Cosmology of Gravitino LSP Scenario with Right-Handed Sneutrino NLSP

Details Cosmology of Gravitino LSP Scenario with Right-Handed Sneutrino NLSP Cosmology of Gravitino LSP Scenario with Right-Handed Sneutrino NLSP

2007-10-19

arxiv.org/abs/0710.3624v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

Submitted for the SUSY07 proceedings, 4 pages, LaTeX, 1 eps figure

Scientific paper

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 lightest superparticles (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 the big-bang nucleosynthesis) are drastically relaxed in such a case. We will also consider the implication of such scenario to the structure formation.

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