Antideuterons from Decaying Gravitino Dark Matter

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.

arXiv comment28 pages, 14 figures, pdfLaTeX; addition of figure 7, minor extension of discussion, results unchanged, agrees with published version

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• Alternative coalescence model for deuteron, tritium, helium-3 and their antinuclei
• Revisiting cosmic ray antinuclei fluxes with a new coalescence model
• On nuclear coalescence in small interacting systems
• Confronting recent AMS-02 positron fraction and Fermi-LAT Extragalactic Gamma-Ray Background measurements with gravitino dark matter