SUSY07

Session

Cosmology 7

Cos7

30 Jul 2007, 14:00

Physics Building (Karlsruhe University)

148. Gravitino Dark Matter with Stop as the NLSP

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...

190. Gravitino dark matter with broken R-parity

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...

213. Gravitino Dark Matter and Constraints on the Reheating Temperature

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...

269. The dark matter as a light gravitino

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 ...

288. Cosmology of Gravitino LSP Scenario with Right-Handed Sneutrino NLSP

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...

331. Gravitino Dark Matter

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. ...