Gravitino cosmology with a very light neutralino

It has been shown that very light or even massless neutralinos are consistent with all current experiments, given non-universal gaugino masses. Furthermore, a very light neutralino is consistent with astrophysical bounds from supernov{\ae} and cosmological bounds on dark matter. Here we study the cosmological constraints on this scenario from Big Bang nucleosynthesis taking gravitinos into account and find that a very light neutralino is even favoured by current observations.

Note:

9 pages, 3 figures

12.60.Jv
14.80.Ly
95.35.+d
26.35.+c
neutralino: massless
gravitino

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Figures(3)

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