Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2006-06-21
Mod.Phys.Lett.A23:427-436,2008
Physics
High Energy Physics
High Energy Physics - Phenomenology
Journal version, minor change in title, 13 pages (revtex), 2 eps figures
Scientific paper
10.1142/S0217732308024213
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.
Rangarajan Raghavan
Sahu Narendra
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