pinecone/core-2020-05-10-deduplication huggingface dataset:
The N=1 Low-Energy Effective Action of Spontaneously Broken N=2
  Supergravities

We consider the class of four-dimensional N=2 gauged supergravities whose
maximally symmetric ground states leave only one of the two supersymmetries
intact. For these theories we derive the low-energy effective action below the
scale of partial supersymmetry breaking and compute the N=1 couplings in terms
of the N=2 'input data'. We show that this effective action satisfies the
constraints of N=1 supergravity in that its sigma-model metric is Kahler, while
the superpotential and the gauge kinetic functions are holomorphic. As an
example we discuss the N=1 effective supergravity of type II compactifications.Comment: 37 pages; v2: typos corrected, Appendix B clarified (published
  version
Effective Supersymmetry at the LHC

We investigate the phenomenology of Effective Supersymmetry (ESUSY) models
wherein electroweak gauginos and third generation scalars have masses up to
about 1~TeV while first and second generation scalars lie in the multi-TeV
range. Such models ameliorate the SUSY flavor and CP problems via a decoupling
solution, while at the same time maintaining naturalness. In our analysis, we
assume independent GUT scale mass parameters for third and first/second
generation scalars and for the Higgs scalars, in addition to m_{1/2}, \tan\beta
and A_0, and require radiative electroweak symmetry breaking as usual. We
analyse the parameter space which is consistent with current constraints, by
means of a Markov Chain Monte Carlo scan. The lightest MSSM particle (LMP) is
mostly, but not always the lightest neutralino, and moreover, the thermal relic
density of the neutralino LMP is frequently very large. These models may
phenomenologically be perfectly viable if the LMP before nucleosynthesis decays
into the axino plus SM particles. Dark matter is then an axion/axino mixture.
At the LHC, the most important production mechanisms are gluino production (for
m_{1/2} ~<700~GeV) and third generation squark production, while SUSY events
rich in b-jets are the hallmark of the ESUSY scenario. We present a set of
ESUSY benchmark points with characteristic features and discuss their LHC
phenomenology.Comment: 26 pages including 13 figure
Casimir effect of electromagnetic field in Randall-Sundrum spacetime

We study the finite temperature Casimir effect on a pair of parallel
perfectly conducting plates in Randall-Sundrum model without using scalar field
analogy. Two different ways of interpreting perfectly conducting conditions are
discussed. The conventional way that uses perfectly conducting condition
induced from 5D leads to three discrete mode corrections. This is very
different from the result obtained from imposing 4D perfectly conducting
conditions on the 4D massless and massive vector fields obtained by decomposing
the 5D electromagnetic field. The latter only contains two discrete mode
corrections, but it has a continuum mode correction that depends on the
thicknesses of the plates. It is shown that under both boundary conditions, the
corrections to the Casimir force make the Casimir force more attractive. The
correction under 4D perfectly conducting condition is always smaller than the
correction under the 5D induced perfectly conducting condition. These
statements are true at any temperature.Comment: 20 pages, 4 figure
Holographic Neutron Stars

We construct in the context of the AdS/CFT correspondence degenerate
composite operators in the conformal field theory that are holographically dual
to degenerate stars in anti de Sitter space. We calculate the effect of the
gravitational back-reaction using the Tolman-Oppenheimer-Volkoff equations, and
determine the "Chandrasekhar limit" beyond which the star undergoes
gravitational collapse towards a black hole.Comment: 4 pages, 3 figures, pdflatex. Typos and cross reference corrected,
  discussion clarifie
Precision Spectroscopy and Higher Spin symmetry in the ABJM model

We revisit Kaluza-Klein compactification of 11-d supergravity on S^7/Z_k
using group theory techniques that may find application in other flux vacua
with internal coset spaces. Among the SO(2) neutral states, we identify
marginal deformations and fields that couple to the recently discussed
world-sheet instanton of Type IIA on CP^3. We also discuss charged states, dual
to monopole operators, and the Z_k projection of the Osp(4|8) singleton and its
tensor products. In particular, we show that the doubleton spectrum may account
for N=6 higher spin symmetry enhancement in the limit of vanishing 't Hooft
coupling in the boundary Chern-Simons theory.Comment: 44 page
Axion-like-particle search with high-intensity lasers

We study ALP-photon-conversion within strong inhomogeneous electromagnetic
fields as provided by contemporary high-intensity laser systems. We observe
that probe photons traversing the focal spot of a superposition of Gaussian
beams of a single high-intensity laser at fundamental and frequency-doubled
mode can experience a frequency shift due to their intermittent propagation as
axion-like-particles. This process is strongly peaked for resonant masses on
the order of the involved laser frequencies. Purely laser-based experiments in
optical setups are sensitive to ALPs in the $\mathrm{eV}$ mass range and can
thus complement ALP searches at dipole magnets.Comment: 25 pages, 2 figure
Neutralino versus axion/axino cold dark matter in the 19 parameter SUGRA
  model

We calculate the relic abundance of thermally produced neutralino cold dark
matter in the general 19 parameter supergravity (SUGRA-19) model. A scan over
GUT scale parameters reveals that models with a bino-like neutralino typically
give rise to a dark matter density \Omega_{\tz_1}h^2\sim 1-1000, i.e. between 1
and 4 orders of magnitude higher than the measured value. Models with higgsino
or wino cold dark matter can yield the correct relic density, but mainly for
neutralino masses around 700-1300 GeV. Models with mixed bino-wino or
bino-higgsino CDM, or models with dominant co-annihilation or A-resonance
annihilation can yield the correct abundance, but such cases are extremely hard
to generate using a general scan over GUT scale parameters; this is indicative
of high fine-tuning of the relic abundance in these cases. Requiring that
m_{\tz_1}\alt 500 GeV (as a rough naturalness requirement) gives rise to a
minimal probably dip in parameter space at the measured CDM abundance. For
comparison, we also scan over mSUGRA space with four free parameters. Finally,
we investigate the Peccei-Quinn augmented MSSM with mixed axion/axino cold dark
matter. In this case, the relic abundance agrees more naturally with the
measured value. In light of our cumulative results, we conclude that future
axion searches should probe much more broadly in axion mass, and deeper into
the axion coupling.Comment: 23 pages including 17 .eps figure
The gravitino coupling to broken gauge theories applied to the MSSM

We consider gravitino couplings in theories with broken gauge symmetries. In
particular, we compute the single gravitino production cross section in W+ W-
fusion processes. Despite recent claims to the contrary, we show that this
process is always subdominant to gluon fusion processes in the high energy
limit. The full calculation is performed numerically; however, we give analytic
expressions for the cross section in the supersymmetric and electroweak limits.
We also confirm these results with the use of the effective theory of goldstino
interactions.Comment: 26 pages, 4 figure
Sparticle masses from transverse mass kinks at the LHC: the case of
  Yukawa-unified SUSY GUTs

We explore, in a concrete example, to which extent new particle mass
determinations are practicable with LHC data. Our chosen example is that of
Yukawa-unified SUSY GUTs, whose viability has been recently studied for two
general patterns of soft SUSY-breaking terms. We note that both patterns of
SUSY spectra do not admit long decay chains, which would make it possible to
determine the masses of the SUSY particles involved using endpoints or mass
relations. We thus take the so-called mT2-kink method as our key strategy,
since it does not rely on the presence of long decay chains. We then discuss a
procedure allowing to determine the masses of the gluino, of the lightest
chargino as well as of the first two neutralinos and, for the scenario where a
stop is lighter than the gluino, the mass of the light stop too. Our worked
example of Yukawa-unified SUSY GUTs may offer a useful playground for dealing
with other theories which predict similar patterns of SUSY spectra.Comment: 1+26 pages, 11 figures, 5 tables. v3: references and a few textual
  clarifications added. Matches journal versio
Viscosity Bound and Causality in Superfluid Plasma

It was argued by Brigante et.al that the lower bound on the ratio of the
shear viscosity to the entropy density in strongly coupled plasma is translated
into microcausality violation in the dual gravitational description. Since
transport properties of the system characterize its infrared dynamics, while
the causality of the theory is determined by its ultraviolet behavior, the
viscosity bound/microcausality link should not be applicable to theories that
undergo low temperature phase transitions. We present an explicit model of
AdS/CFT correspondence that confirms this fact.Comment: 27 pages, 5 figures. References added, typos fixe
Holography of Dyonic Dilaton Black Branes

We study black branes carrying both electric and magnetic charges in
Einstein-Maxwell theory coupled to a dilaton-axion in asymptotically anti de
Sitter space. After reviewing and extending earlier results for the case of
electrically charged branes, we characterise the thermodynamics of magnetically
charged branes. We then focus on dyonic branes in theories which enjoy an
$SL(2,R)$ electric-magnetic duality. Using $SL(2,R)$, we are able to generate
solutions with arbitrary charges starting with the electrically charged
solution, and also calculate transport coefficients. These solutions all
exhibit a Lifshitz-like near-horizon geometry. The system behaves as expected
for a charged fluid in a magnetic field, with non-vanishing Hall conductance
and vanishing DC longitudinal conductivity at low temperatures. Its response is
characterised by a cyclotron resonance at a frequency proportional to the
magnetic field, for small magnetic fields. Interestingly, the DC Hall
conductance is related to the attractor value of the axion. We also study the
attractor flows of the dilaton-axion, both in cases with and without an
additional modular-invariant scalar potential. The flows exhibit intricate
behaviour related to the duality symmetry. Finally, we briefly discuss
attractor flows in more general dilaton-axion theories which do not enjoy
$SL(2,R)$ symmetry.Comment: 56 Pages, 1 figur
Vortices in (2+1)d Conformal Fluids

We study isolated, stationary, axially symmetric vortex solutions in
(2+1)-dimensional viscous conformal fluids. The equations describing them can
be brought to the form of three coupled first order ODEs for the radial and
rotational velocities and the temperature. They have a rich space of solutions
characterized by the radial energy and angular momentum fluxes. We do a
detailed study of the phases in the one-parameter family of solutions with no
energy flux. This parameter is the product of the asymptotic vorticity and
temperature. When it is large, the radial fluid velocity reaches the speed of
light at a finite inner radius. When it is below a critical value, the velocity
is everywhere bounded, but at the origin there is a discontinuity. We comment
on turbulence, potential gravity duals, non-viscous limits and non-relativistic
limits.Comment: 39 pages, 10 eps figures, v2: Minor changes, refs, preprint numbe
Deformed Skyrme Crystals

The Skyrme crystal, a solution of the Skyrme model, is the lowest
energy-per-charge configuration of skyrmions seen so far. Our numerical
investigations show that, as the period in various space directions is changed,
one obtains various other configurations, such as a double square wall, and
parallel vortex-like solutions. We also show that there is a sudden "phase
transition" between a Skyrme crystal and the charge 4 skyrmion with cubic
symmetry as the period is gradually increased in all three space directions.Comment: 13 pages, 6 figures. To be published in JHE
Scaled momentum spectra in deep inelastic scattering at HERA

Charged particle production has been studied in neutral current deep
inelastic ep scattering with the ZEUS detector at HERA using an integrated
luminosity of 0.44 fb^-1. Distributions of scaled momenta in the Breit frame
are presented for particles in the current fragmentation region. The evolution
of these spectra with the photon virtuality, Q^2, is described in the kinematic
region 10<Q^2<41000 GeV^2. Next-to-leading-order and modified
leading-log-approximation QCD calculations as well as predictions from Monte
Carlo models are compared to the data. The results are also compared to e+e-
annihilation data. The dependences of the pseudorapidity distribution of the
particles on Q^2 and on the energy in the \gamma p system, W, are presented and
interpreted in the context of the hypothesis of limiting fragmentation.Comment: 44 pages, 11 figures, 21 table
The supermultiplet of boundary conditions in supergravity

Boundary conditions in supergravity on a manifold with boundary relate the
bulk gravitino to the boundary supercurrent, and the normal derivative of the
bulk metric to the boundary energy-momentum tensor. In the 3D N=1 setting, we
show that these boundary conditions can be stated in a manifestly
supersymmetric form. We identify the Extrinsic Curvature Tensor Multiplet, and
show that boundary conditions set it equal to (a conjugate of) the boundary
supercurrent multiplet. Extension of our results to higher-dimensional models
(including the Randall-Sundrum and Horava-Witten scenarios) is discussed.Comment: 22 pages. JHEP format; references added; published versio
Electroweak Constraints on Warped Geometry in Five Dimensions and Beyond

Here we consider the tree level corrections to electroweak (EW) observables
from standard model (SM) particles propagating in generic warped extra
dimensions. The scale of these corrections is found to be dominated by three
parameters, the Kaluza-Klein (KK) mass scale, the relative coupling of the KK
gauge fields to the Higgs and the relative coupling of the KK gauge fields to
fermion zero modes. It is found that 5D spaces that resolve the hierarchy
problem through warping typically have large gauge-Higgs coupling. It is also
found in $D>5$ where the additional dimensions are warped the relative
gauge-Higgs coupling scales as a function of the warp factor. If the warp
factor of the additional spaces is contracting towards the IR brane, both the
relative gauge-Higgs coupling and resulting EW corrections will be large.
Conversely EW constraints could be reduced by finding a space where the
additional dimension's warp factor is increasing towards the IR brane. We
demonstrate that the Klebanov Strassler solution belongs to the former of these
possibilities.Comment: 18 pages, 3 figures (references added) version to appear in JHE
On-shell Recursion in String Theory

We prove that all open string theory disc amplitudes in a flat background
obey Britto-Cachazo-Feng-Witten (BCFW) on-shell recursion relations, up to a
possible reality condition on a kinematic invariant. Arguments that the same
holds for tree level closed string amplitudes are given as well. Non-adjacent
BCFW-shifts are related to adjacent shifts through monodromy relations for
which we provide a novel CFT based derivation. All possible recursion relations
are related by old-fashioned string duality. The field theory limit of the
analysis for amplitudes involving gluons is explicitly shown to be smooth for
both the bosonic string as well as the superstring. In addition to a proof a
less rigorous but more powerful argument based on the underlying CFT is
presented which suggests that the technique may extend to a much more general
setting in string theory. This is illustrated by a discussion of the open
string in a constant B-field background and the closed string on the level of
the sphere.Comment: 36 + 9 pages text, one figure, v3: added discussion on relation to
  old-fashioned factorization, typos corrected, published versio
Implications of Flavor Dynamics for Fermion Triplet Leptogenesis

We analyze the importance of flavor effects in models in which leptogenesis
proceeds via the decay of Majorana electroweak triplets. We find that depending
on the relative strengths of gauge and Yukawa reactions the $B-L$ asymmetry can
be sizably enhanced, exceeding in some cases an order of magnitude level. We
also discuss the impact that such effects can have for TeV-scale triplets
showing that as long as the $B-L$ asymmetry is produced by the dynamics of the
lightest such triplet they are negligible, but open the possibility for
scenarios in which the asymmetry is generated above the TeV scale by heavier
states, possibly surviving the TeV triplet related washouts. We investigate
these cases and show how they can be disentangled at the LHC by using Majorana
triplet collider observables and, in the case of minimal type III see-saw
models even through lepton flavor violation observables.Comment: 22 pages, 9 figures, extended discussion on collider phenomenology,
  references added. Version matches publication in JHE
Phenomenology of SUSY SU(5) with type I+III seesaw

We consider a supersymmetric SU(5) model where two neutrino masses are
obtained via a mixed type I+III seesaw mechanism induced by the component
fields of a single SU(5) adjoint. We have analyzed the phenomenology of the
model paying particular attention to flavour violating processes and dark
matter relic density, assuming universal boundary conditions. We have found
that, for a seesaw scale larger than $10^{12\div 13}$ GeV, BR$(\mu\to e
\gamma)$ is in the reach of the MEG experiment in sizable regions of the
parameter space. On the other side, current bounds on it force BR$(\tau \to \mu
\gamma)$ to be well below the reach of forthcoming experiments, rendering thus
the model disprovable if a positive signal is found. The same bounds still
allow for a sizable positive contribution to $\epsilon_K$, while the CP
violation in the $B_s$ mixing turns out to be too small to account for the
di-muon anomaly reported by the D0 collaboration. Finally, the regions where
the neutralino relic density is within the WMAP bounds can be strongly modified
with respect to the constrained MSSM case. In particular, a peculiar
coannihilation region, bounded from above, can be realized, which allows us to
put an upper bound on the dark matter mass for certain set-ups of the
parameters.Comment: 12 pages, 6 figures; v2: minor changes, comparison with type I and II
  seesaws added, references added, version to appear on JHE
Measuring V_ub and probing SUSY with double ratios of purely leptonic
  decays of B and D mesons

The experimental prospects for precise measurements of the leptonic decays
B_u -> tau nu / mu nu, B_s -> mu+ mu-, D -> mu nu and D_s -> mu nu / tau nu are
very promising. Double ratios involving four of these decays can be defined in
which the dependence on the values of the decay constants is essentially
eliminated, thus enabling complementary measurements of the CKM matrix element
V_ub with a small theoretical error. We quantify the experimental error in a
possible future measurement of |V_ub| using this approach, and show that it is
competitive with the anticipated precision from the conventional approaches.
Moreover, it is shown that such double ratios can be more effective than the
individual leptonic decays as a probe of the parameter space of supersymmetric
models. We emphasize that the double ratios have the advantage of using |V_ub|
as an input parameter (for which there is experimental information), while the
individual decays have an uncertainty from the decay constants (e.g. f_B_s),
and hence a reliance on theoretical techniques such as lattice QCD.Comment: 21 pages, 4 figure
Self-bound dense objects in holographic QCD

We study a self-bound dense object in the hard wall model. We consider a
spherically symmetric dense object which is characterized by its radial density
distribution and non-uniform but spherically symmetric chiral condensate. For
this we analytically solve the partial differential equations in the hard wall
model and read off the radial coordinate dependence of the density and chiral
condensate according to the AdS/CFT correspondence. We then attempt to describe
nucleon density profiles of a few nuclei within our framework and observe that
the confinement scale changes from a free nucleon to a nucleus. We briefly
discuss how to include the effect of higher dimensional operator into our
study. We finally comment on possible extensions of our work.Comment: 17 pages, 5 figures, figures replaced, minor revision, to appear in
  JHE
Renormalization in General Gauge Mediation

We revisit General Gauge Mediation (GGM) in light of the supersymmetric
(linear) sigma model by utilizing the current superfield. The current
superfield in the GGM is identified with supersymmetric extension of the vector
symmetry current of the sigma model while spontaneous breakdown of
supersymmetry in the GGM corresponds to soft breakdown of the axial vector
symmetry of the sigma model. We first derive the current superfield from the
supersymmetric linear sigma model and then compute 2-point functions of the
current superfield using the (anti-)commutation relations of the messenger
component fields. After the global symmetry are weakly gauged, the 2-point
functions of the current superfield are identified with a part of the 2-point
functions of the associated vector superfield. We renormalize them by
dimensional regularization and show that physical gaugino and sfermion masses
of the MSSM are expressed in terms of the wavefunction renormalization
constants of the component fields of the vector superfield.Comment: 25 pages, 12 figure
Non-Einstein geometries in Chiral Gravity

We analyze the asymptotic solutions of Chiral Gravity (Topologically Massive
Gravity at \mu l = 1 with Brown-Henneaux boundary conditions) focusing on
non-Einstein metrics. A class of such solutions admits curvature singularities
in the interior which are reflected as singularities or infinite bulk energy of
the corresponding linear solutions. A non-linear solution is found exactly. The
back-reaction induces a repulsion of geodesics and a shielding of the
singularity by an event horizon but also introduces closed timelike curves.Comment: 11 pages, 3 figures. v2: references and comments on linear stability
  (Sect.2) adde
Quantum Symmetries and Marginal Deformations

We study the symmetries of the N=1 exactly marginal deformations of N=4 Super
Yang-Mills theory. For generic values of the parameters, these deformations are
known to break the SU(3) part of the R-symmetry group down to a discrete
subgroup. However, a closer look from the perspective of quantum groups reveals
that the Lagrangian is in fact invariant under a certain Hopf algebra which is
a non-standard quantum deformation of the algebra of functions on SU(3). Our
discussion is motivated by the desire to better understand why these theories
have significant differences from N=4 SYM regarding the planar integrability
(or rather lack thereof) of the spin chains encoding their spectrum. However,
our construction works at the level of the classical Lagrangian, without
relying on the language of spin chains. Our approach might eventually provide a
better understanding of the finiteness properties of these theories as well as
help in the construction of their AdS/CFT duals.Comment: 1+40 pages. v2: minor clarifications and references added. v3: Added
  an appendix, fixed minor typo