pinecone/core-2020-05-10-deduplication huggingface dataset:
Cosmic strings from pseudo-anomalous Fayet-Iliopoulos U(1) in D3/D7
  brane inflation

We examine the consequences of recent developments on Fayet-Iliopoulos (FI)
terms for D-term inflationary models. There is currently no known way to couple
constant FI terms to supergravity consistently; only field-dependent FI terms
are allowed. These are natural in string theory and we argue that the FI term
in D3/D7 inflation turns out to be of this type, corresponding to a
pseudo-anomalous U(1). T he anomaly is canceled by the Green-Schwarz mechanism
in 4 dimensions. Inflation proceeds as usual, except that the scale is set by
the GS parameter. Cosmic strings resulting from a pseudo-anomalous U(1) have
potentially interesting characteristics. Originally expected to be global, they
turn out to be local in the string theory context and can support currents. We
outline the nature of these strings, discuss bounds on their formation, and
summarize resulting cosmological consequences.Comment: 10 pages; minor changes to match published versio
A Comparison of Supersymmetry Breaking and Mediation Mechanisms

We give a unified treatment of different models of supersymmetry breaking and
mediation from a four dimensional effective field theory standpoint. In
particular a comparison between GMSB and various gravity mediated versions of
SUSY breaking shows that, once the former is embedded within a SUGRA framework,
there is no particular advantage to that mechanism from the point of view of
FCNC suppression. We point out the difficulties of all these scenarios - in
particular the cosmological modulus problem. We end with a discussion of
possible string theory realizations.Comment: Added clarifications and references, 20 page
Stop Reconstruction with Tagged Tops

At the LHC combinatorics make it unlikely that we will be able to observe
stop pair production with a decay to a semi-leptonic top pair and missing
energy for generic supersymmetric mass spectra. Using a Standard-Model top
tagger on fully hadronic top decays we can not only extract the stop signal but
also measure the top momentum. To illustrate the promise of tagging tops with
moderate boost we include a detailed discussion of our HEPTopTagger algorithm.Comment: version published by JHEP, contact information for HEPTopTagger
  source code include
Effective Theory Approach to the Spontaneous Breakdown of Lorentz
  Invariance

We generalize the coset construction of Callan, Coleman, Wess and Zumino to
theories in which the Lorentz group is spontaneously broken down to one of its
subgroups. This allows us to write down the most general low-energy effective
Lagrangian in which Lorentz invariance is non-linearly realized, and to explore
the consequences of broken Lorentz symmetry without having to make any
assumptions about the mechanism that triggers the breaking. We carry out the
construction both in flat space, in which the Lorentz group is a global
spacetime symmetry, and in a generally covariant theory, in which the Lorentz
group can be treated as a local internal symmetry. As an illustration of this
formalism, we construct the most general effective field theory in which the
rotation group remains unbroken, and show that the latter is just the
Einstein-aether theory.Comment: 45 pages, no figures
The Top Window for dark matter

We investigate a scenario that the top quark is the only window to the dark
matter particle. We use the effective Lagrangian approach to write down the
interaction between the top quark and the dark matter particle. Requiring the
dark matter satisfying the relic density we obtain the size of the effective
interaction. We show that the scenario can be made consistent with the direct
and indirect detection experiments by adjusting the size of the effective
coupling. Finally, we calculate the production cross section for $t\bar t +
\chi \bar \chi$ at the Large Hadron Collider (LHC), which will give rise to an
interesting signature of a top-pair plus large missing energy.Comment: 17 pages including 8 figures; added references and a footnot
On the spectral problem of N=4 SYM with orthogonal or symplectic gauge
  group

We study the spectral problem of N=4 SYM with gauge group SO(N) and Sp(N). At
the planar level, the difference to the case of gauge group SU(N) is only due
to certain states being projected out, however at the non-planar level novel
effects appear: While 1/N-corrections in the SU(N) case are always associated
with splitting and joining of spin chains, this is not so for SO(N) and Sp(N).
Here the leading 1/N-corrections, which are due to non-orientable Feynman
diagrams in the field theory, originate from a term in the dilatation operator
which acts inside a single spin chain. This makes it possible to test for
integrability of the leading 1/N-corrections by standard (Bethe ansatz) means
and we carry out various such tests. For orthogonal and symplectic gauge group
the dual string theory lives on the orientifold AdS5xRP5. We discuss various
issues related to semi-classical strings on this background.Comment: 25 pages, 3 figures. v2: Minor clarifications, section 5 expande
The real singlet scalar dark matter model

We present an undated comprehensive analysis for the simplest dark matter
model in which a real singlet scalar with a $Z_2$ symmetry is introduced to
extend the standard model. According to the observed dark matter abundance, we
predict the dark matter direct and indirect detection cross sections for the
whole parameter space. The Breit-Wigner resonance effect has been considered to
calculate the thermally averaged annihilation cross section. It is found that
three regions can be excluded by the current direct and indirect dark matter
search experiments. In addition, we also discuss the implication of this model
for the Higgs searches at colliders.Comment: 14 pages, 7 figures. discussion and references added, published in
  JHE
Heterotic horizons, Monge-Ampere equation and del Pezzo surfaces

Heterotic horizons preserving 4 supersymmetries have sections which are T^2
fibrations over 6-dimensional conformally balanced Hermitian manifolds. We give
new examples of horizons with sections S^3 X S^3 X T^2 and SU(3). We then
examine the heterotic horizons which are T^4 fibrations over a Kahler
4-dimensional manifold. We prove that the solutions depend on 6 functions which
are determined by a non-linear differential system of 6 equations that include
the Monge-Ampere equation. We show that this system has an explicit solution
for the Kahler manifold S^2 X S^2. We also demonstrate that there is an
associated cohomological system which has solutions on del Pezzo surfaces. We
raise the question of whether for every solution of the cohomological problem
there is a solution of the differential system, and so a new heterotic horizon.
The horizon sections have topologies which include ((k-1) S^2 X S^4 # k (S^3 X
S^3)) X T^2$ indicating the existence of exotic black holes. We also find an
example of a horizon section which gives rise to two different near horizon
geometries.Comment: 33 pages, latex. Reference adde
Dimension-Six Terms in the Standard Model Lagrangian

When the Standard Model is considered as an effective low-energy theory,
higher dimensional interaction terms appear in the Lagrangian. Dimension-six
terms have been enumerated in the classical article by Buchmueller and Wyler
[3]. Although redundance of some of those operators has been already noted in
the literature, no updated complete list has been published to date. Here we
perform their classification once again from the outset. Assuming baryon number
conservation, we find 15 + 19 + 25 = 59 independent operators (barring flavour
structure and Hermitian conjugations), as compared to 16 + 35 + 29 = 80 in
Ref.[3]. The three summed numbers refer to operators containing 0, 2 and 4
fermion fields. If the assumption of baryon number conservation is relaxed, 4
new operators arise in the four-fermion sector.Comment: 16 pages, no figures, v3: Redundant B-violating operator remove
Minimal Conformal Technicolor and Precision Electroweak Tests

We study the minimal model of conformal technicolor, an SU(2) gauge theory
near a strongly coupled conformal fixed point, with conformal symmetry softly
broken by technifermion mass terms. Conformal symmetry breaking triggers chiral
symmetry breaking in the pattern SU(4) -> Sp(4), which gives rise to a
pseudo-Nambu-Goldstone boson that can act as a composite Higgs boson. The top
quark is elementary, and the top and electroweak gauge loop contributions to
the Higgs mass are cut off entirely by Higgs compositeness. In particular, the
model requires no top partners and no "little Higgs" mechanism. A nontrivial
vacuum alignment results from the interplay of the top loop and technifermion
mass terms. The composite Higgs mass is completely determined by the top loop,
in the sense that m_h/m_t is independent of the vacuum alignment and is
computable by a strong-coupling calculation. There is an additional composite
pseudoscalar A with mass larger than m_h and suppressed direct production at
LHC. We discuss the electroweak fit in this model in detail. Corrections to Z
-> bb and the T parameter from the top sector are suppressed by the enhanced
Sp(4) custodial symmetry. Even assuming that the strong contribution to the S
parameter is positive and usuppressed, a good electroweak fit can be obtained
for v/f ~ 0.25, where v and f are the electroweak and chiral symmetry breaking
scales respectively. This requires fine tuning at the 10% level.Comment: 34 pages, 4 figures; v2: updated precision electroweak fi
Goldstone Bosons in Effective Theories with Spontaneously Broken Flavour
  Symmetry

The Flavour Symmetry of the Standard Model (SM) gauge sector is broken by the
fermion Yukawa couplings. Promoting the Yukawa matrices to scalar spurion
fields, one can break the flavour symmetry spontaneously by giving appropriate
vacuum expectation values (VEVs) to the spurion fields, and one encounters
Goldstone modes for every broken flavour symmetry generator. In this paper, we
point out various aspects related to the possible dynamical interpretation of
the Goldstone bosons: (i) In an effective-theory framework with local flavour
symmetry, the Goldstone fields represent the longitudinal modes for massive
gauge bosons. The spectrum of the latter follows the sequence of
flavour-symmetry breaking related to the hierarchies in Yukawa couplings and
flavour mixing angles. (ii) Gauge anomalies can be consistently treated by
adding higher-dimensional operators. (iii) Leaving the U(1) factors of the
flavour symmetry group as global symmetries, the respective Goldstone modes
behave as axions which can be used to resolve the strong CP problem by a
modified Peccei-Quinn mechanism. (iv) The dynamical picture of flavour symmetry
breaking implies new sources of flavour-changing neutral currents, which arise
from integrating out heavy scalar spurion fields and heavy gauge bosons. The
coefficients of the effective operators follow the minimal-flavour violation
principle.Comment: 27 pages, abstract and introduction extended, more detailed
  discussion of heavy gauge boson spectrum and auxiliary heavy fermions,
  outline restructured. Matches version to be published in JHE
New recursive residue formulas for the topological expansion of the
  Cauchy Matrix Model

In a recent work [1] we consider the topological expansion for the non-mixed
observables (including the free energy) for the formal Cauchy matrix model. The
only restriction in [1] was the fact that all the branch points have to be
simple. This excludes a very interesting situation not encountered in the
literature before, namely the case in which two branch points merge in such a
way that no cycle is pinched. In this work we focus on this situation and
derive new formulas that apply to non-simple and non-singular branch-points.Comment: 42 pages, one appendix added, referee comments added, minor typos
  correcte
Unusual Thermodynamics on the Fuzzy 2-Sphere

Higher spin Dirac operators on both the continuum sphere($S^2$) and its fuzzy
analog($S^2_F$) come paired with anticommuting chirality operators. A
consequence of this is seen in the fermion-like spectrum of these operators
which is especially true even for the case of integer-spin Dirac operators.
Motivated by this feature of the spectrum of a spin 1 Dirac operator on
$S_F^2$, we assume the spin 1 particles obey Fermi-Dirac statistics. This
choice is inspite of the lack of a well defined spin-statistics relation on a
compact surface such as $S^2$. The specific heats are computed in the cases of
the spin $\frac{1}{2}$ and spin 1 Dirac operators. Remarkably the specific heat
for a system of spin $\frac{1}{2}$ particles is more than that of the spin 1
case, though the number of degrees of freedom is more in the case of spin 1
particles. The reason for this is inferred through a study of the spectrums of
the Dirac operators in both the cases. The zero modes of the spin 1 Dirac
operator is studied as a function of the cut-off angular momentum $L$ and is
found to follow a simple power law. This number is such that the number of
states with positive energy for the spin 1 and spin $\frac{1}{2}$ system become
comparable. Remarks are made about the spectrums of higher spin Dirac operators
as well through a study of their zero-modes and the variation of their spectrum
with degeneracy. The mean energy as a function of temperature is studied in
both the spin $\frac{1}{2}$ and spin 1 cases. They are found to deviate from
the standard ideal gas law in 2+1 dimensions.Comment: 19 pages, 7 figures. The paper has been significantly modified. Main
  results are unchange
Competing Holographic Orders

We model competition between different macroscopic orders in an holographic
context. The orders we considered are a superconducting order, modeled by a
charged scalar field, and a magnetic order modeled by a neutral scalar field.
We also discuss the case of two competing scalars coupled to a single gauge
field. In all cases discussed here the phases tend to compete, rather than
enhance each other. The condensation of one scalar hinders any further
instabilities, unless we have a sufficiently strong repulsive interactions
between the bulk scalars. We provide both analytic arguments and numerical
demonstration of this fact. Based on the cases discussed here, we conjecture
that holographic orders tend to compete for attractive bulk interactions,
including gravity, and to cooperate, or be mutually enhancing, for repulsive
bulk interactions between the corresponding order parameters.Comment: Minor changes, 17 pages, 5 figure
Angular distribution of thrust axis with power-suppressed contribution
  in e+e- annihilation

Structure function of e+e- to hadrons cross section proportional to the
longitudinal part of the hadron tensor is power suppressed with respect to an
event shape variable in the two-jet region. In the SCET framework, we study the
event shape distribution for this structure function to NLL level of accuracy.
As, a result we obtain the angular distribution of hadron jets as a function of
the thrust, in the two jet region. We further examine effects of
non-perturbative hadronization corrections by adopting a shape function that
reproduce the observed event shape distributions. Impacts of our findings on
the electroweak measurements via the jet angular forward-backward asymmetry are
discussed.Comment: 28 pages, 9 figure
The Weinberg Operator and a Lower String Scale in Orientifold
  Compactifications

We investigate the interplay between the string scale and phenomenological
scales in orientifold compactifications. Specifically, we discuss in generality
the tension that often arises in accounting for neutrino masses, Yukawa
couplings, and a mu-term of the correct order and show that it often constrains
the string scale M_s. The discussion focuses on two scenarios where, (1) the
observed order of the neutrino masses are accounted for by a D-instanton
induced "stringy" Weinberg operator, or (2) effectively via the type I seesaw
mechanism with an instanton induced Majorana mass term. In both scenarios, the
string scale might be further constrained if the suppression factor of a single
D-instanton must account for two of the phenomenological scales. For the sake
of concreteness, we present phenomenologically viable quivers which exhibit
these effects and perform a systematic analysis of four-stack and five-stack
quivers which give rise to the exact MSSM spectrum and account for the order of
the neutrino masses via the stringy Weinberg operator.Comment: 27 page
The Goldstini Variations

We study the 'goldstini' scenario of Cheung, Nomura, and Thaler, in which
multiple independent supersymmetry (SUSY) breaking sectors lead to multiple
would-be goldstinos, changing collider and cosmological phenomenology. In
supergravity, potentially large corrections to the previous prediction of twice
the gravitino mass for goldstini masses can arise when their scalar partners
are stabilized far from the origin. Considerations arising from the complexity
of realistic string compactifications indicate that many of the independent
SUSY-breaking sectors should be conformally sequestered or situated in warped
Randall-Sundrum-like throats, further changing the predicted goldstini masses.
If the sequestered hidden sector is a metastable SUSY-breaking sector of the
Intriligator-Seiberg-Shih (ISS) type then multiple goldstini can originate from
within a single sector, along with many supplementary 'modulini', all with
masses of order twice the gravitino mass. These fields can couple to the
Supersymmetric Standard Model (SSM) via the 'Goldstino Portal'. Collider
signatures involving SSM sparticle decays can provide strong evidence for
warped-or-conformally-sequestered sectors, and of the ISS mechanism of SUSY
breaking. Along with axions and photini, the Goldstino Portal gives another
potential window to the hidden sectors of string theory.Comment: 30 pages, 3 figures; v2 minor changes, references adde
Discrimination of low missing energy look-alikes at the LHC

The problem of discriminating possible scenarios of TeV scale new physics
with large missing energy signature at the Large Hadron Collider (LHC) has
received some attention in the recent past. We consider the complementary, and
yet unexplored, case of theories predicting much softer missing energy spectra.
As there is enough scope for such models to fake each other by having similar
final states at the LHC, we have outlined a systematic method based on a
combination of different kinematic features which can be used to distinguish
among different possibilities. These features often trace back to the
underlying mass spectrum and the spins of the new particles present in these
models. As examples of "low missing energy look-alikes", we consider
Supersymmetry with R-parity violation, Universal Extra Dimensions with both
KK-parity conserved and KK-parity violated and the Littlest Higgs model with
T-parity violated by the Wess-Zumino-Witten anomaly term. Through detailed
Monte Carlo analysis of the four and higher lepton final states predicted by
these models, we show that the models in their minimal forms may be
distinguished at the LHC, while non-minimal variations can always leave scope
for further confusion. We find that, for strongly interacting new particle
mass-scale ~600 GeV (1 TeV), the simplest versions of the different theories
can be discriminated at the LHC running at sqrt{s}=14 TeV within an integrated
luminosity of 5 (30) fb^{-1}.Comment: 40 pages, 10 figures; v2: Further discussions, analysis and one
  figure added, ordering of certain sections changed, minor modifications in
  the abstract, version as published in JHE
Feynman rules for the rational part of the Electroweak 1-loop amplitudes

We present the complete set of Feynman rules producing the rational terms of
kind R_2 needed to perform any 1-loop calculation in the Electroweak Standard
Model. Our results are given both in the 't Hooft-Veltman and in the Four
Dimensional Helicity regularization schemes. We also verified, by using both
the 't Hooft-Feynman gauge and the Background Field Method, a huge set of Ward
identities -up to 4-points- for the complete rational part of the Electroweak
amplitudes. This provides a stringent check of our results and, as a
by-product, an explicit test of the gauge invariance of the Four Dimensional
Helicity regularization scheme in the complete Standard Model at 1-loop. The
formulae presented in this paper provide the last missing piece for completely
automatizing, in the framework of the OPP method, the 1-loop calculations in
the SU(3) X SU(2) X U(1) Standard Model.Comment: Many thanks to Huasheng Shao for having recomputed, independently of
  us, all of the ${\rm R_2}$ effective vertices. Thanks to his help and by
  comparing with an independent computation we performed in a general $R_\xi$
  gauge, we could fix, in the present version, the following formulae: the
  vertex $A l \bar l$ in Eq. (3.6), the vertex $Z \phi^+ \phi^-$ in Eq. (3.8),
  Eqs (3.16), (3.17) and (3.18
Vacua and RG flows in N=9 three dimensional gauged supergravity

We study some vacua of N=9 three dimensional gauged supergravity. The theory
contains sixteen scalar fields parametrizing the exceptional coset space
${F_{4(-20)}}{SO(9)}$. Various AdS supersymmetric and some non-supersymmetric
vacua are found in both compact and non-compact gaugings with gauge groups
$SO(p)\times SO(9-p)$ for $p=0, 1, 2, 3, 4$, $G_{2(-14)}\times SL(2)$ and
$Sp(1,2)\times SU(2)$. We also study many RG flow solutions, both analytic and
numerical, interpolating between supersymmetric critical points in this theory.
All the flows considered here are driven by a relevant operator of dimension
$\Delta={3}{2}$. This operator breaks conformal symmetry as well as
supersymmetry and drives the CFT in the UV to another CFT in the IR with lower
supersymmetries.Comment: 30 pp. 6 figures, references and new information adde
Jet quenching in hot strongly coupled gauge theories revisited: 3-point
  correlators with gauge-gravity duality

Previous studies of high-energy jet stopping in strongly-coupled plasmas have
lacked a clear gauge-theory specification of the initial state. We show how to
set up a well-defined gauge theory problem to study jet stopping in pure {\cal
N}=4 super Yang Mills theory (somewhat analogous to Hofman and Maldacena's
studies at zero temperature) and solve it by using gauge-gravity duality for
real-time, finite-temperature 3-point correlators. Previous studies have found
that the stopping distance scales with energy as E^{1/3} (with disagreement on
the gauge coupling dependence). We do find that none of the jet survives beyond
this scale, but we find that almost all of our jet stops at a parametrically
smaller scale proportional to (E L)^{1/4}, where L is the size of the
space-time region where the jet is initially created.Comment: 53 pages, 13 figures [Change from v1: A factor of 2 normalization
  error is corrected in our intermediate calculations, starting from (2.12).
  Final results are not affected. The other changes are minor and cosmetic.
More on the Nambu-Poisson M5-brane Theory: Scaling limit, background
  independence and an all order solution to the Seiberg-Witten map

We continue our investigation on the Nambu-Poisson description of M5-brane in
a large constant C-field background (NP M5-brane theory) constructed in
Refs.[1, 2]. In this paper, the low energy limit where the NP M5-brane theory
is applicable is clarified. The background independence of the NP M5-brane
theory is made manifest using the variables in the BLG model of multiple
M2-branes. An all order solution to the Seiberg-Witten map is also constructed.Comment: expanded explanations, minor corrections and typos correcte