Speaker
Dr
Takahiro Terada
(Institute for Basic Science)
Description
In the ''Minimal Supergravity Inflation'', whose only degrees of freedom are the (real) inflaton, gravitino, and graviton, an issue of the catastrophic production of slow gravitinos after inflation has been reported. We will briefly comment on the origin of such catastrophic production and propose an alternative model with the same physical degrees of freedom that is free from the issue. We utilize a cubic nilpotent superfield to realize it and demonstrate that inflation is possible in this framework. However, even though there is no issue of gravitino production related to the sound-speed change, the standard gravitino problem turns out to be severe.
Author
Dr
Takahiro Terada
(Institute for Basic Science)
