Mar Bastero-Gil, Arjun Berera, Rudnei O. Ramos, Joao G. Rosa
In generic particle physics models, the inflaton field is coupled to other bosonic and fermionic fields that acquire large masses during inflation and may decay into light degrees of freedom. This leads to dissipative effects that modify the inflationary dynamics and generate a nearly-thermal radiation bath, such that inflation occurs in a warm rather than supercooled environment. In this work, we perform a numerical computation and obtain expressions for the associated dissipation coefficient, focusing on the regime where the radiation temperature is below the heavy mass threshold, while allowing for generic couplings and field multiplicities. We also discuss radiative corrections to particle masses and decay widths and how they may significantly increase the effects of dissipation.
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http://arxiv.org/abs/1207.0445
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