Gravitino Dark Matter

Details Gravitino Dark Matter Gravitino Dark Matter

2009-10-09

arxiv.org/abs/0910.1870v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages, 6 figures, Talk at SUSY09, Boston

Scientific paper

Gravitino dark matter, together with thermal leptogenesis, implies an upper bound on the masses of superparticles. In the case of broken R-parity the constraints from primordial nucleosynthesis are naturally satisfied and decaying gravitinos lead to characteristic signatures in high energy cosmic rays. Electron and positron fluxes from gravitino decays cannot explain both, the PAMELA positron fraction and the electron + positron flux recently measured by Fermi LAT. The observed fluxes require astrophysical sources. The measured antiproton flux allows for a sizable contribution of decaying gravitinos to the gamma-ray spectrum, in particular a line at an energy below 300 GeV.

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