Dr
Yudi Santoso
(University of Victoria)
30/07/2007, 14:00
Cosmology and Astrophysics
Parallel Talk
Gravitino has been shown as another viable candidate for dark matter from
supergravity models. Gravitino interacting very weakly with other particles, being
suppressed by the Planck mass, and as a consequence the Next Lightest Supersymmetric
Particle (NLSP) could have a very long lifetime, i.e. becomes a metastable particle.
Also because of this very weak interaction , gravitino would be...
Dr
Alejandro Ibarra
(DESY)
30/07/2007, 14:20
Cosmology and Astrophysics
Parallel Talk
We show that in the case of small R-parity and lepton number breaking couplings,
primordial nucleosynthesis, thermal leptogenesis and gravitino dark matter are
naturally consistent for gravitino masses m_{3/2} \gsim 5 GeV. The metastable
next-to-lightest superparticle has a decay length that is typically larger than a few
centimeters, with characteristic signatures at the LHC. The photon...
Mr
Josef Pradler
(Max-Planck-Institut für Physik)
30/07/2007, 14:40
Cosmology and Astrophysics
Parallel Talk
Considering gravitino dark matter scenarios, we study constraints on the reheating
temperature of inflation. Within the framework of the constrained minimal
supersymmetric Standard Model (CMSSM), we find a maximum reheating temperature of
about 10^7 GeV taking into account bound-state effects on the primordial 6Li
abundance. We show that late-time entropy production can relax this...
Dr
Gilbert Moultaka
(LPTA-Montpellier, UMR5207-UM2/IN2P3/CNRS)
30/07/2007, 15:00
Cosmology and Astrophysics
Parallel Talk
In gauge mediated supersymmetry breaking models the relatively light
messenger and/or secluded sectors can be partly present in the early
universe, depending on the value of the reheat temperature. In particular, a
relic stable lightest messenger scalar field with a mass greater than a few
tens of TeV would typically lead to an overcloser problem. Relying on a
recently studied ...
Mr
Koji Ishiwata
(Department of Physics,Tohoku University)
30/07/2007, 15:20
Cosmology and Astrophysics
Parallel Talk
We consider supersymmetric model with right-handed (s)neutrinos where
the neutrino masses are purely Dirac type. We discuss cosmology based
on such a scenario, paying particular attention to the case that the
gravitino is the LSP while the right-handed sneutrino is the next-LSP.
It will be shown that the cosmological constraints on the
gravitino-LSP scenario (in particular, those from...
Dr
Vassilis Spanos
(University of Patras)
30/07/2007, 15:40
Cosmology and Astrophysics
Parallel Talk
We will be discussing the scenario that the gravitino
is the lightest supersymmetric particle and the
long-lived next-to-lightest sparticle (NSP) is either the neutralino
or the stau. We calculate the dominant two- and three-body decays of both
neutralino and stau NSPs, and model the electromagnetic and hadronic decay
products using the PYTHIA event generator and a cascade equation. ...
