Gravitino Dark Matter in Split Supersymmetry with Bilinear R-Parity Violation
arXiv:1406.2368 · doi:10.1140/epjc/s10052-014-3138-2
Abstract
In Split-SUSY with BRpV we show that the Gravitino DM solution is consistent with experimental evidence on its relic density and life time. We arrive at this conclusion by performing a complete numerical and algebraic study of the parameter space, including constraints from the recently determined Higgs mass, updated neutrino physics, and BBN constraints on NLSP decays. The Higgs mass requires a relatively low Split-SUSY mass scale, which is naturally smaller than usual values for reheating temperature, allowing the use of the standard expression for the relic density. We include restrictions from neutrino physics with three generations, and notice that the gravitino decay width depends on the atmospheric neutrino mass scale. We calculate the neutralino decay rate and find it consistent with BBN. We mention some implications on indirect DM searches.
arXiv comment35 pages, 7 figures. References added, typos corrected and experimental constraints updated. Some clarifications added in Section 2. Version to appear in EPJC
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