954 research outputs found
Prospects for sgoldstino search at the LHC
In this paper we estimate the LHC sgoldstino discovery potential for the
signatures with gamma gamma and ZZ in a final state.Comment: 12 pages, 12 figures; journal version: minor change
Non-minimal Split Supersymmetry
We present an extension of the minimal split supersymmetry model, which is
capable of explaining the baryon asymmetry of the Universe. Instead of MSSM we
start from NMSSM and split its spectrum in such a way that the low energy
theory contains neutral particles, in addition to the content of minimal split
supersymmetry. They trigger the strongly first order electroweak phase
transition (EWPT) and provide an additional source of CP-violation. In this
model, we estimate the amount of the baryon asymmetry produced during EWPT,
using WKB approximation for CP-violating sources in diffusion equations. We
also examine the contribution of CP-violating interactions to the electron and
neutron electric dipole moments and estimate the production of the neutralino
dark matter. We find that both phenomenological and cosmological requirements
can be fulfilled in this model.Comment: 31 pages, 9 figures, typos correcte
Ultra-large distance modification of gravity from Lorentz symmetry breaking at the Planck scale
We present an extension of the Randall--Sundrum model in which, due to
spontaneous Lorentz symmetry breaking, graviton mixes with bulk vector fields
and becomes quasilocalized. The masses of KK modes comprising the
four-dimensional graviton are naturally exponentially small. This allows to
push the Lorentz breaking scale to as high as a few tenth of the Planck mass.
The model does not contain ghosts or tachyons and does not exhibit the van
Dam--Veltman--Zakharov discontinuity. The gravitational attraction between
static point masses becomes gradually weaker with increasing of separation and
gets replaced by repulsion (antigravity) at exponentially large distances.Comment: 28 page
Brane World Cosmological Perturbations
We consider a brane world and its gravitational linear perturbations. We
present a general solution of the perturbations in the bulk and find the
complete perturbed junction conditions for generic brane dynamics. We also
prove that (spin 2) gravitational waves in the great majority of cases can only
arise in connection with a non-vanishing anisotropic stress. This has far
reaching consequences for inflation in the brane world. Moreover, contrary to
the case of the radion, perturbations are stable.Comment: 16 pages, one figur
New hadrons as ultra-high energy cosmic rays
Ultra-high energy cosmic ray (UHECR) protons produced by uniformly
distributed astrophysical sources contradict the energy spectrum measured by
both the AGASA and HiRes experiments, assuming the small scale clustering of
UHECR observed by AGASA is caused by point-like sources. In that case, the
small number of sources leads to a sharp exponential cutoff at the energy
E<10^{20} eV in the UHECR spectrum. New hadrons with mass 1.5-3 GeV can solve
this cutoff problem. For the first time we discuss the production of such
hadrons in proton collisions with infrared/optical photons in astrophysical
sources. This production mechanism, in contrast to proton-proton collisions,
requires the acceleration of protons only to energies E<10^{21} eV. The diffuse
gamma-ray and neutrino fluxes in this model obey all existing experimental
limits. We predict large UHE neutrino fluxes well above the sensitivity of the
next generation of high-energy neutrino experiments. As an example we study
hadrons containing a light bottom squark. These models can be tested by
accelerator experiments, UHECR observatories and neutrino telescopes.Comment: 17 pages, revtex style; v2: shortened, as to appear in PR
Ultra-High Energy Neutrino Fluxes and Their Constraints
Applying our recently developed propagation code we review extragalactic
neutrino fluxes above 10^{14} eV in various scenarios and how they are
constrained by current data. We specifically identify scenarios in which the
cosmogenic neutrino flux, produced by pion production of ultra high energy
cosmic rays outside their sources, is considerably higher than the
"Waxman-Bahcall bound". This is easy to achieve for sources with hard injection
spectra and luminosities that were higher in the past. Such fluxes would
significantly increase the chances to detect ultra-high energy neutrinos with
experiments currently under construction or in the proposal stage.Comment: 11 pages, 15 figures, version published in Phys.Rev.
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