pinecone/core-2020-05-10-deduplication huggingface dataset:
Composite GUTs: models and expectations at the LHC

We investigate grand unified theories (GUTs) in scenarios where electroweak
(EW) symmetry breaking is triggered by a light composite Higgs, arising as a
Nambu-Goldstone boson from a strongly interacting sector. The evolution of the
standard model (SM) gauge couplings can be predicted at leading order, if the
global symmetry of the composite sector is a simple group G that contains the
SM gauge group. It was noticed that, if the right-handed top quark is also
composite, precision gauge unification can be achieved. We build minimal
consistent models for a composite sector with these properties, thus
demonstrating how composite GUTs may represent an alternative to supersymmetric
GUTs. Taking into account the new contributions to the EW precision parameters,
we compute the Higgs effective potential and prove that it realizes
consistently EW symmetry breaking with little fine-tuning. The G group
structure and the requirement of proton stability determine the nature of the
light composite states accompanying the Higgs and the top quark: a coloured
triplet scalar and several vector-like fermions with exotic quantum numbers. We
analyse the signatures of these composite partners at hadron colliders:
distinctive final states contain multiple top and bottom quarks, either alone
or accompanied by a heavy stable charged particle, or by missing transverse
energy.Comment: 55 pages, 13 figures, final version to be published in JHE
How to halve maximal supergravity

We work out the truncation from maximal to half-maximal supergravity in four
dimensions. In particular, we determine the explicit constraints on the
embedding tensors of both theories. These tensors specify the complete
theories, including gauge groups and scalar potentials. Firstly, we find the
linear constraint on N=8 theories to allow for a truncation to N=4. Secondly,
we determine the additional N=4 quadratic constraints following from N=8.
Finally, we comment on a brane interpretation as tadpole conditions for the
latter.Comment: 15 pages, 1 figure. v3: minor clarifications, typos corrected -
  published versio
Holographic and Wilsonian Renormalization Groups

We develop parallels between the holographic renormalization group in the
bulk and the Wilsonian renormalization group in the dual field theory. Our
philosophy differs from most previous work on the holographic RG; the most
notable feature is the key role of multi-trace operators. We work out the forms
of various single- and double-trace flows. The key question, `what cutoff on
the field theory corresponds to a radial cutoff in the bulk?' is left
unanswered, but by sharpening the analogy between the two sides we identify
possible directions.Comment: 31 pages, 3 figures. v2: Minor clarifications. Added reference
Conservation laws and tachyon potentials in the sliver frame

Conservation laws have provided an elegant and efficient tool to evaluate the
open string field theory interaction vertex, they have been originally
implemented in the case where the string field is expanded in the Virasoro
basis. In this work we derive conservation laws in the case where the string
field is expanded in the so-called sliver $\mathcal{L}_0$-basis. As an
application of these conservation laws derived in the sliver frame, we compute
the open string field action relevant to the tachyon condensation and in order
to present not only an illustration but also an additional information, we
evaluate the action without imposing a gauge choice.Comment: 26 pages, some typos fixed, comments added, references adde
Orbifold equivalence for finite density QCD and effective field theory

In the large N_c limit, some apparently different gauge theories turn out to
be equivalent due to large N_c orbifold equivalence. We use effective field
theory techniques to explore orbifold equivalence, focusing on the specific
case of a recently discovered relation between an SO(2N_c) gauge theory and
QCD. The equivalence to QCD has been argued to hold at finite baryon chemical
potential, \mu_B, so long as one deforms the SO(2N_c) theory by certain
"double-trace" terms. The deformed SO(2N_c) theory can be studied without a
sign problem in the chiral limit, in contrast to SU(N_c) QCD at finite \mu_B.
The purpose of the double-trace deformation in the SO(2N_c) theory is to
prevent baryon number symmetry from breaking spontaneously at finite density,
which is necessary for the equivalence to large N_c QCD to be valid. The
effective field theory analysis presented here clarifies the physical
significance of double-trace deformations, and strongly supports the proposed
equivalence between the deformed SO(2N_c) theory and large N_c QCD at finite
density.Comment: 39 pages, 5 figures, 2 tables. v2: Minor typo fixes and
  clarification
The impact of the ATLAS zero-lepton, jets and missing momentum search on
  a CMSSM fit

Recent ATLAS data significantly extend the exclusion limits for
supersymmetric particles. We examine the impact of such data on global fits of
the constrained minimal supersymmetric standard model (CMSSM) to indirect and
cosmological data. We calculate the likelihood map of the ATLAS search, taking
into account systematic errors on the signal and on the background. We validate
our calculation against the ATLAS determinaton of 95% confidence level
exclusion contours. A previous CMSSM global fit is then re-weighted by the
likelihood map, which takes a bite at the high probability density region of
the global fit, pushing scalar and gaugino masses up.Comment: 16 pages, 7 figures. v2 has bigger figures and fixed typos. v3 has
  clarified explanation of our handling of signal systematic
Minimal flavour violation extensions of the seesaw

We analyze the most natural formulations of the minimal lepton flavour
violation hypothesis compatible with a type-I seesaw structure with three heavy
singlet neutrinos N, and satisfying the requirement of being predictive, in the
sense that all LFV effects can be expressed in terms of low energy observables.
We find a new interesting realization based on the flavour group $SU(3)_e\times
SU(3)_{\ell+N}$ (being $e$ and $\ell$ respectively the SU(2) singlet and
doublet leptons). An intriguing feature of this realization is that, in the
normal hierarchy scenario for neutrino masses, it allows for sizeable
enhancements of $\mu \to e$ transitions with respect to LFV processes involving
the $\tau$ lepton. We also discuss how the symmetries of the type-I seesaw
allow for a strong suppression of the N mass scale with respect to the scale of
lepton number breaking, without implying a similar suppression for possible
mechanisms of N productionComment: 14 pages, 6 figure
The mass area of jets

We introduce a new characteristic of jets called mass area. It is defined so
as to measure the susceptibility of the jet's mass to contamination from soft
background. The mass area is a close relative of the recently introduced
catchment area of jets. We define it also in two variants: passive and active.
As a preparatory step, we generalise the results for passive and active areas
of two-particle jets to the case where the two constituent particles have
arbitrary transverse momenta. As a main part of our study, we use the mass area
to analyse a range of modern jet algorithms acting on simple one and
two-particle systems. We find a whole variety of behaviours of passive and
active mass areas depending on the algorithm, relative hardness of particles or
their separation. We also study mass areas of jets from Monte Carlo simulations
as well as give an example of how the concept of mass area can be used to
correct jets for contamination from pileup. Our results show that the
information provided by the mass area can be very useful in a range of
jet-based analyses.Comment: 36 pages, 12 figures; v2: improved quality of two plots, added entry
  in acknowledgments, nicer form of formulae in appendix A; v3: added section
  with MC study and pileup correction, version accepted by JHE
(Extra)Ordinary Gauge/Anomaly Mediation

We study anomaly mediation models with gauge mediation effects from
messengers which have a general renormalizable mass matrix with a
supersymmetry-breaking spurion. Our models lead to a rich structure of
supersymmetry breaking terms in the visible sector. We derive sum rules among
the soft scalar masses for each generation. Our sum rules for the first and
second generations are the same as those in general gauge mediation, but the
sum rule for the third generation is different because of the top Yukawa
coupling. We find the parameter space where the tachyonic slepton problem is
solved. We also explore the case in which gauge mediation causes the
anomalously small gaugino masses. Since anomaly mediation effects on the
gaugino masses exist, we can obtain viable mass spectrum of the visible sector
fields.Comment: 24 pages, 10 figure
Holographic Superconductors from Gauged Supergravity

We consider minimal setups arising from different truncations of N=8
five-dimensional SO(6) gauged supergravity to study phase transitions involving
spontaneous breaking of any of the U(1) symmetries in U(1)xU(1)xU(1)in SO(6).
These truncations only keep the three relevant vector fields, four complex
scalar fields carrying U(1) charges, plus two neutral scalar fields required by
consistency. By considering thermal ensembles with different fixed U(1) charge
densities and solving the complete equations including the full back-reaction,
in some cases we find instabilities towards the formation of hairy black holes,
which lead to second order transitions, resulting from a thermodynamical
competition between different sectors. We argue that these should be the
dominant thermodynamical instabilities in the full ten-dimensional type IIB
theory. In other cases we find unstable branches of hairy black holes that
extend to temperatures above a critical temperature (`retrograde
condensation'). The results can be used as a first step to understand new
aspects of the phase diagram of large N, N=4 SU(N) super Yang-Mills theory with
fixed charge densities.Comment: 25 pages, 10 figures. v3: typo corrected in eq. (2.18
De Sitter ground state of scalar-tensor gravity and its primordial
  perturbation

Scalar-tensor gravity is one of the most competitive gravity theory to
Einstein's relativity. We reconstruct the exact de Sitter solution in
scalar-tensor gravity, in which the non-minimal coupling scalar is rolling
along the potential. This solution may have some relation to the early
inflation and present acceleration of the universe. We investigated its
primordial quantum perturbation around the adiabatic vacuum. We put forward for
the first time that exact de Sitter generates non-exactly scale invariant
perturbations. In the conformal coupling case, this model predicts that the
tensor mode of the perturbation (gravity wave) is strongly depressed.Comment: 9 page
Effects of temperature on thick branes and the fermion
  (quasi-)localization

Following Campos's work [Phys. Rev. Lett. 88, 141602 (2002)], we investigate
the effects of temperature on flat, de Sitter (dS), and anti-de Following
Campos's work [Phys. Rev. Lett. \textbf{88}, 141602 (2002)], we investigate the
effects of temperature on flat, de Sitter (dS), and anti-de Sitter (AdS) thick
branes in five-dimensional (5D) warped spacetime, and on the fermion
(quasi-)localization. First, in the case of flat brane, when the critical
temperature reaches, the solution of the background scalar field and the warp
factor is not unique. So the thickness of the flat thick brane is uncertain at
the critical value of the temperature parameter, which is found to be lower
than the one in flat 5D spacetime. The mass spectra of the fermion Kaluza-Klein
(KK) modes are continuous, and there is a series of fermion resonances. The
number and lifetime of the resonances are finite and increase with the
temperature parameter, but the mass of the resonances decreases with the
temperature parameter. Second, in the case of dS brane, we do not find such a
critical value of the temperature parameter. The mass spectra of the fermion KK
modes are also continuous, and there is a series of fermion resonances. The
effects of temperature on resonance number, lifetime, and mass are the same
with the case of flat brane. Last, in the case of AdS brane, {the critical
value of the temperature parameter can less or greater than the one in the flat
5D spacetime.} The spectra of fermion KK modes are discrete, and the mass of
fermion KK modes does not decrease monotonically with increasing temperature
parameter.Comment: 24 pages, 15 figures, published versio
Double Parton Scattering Singularity in One-Loop Integrals

We present a detailed study of the double parton scattering (DPS)
singularity, which is a specific type of Landau singularity that can occur in
certain one-loop graphs in theories with massless particles. A simple formula
for the DPS singular part of a four-point diagram with arbitrary
internal/external particles is derived in terms of the transverse momentum
integral of a product of light cone wavefunctions with tree-level matrix
elements. This is used to reproduce and explain some results for DPS
singularities in box integrals that have been obtained using traditional loop
integration techniques. The formula can be straightforwardly generalised to
calculate the DPS singularity in loops with an arbitrary number of external
particles. We use the generalised version to explain why the specific MHV and
NMHV six-photon amplitudes often studied by the NLO multileg community are not
divergent at the DPS singular point, and point out that whilst all NMHV
amplitudes are always finite, certain MHV amplitudes do contain a DPS
divergence. It is shown that our framework for calculating DPS divergences in
loop diagrams is entirely consistent with the `two-parton GPD' framework of
Diehl and Schafer for calculating proton-proton DPS cross sections, but is
inconsistent with the `double PDF' framework of Snigirev.Comment: 29 pages, 8 figures. Minor corrections and clarifications added.
  Version accepted for publication in JHE
Mixed Mediation of Supersymmetry Breaking with Anomalous U(1) Gauge
  Symmetry

Models with anomalous U(1) gauge symmetry contain various superfields which
can have nonzero supersymmetry breaking auxiliary components providing the
origin of soft terms in the visible sector, e.g. the U(1) vector superfield,
the modulus or dilaton superfield implementing the Green-Schwarz anomaly
cancellation mechanism, U(1)-charged but standard model singlet matter
superfield required to cancel the Fayet-Iliopoulos term, and finally the
supergravity multiplet. We examine the relative strength between these
supersymmetry breaking components in a simple class of models, and find that
various different mixed mediations of supersymmetry breaking, involving the
modulus, gauge, anomaly and D-term mediations, can be realized depending upon
the characteristics of D-flat directions and how those D-flat directions are
stabilized with a vanishing cosmological constant. We identify two parameters
which represent such properties and thus characterize how the various
mediations are mixed. We also discuss the moduli stabilization and soft terms
in a variant of KKLT scenario, in which the visible sector K\"ahler modulus is
stabilized by the D-term potential of anomalous U(1) gauge symmetry.Comment: 30 pages, 5 figure
Classical conformal blocks from TBA for the elliptic Calogero-Moser
  system

The so-called Poghossian identities connecting the toric and spherical
blocks, the AGT relation on the torus and the Nekrasov-Shatashvili formula for
the elliptic Calogero-Moser Yang's (eCMY) functional are used to derive certain
expressions for the classical 4-point block on the sphere. The main motivation
for this line of research is the longstanding open problem of uniformization of
the 4-punctured Riemann sphere, where the 4-point classical block plays a
crucial role. It is found that the obtained representation for certain 4-point
classical blocks implies the relation between the accessory parameter of the
Fuchsian uniformization of the 4-punctured sphere and the eCMY functional.
Additionally, a relation between the 4-point classical block and the $N_f=4$,
${\sf SU(2)}$ twisted superpotential is found and further used to re-derive the
instanton sector of the Seiberg-Witten prepotential of the $N_f=4$, ${\sf
SU(2)}$ supersymmetric gauge theory from the classical block.Comment: 25 pages, no figures, latex+JHEP3, published versio
Dimensionally reduced SYM$_4$ at large-$N$: an intriguing Coulomb
  approximation

We consider the light-cone (LC) gauge and LC quantization of the dimensional
reduction of super Yang Mills theory from four to two dimensions. After
integrating out all unphysical degrees of freedom, the non-local LC Hamiltonian
exhibits an explicit ${\cal N}=(2,2)$ supersymmetry. A further SUSY-preserving
compactification of LC-space on a torus of radius $R$, allows for a large-$N$
numerical study where the smooth large-$R$ limit of physical quantities can be
checked. As a first step, we consider a simple, yet quite rich, "Coulomb
approximation" that maintains an ${\cal N}=(1,1)$ subgroup of the original
supersymmetry and leads to a non-trivial generalization of 't Hooft's model
with an arbitrary --but conserved-- number of partons. We compute numerically
the eigenvalues and eigenvectors both in momentum and in position space. Our
results, so far limited to the sectors with 2, 3 and 4 partons, directly and
quantitatively confirm a simple physical picture in terms of a string-like
interaction with the expected tension among pairs of nearest-neighbours along
the single-trace characterizing the large-$N$ limit. Although broken by our
approximation, traces of the full ${\cal N}=(2,2)$ supersymmetry are still
visible in the low-lying spectrum.Comment: 30 pages, 13 figures, Footnote page 3 replaced, Note Added at the
  end, 4 References adde
Intersections of thick Center Vortices, Dirac Eigenmodes and Fractional
  Topological Charge in SU(2) Lattice Gauge Theory

Intersections of thick, plane SU(2) center vortices are characterized by the
topological charge |Q|=1/2. We compare such intersections with the distribution
of zeromodes of the Dirac operator in the fundamental and adjoint
representation using both the overlap and asqtad staggered fermion formulations
in SU(2) lattice gauge theory. We analyze configurations with four
intersections and find that the probability density distribution of fundamental
zeromodes in the intersection plane differs significantly from the one obtained
analytically in [Phys.\ Rev.\ D 66, 85004 (2002)]. The Dirac eigenmodes are
clearly sensitive to the traces of the Polyakov (Wilson) lines and do not
exactly locate topological charge contributions. Although, the adjoint Dirac
operator is able to produce zeromodes for configurations with topological
charge |Q|=1/2, they do not locate single vortex intersections, as we prove by
forming arbitrary linear combinations of these zeromodes - their scalar density
peaks at least at two intersection points. With pairs of thin and thick
vortices we realize a situation similar to configurations with topological
charge |Q|=1/2. For such configurations the zeromodes do not localize in the
regions of fractional topological charge contribution but spread over the whole
lattice, avoiding regions of negative traces of Polyakov lines.Comment: 21 pages, 9 figure
Long Lived Fourth Generation and the Higgs

A chiral fourth generation is a simple and well motivated extension of the
standard model, and has important consequences for Higgs phenomenology. Here we
consider a scenario where the fourth generation neutrinos are long lived and
have both a Dirac and Majorana mass term. Such neutrinos can be as light as 40
GeV and can be the dominant decay mode of the Higgs boson for Higgs masses
below the W-boson threshold. We study the effect of the Majorana mass term on
the Higgs branching fractions and reevaluate the Tevatron constraints on the
Higgs mass. We discuss the prospects for the LHC to detect the semi-invisible
Higgs decays into fourth generation neutrino pairs. Under the assumption that
the lightest fourth generation neutrino is stable, it's thermal relic density
can be up to 20% of the observed dark matter density in the universe. This is
in agreement with current constraints on the spin dependent neutrino-neutron
cross section, but can be probed by the next generation of dark matter direct
detection experiments.Comment: v1: 19 pages, 5 figures; v2: References added; v3: version to appear
  in JHE
Anti de Sitter black holes and branes in dynamical Chern-Simons gravity:
  perturbations, stability and the hydrodynamic modes

Dynamical Chern-Simons (DCS) theory is an extension of General Relativity in
which the gravitational field is coupled to a scalar field through a parity
violating term. We study perturbations of anti-de Sitter black holes and branes
in such a theory, and show that the relevant equations reduce to a set of
coupled ODEs which can be solved efficiently through a series expansion. We
prove numerically that black holes and branes in DCS gravity are stable against
gravitational and scalar perturbations in the entire parameter space.
Furthermore, by applying the AdS/CFT duality, we relate black hole
perturbations to hydrodynamic quantities in the dual field theory, which is a
(2+1)-dimensional isotropic fluid with broken spatial parity. The Chern-Simons
term does not affect the entropy to viscosity ratio and the relaxation time,
but instead quantities that enter the shear mode at order q^4 in the small
momentum limit, for example the Hall viscosity and other quantities related to
second and third order hydrodynamics. We provide explicit corrections to the
gravitational hydrodynamic mode to first relevant order in the couplings.Comment: 9 pages, RevTeX
The Beta Ansatz: A Tale of Two Complex Structures

Brane tilings, sometimes called dimer models, are a class of bipartite graphs
on a torus which encode the gauge theory data of four-dimensional SCFTs dual to
D3-branes probing toric Calabi--Yau threefolds. An efficient way of encoding
this information exploits the theory of dessin d'enfants, expressing the
structure in terms of a permutation triple, which is in turn related to a Belyi
pair, namely a holomorphic map from a torus to a P^1 with three marked points.
The procedure of a-maximization, in the context of isoradial embeddings of the
dimer, also associates a complex structure to the torus, determined by the
R-charges in the SCFT, which can be compared with the Belyi complex structure.
Algorithms for the explicit construction of the Belyi pairs are described in
detail. In the case of orbifolds, these algorithms are related to the
construction of covers of elliptic curves, which exploits the properties of
Weierstrass elliptic functions. We present a counterexample to a previous
conjecture identifying the complex structure of the Belyi curve to the complex
structure associated with R-charges.Comment: 36 pages, 8 figure