Leptogenesis, Gravitino Dark Matter and Entropy Production

Details Leptogenesis, Gravitino Dark Matter and Entropy Production Leptogenesis, Gravitino Dark Matter and Entropy Production

2010-08-10

arxiv.org/abs/1008.1740v3

Phys.Rev.D82:115029,2010

Physics

High Energy Physics

High Energy Physics - Phenomenology

28 pages, 3 figures; v2: references updated, changes in presentation including some generalization, results and conclusions un

Scientific paper

10.1103/PhysRevD.82.115029

Many extensions of the Standard Model predict super-weakly interacting particles, which typically have to decay before Big Bang Nucleosynthesis (BBN). The entropy produced in the decays may help to reconcile thermal leptogenesis and BBN in scenarios with gravitino dark matter, which is usually difficult due to late decays of the next-to-lightest supersymmetric particle (NLSP) spoiling the predictions of BBN. We study this possibility for a general neutralino NLSP. We elaborate general properties of the scenario and strong constraints on the entropy-producing particle. As an example, we consider the saxion from the axion multiplet and show that, while enabling a solution of the strong CP problem, it can also produce a suitable amount of entropy.

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