Gravitino Dark Matter with Weak-Scale Right-Handed Sneutrino

Details Gravitino Dark Matter with Weak-Scale Right-Handed Sneutrino Gravitino Dark Matter with Weak-Scale Right-Handed Sneutrino

2007-10-16

arxiv.org/abs/0710.2968v2

Phys.Rev.D77:035004,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

18 pages, 6 figures

Scientific paper

10.1103/PhysRevD.77.035004

We consider cosmological implications of supersymmetric models with right-handed (s)neutrinos where the neutrino masses are purely Dirac-type. We pay particular attention to the case where gravitino is the lightest superparticle while one of the right-handed sneutrinos is next-to-the-lightest superparticle. We study constraints from big-bang nuleosynthesis and show that the constraints could be relaxed compared to the case without right-handed sneutrinos. As a result, the gravitino-dark-matter scenario becomes viable with relatively large value of the gravitino mass. We also discuss constraints from the structure formation; in our model, the free-streaming length of the gravitino dark matter may be as long as O(1 Mpc), which is comparable to the present observational upper bound on the scale of free-streaming.

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