Retrofitted Gravity Mediation without the Gravitino-overproduction Problem

Endo, Motoi; Takahashi, Fuminobu; Yanagida, T. T.

Retrofitted Gravity Mediation without the Gravitino-overproduction Problem

Authors

Endo, Motoi

Takahashi, Fuminobu

Yanagida, T. T.

Description

We propose a retrofitted gravity mediation model which alleviates the gravitino overproduction from decays of an inflaton and a supersymmetry breaking field. In the model, we introduce an approximate U(1) symmetry under which the supersymmetry breaking field is charged, although it is broken by a mass term of messenger fields to generate gaugino masses of order the weak scale. In a low-scale inflation model, we find regions in which the gravitino overproduction problem is avoided.
24 pages, 3 figures