Inflation in Gauge Mediation and Gravitino Dark Matter

TL;DR

This paper proposes an inflationary model within gauge mediation frameworks where late-time entropy production from pseudomoduli decay can solve the gravitino overproduction problem, making gravitinos viable dark matter candidates.

Contribution

It introduces a novel inflation scenario in gauge mediation models with a mechanism for gravitino dark matter through pseudomoduli decay and entropy production.

Findings

Late-time entropy production dilutes gravitinos effectively.

Gravitinos produced from pseudomoduli decay can account for dark matter.

Model parameter space exists where gravitinos are the dominant dark matter component.

Abstract

We present an inflationary scenario based on a phenomenologically viable model with direct gauge mediation of low-scale supersymmetry breaking. Inflation can occur in the supersymmetry-breaking hidden sector. Although the reheating temperature from the inflaton decay is so high that the gravitino problem seems to be severe, late time entropy production from the decay of the pseudomoduli field associated with the supersymmetry breaking can dilute gravitinos sufficiently. We show that gravitinos are also produced from the pseudomoduli decay and there is a model parameter space where gravitinos can be the dark matter in the present universe.