Thermalization After Inflation and Reheating Temperature

Details Thermalization After Inflation and Reheating Temperature Thermalization After Inflation and Reheating Temperature

2000-04-04

arxiv.org/abs/hep-ph/0004035v2

Phys.Rev. D62 (2000) 063509

Physics

High Energy Physics

High Energy Physics - Phenomenology

18 pages, LaTeX, a few references added and revised

Scientific paper

10.1103/PhysRevD.62.063509

We present a detailed examination of thermalization after inflation for perturbative inflaton decay. Different interactions among particles in the plasma of inflaton decay products are considered and it will be shown that 2 -> 2 scatterings and particle decay are the important ones. We show that thermalization occurs after decays dominate scatterings, and that depending on the typical mass scale of inflaton decay products, different situations may arise. In particular, thermalization may be delayed until late times, in which case the bounds from thermal gravitino production on supersymmetric models of inflation are considerably relaxed. We will also consider the case where the observable sector consists only of the MSSM matter content, and point out that flat directions with large vevs may result in earlier thermalization of the plasma and push the reheat temperature towards its upper limit.

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