Gravitino Dark Matter and Neutrino Masses in Partial Split Supersymmetry

TL;DR

This paper explores how Partial Split Supersymmetry with R-parity violation can simultaneously explain neutrino masses and provide a gravitino dark matter candidate, deriving constraints from astrophysical observations and neutrino data.

Contribution

It demonstrates that a unified model can account for neutrino physics and gravitino dark matter, establishing a mass limit consistent with experimental searches.

Findings

Derived a stringent upper limit on gravitino mass from astrophysical and neutrino data.

Showed compatibility of gravitino dark matter with neutrino mass generation in the model.

Constrained gravitino decay signatures within astrophysical photon spectra.

Abstract

Partial Split Supersymmetry with bilinear R-parity violation allows to reproduce all neutrino mass and mixing parameters. The viable dark matter candidate in this model is the gravitino. We study the hypothesis that both possibilities are true: Partial Split Supersymmetry explains neutrino physics and that dark matter is actually composed of gravitinos. Since the gravitino has a small but non-zero decay probability, its decay products could be observed in astrophysical experiments. Combining bounds from astrophysical photon spectra with the bounds coming from the mass matrix in the neutrino sector we derive a stringent upper limit for the allowed gravitino mass. This mass limit is in good agreement with the results of direct dark matter searches.