Non-thermal leptogenesis and gravitino problem in inflaton decay

Understand

In the present work we discuss baryon asymmetry in the non-thermal leptogenesis scenario and gravitino cosmology for an unstable gravitino with inflaton decay.

• We take into account two production mechanisms for gravitino, namely thermal production and inflaton decay.
• We wish to show in plots the allowed parameter space so that the BBN constraint and the requirement for the right baryon asymmetry are satisfied at the same time.
• However our analysis shows that it is impossible to achieve both goals simultaneously.