Gravitino dark matter and neutrino masses with bilinear R-parity violation.

Bilinear R-parity violation provides an attractive origin for neutrino masses and mixings. In such schemes the gravitino is a viable decaying dark matter particle whose R-parity violating decays lead to monochromatic photons with rates accessible to astrophysical observations. We determine the parameter region allowed by gamma-ray line searches, dark matter relic abundance, and neutrino oscillation data, obtaining a limit on the gravitino mass mG ≲ 1-10 GeV corresponding to a relatively low reheat temperature TR ≲ few X 107-108 GeV. Neutrino mass and mixing parameters may be reconstructed at accelerator experiments like the Large Hadron Collider. [ABSTRACT FROM AUTHOR]