Cosmic Ray Signatures from Decaying Gravitino Dark Matter

TL;DR

This paper explores how decaying gravitino dark matter with R-parity violation can explain recent cosmic ray electron and positron anomalies, and predicts future gamma-ray signatures for testing.

Contribution

It demonstrates that LLE type operators in gravitino decay models can account for cosmic ray anomalies without conflicting with existing bounds.

Findings

LLE operators can explain PAMELA, ATIC, Fermi LAT anomalies

Scenario predicts detectable gamma-ray emission

Model remains consistent with current observational constraints

Abstract

We study the charged cosmic rays arising from the slow decay of gravitino dark matter within supersymmetric scenarios with trilinear R-parity violation. It is shown that operators of the LLE type can very well account for the recent anomalies in cosmic ray electron and positron data reported by PAMELA, ATIC and Fermi LAT, without violating any other bounds. This scenario will soon be tested by the Fermi LAT data on diffuse gamma ray emission.