Gravitino Production Suppressed by Dynamics of Sgoldstino

Understand

In supersymmetric theories, the gravitino is abundantly produced in the early Universe from thermal scattering, resulting in a strong upper bound on the reheat temperature after inflation.

• We point out that the gravitino problem may be absent or very mild due to the early dynamics of a supersymmetry breaking field, i.e.
• a sgoldstino.
• In models of low scale mediation, the field value of the sgoldstino determines the mediation scale and is in general different in the early Universe from the present one.