Gravitino Dark Matter and Neutrino Masses in Partial Split Supersymmetry

Details Gravitino Dark Matter and Neutrino Masses in Partial Split Supersymmetry Gravitino Dark Matter and Neutrino Masses in Partial Split Supersymmetry

2011-06-01

arxiv.org/abs/1106.0308v2

Phys.Rev.D84:055007,2011

Physics

High Energy Physics

High Energy Physics - Phenomenology

22 pages, 3 figures

Scientific paper

10.1103/PhysRevD.84.055007

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.

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