Spontaneous baryogenesis in warm inflation

Abstract

We discuss spontaneous baryogenesis in the warm inflation scenario. In contrast with standard inflation models, radiation always exists in the warm inflation scenario, and the inflaton must be directly coupled to it. Also, the transition to the post-inflationary radiation dominated phase is smooth and the entropy is not significantly increased at the end of the period of inflation. In addition, after the period of warm inflation ends, the inflaton does not oscillate coherently but slowly rolls. We show that as a consequence of these features of warm inflation, the scenario can well accommodate the spontaneous baryogenesis mechanism, provided that the decoupling temperature $T_{D}$ of the baryon or the $B-L$ violating interactions is higher than the temperature of radiation during the late stages of inflation.