Non-thermal Gravitino Dark Matter in Gauge Mediation

TL;DR

This paper proposes a scenario where gravitinos produced from the decay of a supersymmetry breaking scalar field can account for dark matter, with specific mass ranges ensuring cosmological viability in gauge mediation models.

Contribution

It introduces a novel mechanism for gravitino dark matter production via pseudo-moduli decay, analyzing decay processes and cosmological constraints in gauge mediation.

Findings

Viable dark matter scenario with gravitino mass ~10-100 MeV.

Pseudo-moduli mass around 100 GeV supports cosmological viability.

Detailed decay and constraint analysis for real and imaginary components.

Abstract

We show that gravitinos produced by decays of a supersymmetry breaking scalar field (the pseudo-moduli field) can naturally explain the observed abundance of dark matter in a certain class of the gauge mediation models. We study the decay processes as well as cosmological constraints on this scenario in detail, particularly focusing on different behavior of the real and imaginary components of the pseudo-moduli field. Cosmologically viable scenario emerges when the gravitino and the pseudo-moduli masses are O(10-100) MeV and O(100) GeV, respectively.