Gravitino Dark Matter with Entropy Production constrained by Big Bang Nucleosynthesis

Abstract

We are looking at a gravitino dark matter scenario with a general neutralino next-to-lightest supersymmetric particle. We are considering the primary decay channels of the neutralino, and we define the supersymmetric parameters in the high energy regime. We compare with the bounds enforced by big bang nucleosynthesis, and we compare with models defined in the low energy regime. Then, we introduce early universe entropy production and see how the available parameter space is affected. Finally, we discuss the limits on the gravitino mass and how they coincide with the current dark matter observations.