Probing Gravitino Dark Matter with PAMELA and Fermi
arXiv:0906.1187 · doi:10.1088/1475-7516/2009/09/021
Abstract
We analyze the cosmic-ray signatures of decaying gravitino dark matter in a model independent way based on an operator analysis. Thermal leptogenesis and universal boundary conditions at the GUT scale restrict the gravitino mass to be below 600 GeV. Electron and positron fluxes from gravitino decays, together with the standard GALPROP background, cannot explain both, the PAMELA positron fraction and the electron + positron flux recently measured by Fermi LAT. For gravitino dark matter, 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. Future measurements of the gamma-ray flux will provide important constraints on possible signatures of decaying gravitino dark matter at the LHC.
21 pages, 6 figures. v3: published version
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Cited by in corpus (7)
- Indirect detection of gravitino dark matter including its three-body decays
- Broken R-Parity in the Sky and at the LHC
- New decay modes of gravitino dark matter
- Probing dark matter models with neutrinos from the Galactic center
- Reconciling thermal leptogenesis with the gravitino problem in SUSY models with mixed axion/axino dark matter
- Gamma-rays from Nearby Clusters: Constraints on Selected Decaying Dark Matter Models
- Dynamical R-parity Breaking at the LHC