Gravitino Dark Matter and Light Gluino in an R-invariant Low Scale Gauge Mediation

Understand

We consider the simplest class of the R-invariant gauge mediation model with the gravitino mass in the one to ten keV range.

• We show that the entropy production from the supersymmetry breaking sector makes the gravitino into a warm dark matter candidate.
• We also discuss that the gluino mass can be lighter than the wino mass even when the messenger sector satisfies the GUT relations at the GUT scale.