Antideuterons from Decaying Gravitino Dark Matter

TL;DR

This paper evaluates the potential of cosmic-ray antideuteron detection to improve constraints on gravitino dark matter lifetime, finding limited prospects for current experiments but identifying promising energy ranges for future searches.

Contribution

It provides a detailed analysis of antideuteron production from gravitino decay, considering uncertainties, and assesses the feasibility of improving dark matter constraints.

Findings

Limited improvement over existing antiproton constraints.

Identifies promising energy ranges for future antideuteron detection.

Highlights the impact of theoretical uncertainties on detection prospects.

Abstract

We study the possibility of improving the constraints on the lifetime of gravitino dark matter in scenarios with bilinear R-parity violation by estimating the amount of cosmic-ray antideuterons that can be produced in gravitino decays. Taking into account all different sources of theoretical uncertainties, we find that the margin of improvement beyond the limits already set by cosmic-ray antiproton data are quite narrow and unachievable for the next generation of experiments. However, we also identify more promising energy ranges for future experiments.