Soft Leptogenesis and Gravitino Dark Matter in Gauge Mediation

TL;DR

This paper explores how soft leptogenesis within gauge mediated supersymmetry models can simultaneously account for the universe's baryon asymmetry and gravitino dark matter, proposing a specific model to generate necessary A-terms.

Contribution

It introduces a scenario where enhanced A-terms enable successful soft leptogenesis compatible with gravitino dark matter in gauge mediation models.

Findings

Can explain baryon asymmetry with gravitino mass between MeV and GeV

Proposes an explicit model for inducing the A-term

Compatible with existing cosmological constraints

Abstract

We study soft leptogenesis in gauge mediated supersymmetry breaking models with an enhanced A-term for the right-handed neutrino. We find that this scenario can explain the baryon asymmetry of the present universe, consistently with the gravitino dark matter for a wide range of gravitino mass m_{3/2}=O(MeV)-O(GeV). We also propose an explicit model which induces the necessary A-term for the right-handed neutrino.