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

TL;DR

This paper explores how bilinear R-parity violation can explain neutrino masses and make the gravitino a decaying dark matter candidate, with observable gamma-ray signals and implications for collider experiments.

Contribution

It identifies the parameter space where gravitino dark matter is consistent with neutrino data and astrophysical constraints, linking particle physics with cosmological observations.

Findings

Limits on gravitino mass around 1-10 GeV.

Reheat temperature constrained to a few times 10^7-10^8 GeV.

Potential to reconstruct neutrino parameters at colliders.

Abstract

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 $m_{\tilde G} \lsim$ 1-10 GeV corresponding to a relatively low reheat temperature $T_R \lsim$ few $\times 10^7-10^8$ GeV. Neutrino mass and mixing parameters may be reconstructed at accelerator experiments like the Large Hadron Collider.