering amplitudes of type II superstring theory.
These selection rules, rule out various non-BPS higher point correlation
functions of the string theory.Comment: 27 pages, Latex file, no figure,v2: the title is shortened. To appear
  in JHE
Effective Lagrangian for the Polyakov line on a lattice

We formulate a method for computing the effective Lagrangian of the Polyakov
line on the lattice. Using mean field approximation we calculate the effective
potential for high temperatures. The result agrees with recent lattice
simulations. We reveal a new type of ultraviolet divergence (coming from
longitudinal gluons) which dominates the effective potential and explains the
discrepancy of the lattice simulations and standard perturbative calculations
performed in covariant gauges.Comment: Comments and references added. Version to appear in JHE
Bekenstein-Hawking Entropy as Topological Entanglement Entropy

Black holes in 2+1 dimensions enjoy long range topological interactions
similar to those of non-abelian anyon excitations in a topologically ordered
medium. Using this observation, we compute the topological entanglement entropy
of BTZ black holes, via the established formula S_top = log(S^a_0), with S_b^a
the modular S-matrix of the Virasoro characters chi_a(tau). We find a precise
match with the Bekenstein-Hawking entropy. This result adds a new twist to the
relationship between quantum entanglement and the interior geometry of black
holes. We generalize our result to higher spin black holes, and again find a
detailed match. We comment on a possible alternative interpretation of our
result in terms of boundary entropy.Comment: 15 pages, 3 figures; typos corrected, references adde
Non-universal gaugino masses and fine tuning implications for SUSY
  searches in the MSSM and the GNMSSM

For the case of the MSSM and the most general form of the NMSSM (GNMSSM) we
determine the reduction in the fine tuning that follows from allowing gaugino
masses to be non-degenerate at the unification scale, taking account of the
LHC8 bounds on SUSY masses, the Higgs mass bound, gauge coupling unification
and the requirement of an acceptable dark matter density. We show that low-fine
tuned points fall in the region of gaugino mass ratios predicted by specific
unified and string models. For the case of the MSSM the minimum fine tuning is
still large, approximately 1:60 allowing for a 3 GeV uncertainty in the Higgs
mass (1:500 for the central value), but for the GNMSSM it is below 1:20. We
find that the spectrum of SUSY states corresponding to the low-fine tuned
points in the GNMSSM is often compressed, weakening the LHC bounds on coloured
states. The prospect for testing the remaining low-fine-tuned regions at LHC14
is discussed.Comment: 18 page