Antideuterons from decaying gravitino dark matter

Abstract

From the point of view of Dark Matter searches, antideuteron are an interesting species of cosmic rays. In the past eighteen years much progress has been done in the understanding of these cosmic rays but this did not translate into experimental efforts to actually detect these particles. In this work, starting from a specific case of dark matter candidate with relatively generic features, we study some sources of theoretical uncertainties and show that the margin of improvement beyond the limits already set by cosmic-ray antiproton are quite narrow and anyway unachievable for the next generation of experiments.