Neutrino Signals from Gravitino Dark Matter with Broken R-Parity

Understand

The gravitino is a promising supersymmetric dark matter candidate, even without strict R-parity conservation.

• In fact, with some small R-parity violation, gravitinos are sufficiently long-lived to constitute the dark matter of the universe, while the resulting cosmological scenario is consistent with primordial nucleosynthesis and the high reheating temperature needed for thermal leptogenesis.
• Furthermore, in this scenario the gravitino is unstable and might thus be accessible by indirect detection via its decay products.
• We compute in this thesis the partial decay widths for the gravitino in models with bilinear R-parity breaking.