Abstract
We reconsidered leptogenesis scenario from right-handed (s)neutrino produced by the decay of inflaton.Besides the well-investigated case that the neutrino decays instantaneously after the production, leptogenesis is possible if neutrino decays after it dominates the universe.In the latter case, right-handed (s)neutrino can decay either while it is relativisticor after it becomes non-relativistic.Especially, the first case has not been discussed seriously in literatures.Resultant lepton asymmetry and constraints from the gravitino problem are studied in broad parameter region,including all cases of this scenario.It is also shown how this leptogenesis scenario depends on the parameters,the inflaton decay rate (the reheating temperature), the right-handed neutrino mass,the washout parameter, and the constraint from the gravitino problem.Leptogenesis from relativistic neutrino decay is interesting because both thermal and non-thermal gravitino problems can be relaxed.
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