http://arxiv.org/abs/1806.01865
At the end of inflation, the inflaton field decays into an initially non-thermal population of relativistic particles which eventually thermalize. We consider the production of dark matter from this relativistic plasma, focusing on the pre-thermal phase. We find that for a production cross-section $\sigma(E)\sim E^n$ with $n> 2$, the present dark matter abundance is produced during the pre-thermal phase of its progenitors. For $n\le 2$, entropy production during reheating makes the non-thermal contribution to the present dark matter abundance sub-dominant compared to that produced thermally. As specific examples, we verify that the non-thermal contribution is irrelevant for gravitino production in low scale supersymmetric models ($n=0$), and is dominant for gravitino production in high scale supersymmetry models ($n=6$).
M. Garcia and M. Amin
Thu, 7 Jun 18
45/51
Comments: 11 pages, 4 figures
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