Decaying gravitino dark matter and an upper bound on the gluino mass

TL;DR

This paper explores how decaying gravitino dark matter can explain cosmic-ray anomalies and derives upper bounds on the gluino mass and reheating temperature, with implications for LHC detectability.

Contribution

It provides a novel connection between gravitino dark matter decay, cosmic-ray anomalies, and constraints on gluino mass and reheating temperature.

Findings

Gluino mass constrained from above, potentially within LHC reach.

Reheating temperature also constrained, affecting early universe models.

Dark matter decay explains cosmic-ray electron and positron excesses.

Abstract

We show that, if decaying gravitino dark matter is responsible for the PAMELA and ATIC/PPB-BETS anomalies in the cosmic-ray electron and positron fluxes, both a reheating temperature and a gluino mass are constrained from above. In particular, the gluino mass is likely within the reach of LHC, if the observed baryon asymmetry is explained by thermal leptogenesis scenario.