Particle Production and Gravitino Abundance after Inflation

Details Particle Production and Gravitino Abundance after Inflation Particle Production and Gravitino Abundance after Inflation

1995-11-21

arxiv.org/abs/hep-ph/9511381v1

Phys.Rev. D54 (1996) 2494-2503

Physics

High Energy Physics

High Energy Physics - Phenomenology

23 pages + 13 figures

Scientific paper

10.1103/PhysRevD.54.2494

Thermal history after inflation is studied in a chaotic inflation model with supersymmetric couplings of the inflaton to matter fields. Time evolution equation is solved in a formalism that incorporates both the back reaction of particle production and the cosmological expansion. The effect of the parametric resonance gives rise to a rapid initial phase of the inflaton decay followed by a slow stage of the Born term decay. Thermalization takes place immediately after the first explosive stage for a medium strength of the coupling among created particles. As an application we calculate time evolution of the gravitino abundance that is produced by ordinary particles directly created from the inflaton decay, which typically results in much more enhanced yield than what a naive estimate based on the Born term would suggest.

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