Indirect searches for gravitino dark matter

TL;DR

This paper explores how gravitino dark matter with small R-parity violation could decay into cosmic rays, and how these signals can be used to constrain the model's parameters.

Contribution

It analyzes the potential cosmic-ray signals from gravitino decay and compares them with observational data to set constraints on the model.

Findings

Cosmic-ray data can constrain gravitino decay parameters.

Decaying gravitino dark matter produces detectable gamma rays, positrons, antiprotons, antideuterons, and neutrinos.

The scenario is consistent with cosmological observations like BBN and leptogenesis.

Abstract

The gravitino in models with a small violation of R-parity is a well-motivated decaying dark matter candidate that leads to a cosmological scenario that is consistent with big bang nucleosynthesis and thermal leptogenesis. The gravitino lifetime is cosmologically long-lived since its decays are suppressed by the Planck-scale as well as the small R-parity violating parameter. We discuss the signals in different cosmic-ray species coming from the decay of gravitino dark matter, namely gamma rays, positrons, antiprotons, antideuterons and neutrinos. Comparison to cosmic-ray data can be used to constrain the parameters of the model.