Gravitino production in an inflationary Universe and implications for leptogenesis
arXiv:hep-ph/0606228 · doi:10.1142/S0217732308024213
Abstract
Models of leptogenesis are constrained by the low reheat temperature at the end of reheating associated with the gravitino bound. However a detailed view of reheating, in which the maximum temperature during reheating, $\Tmax$, can be orders of magnitude higher than the reheat temperature, allows for the production of heavy Majorana neutrinos needed for leptogenesis. But then one must also consider the possibility of enhanced gravitino production in such scenarios. In this article we consider gravitino production during reheating, its dependence on $\Tmax$, and its relevance for leptogenesis. Earlier analytical studies of the gravitino abundance have only considered gravitino production in the post-reheating radiation dominated era. We find that the gravitino abundance generated during reheating is comparable to that generated after reheating. This lowers the upper bound on the reheat temperature by a factor of 4/3.
arXiv commentJournal version, minor change in title, 13 pages (revtex), 2 eps figures
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- Perturbative Reheating and Gravitino Production in Inflationary Models
- Galileogenesis: A new cosmophenomenological zip code for reheating through R-parity violating coupling
- Nonthermal violation in soft leptogenesis
- (N)LSP Decays and Gravitino Dark Matter Relic Abundance in Big Divisor (nearly) SLagy D3/D7 mu-Split SUSY
- Gravitino production in a thermal Universe revisited
- Kinetic and chemical equilibrium of the Universe and gravitino production
- Naturalness in Soft Leptogenesis and Gravitino Mass Bound due to Primordial Black Holes
- Supersymmetric flat directions and resonant gravitino production