Light Gravitinos as Mixed Dark Matter

Details Light Gravitinos as Mixed Dark Matter Light Gravitinos as Mixed Dark Matter

1996-05-03

arxiv.org/abs/hep-ph/9605222v1

Phys.Lett. B386 (1996) 189-197

Physics

High Energy Physics

High Energy Physics - Phenomenology

18 pages, LaTeX, no figure

Scientific paper

10.1016/0370-2693(96)00956-2

In theories with a gauge-mediated mechanism of supersymmetry breaking the gravitino is likely to be the lightest superparticle and, hence, a candidate for dark matter. We show that the decay of the next-to-lightest superparticle into a gravitino can yield a non-thermal population of gravitinos which behave as a hot dark matter component. Together with the warm component, which is provided by the population of gravitinos of thermal origin, they can give rise to viable schemes of mixed dark matter. This realization has some specific and testable features both in particle physics and astrophysics. We outline under which conditions the mechanism remains viable even when R parity is broken.

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