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arXiv · hep-ph/0702184

Gravitino Dark Matter in R-Parity Breaking Vacua

Wilfried Buchmuller·Laura Covi·Koichi Hamaguchi·Alejandro Ibarra·Tsutomu Yanagida
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Abstract

We show that in the case of small R-parity and lepton number breaking couplings, primordial nucleosynthesis, thermal leptogenesis and gravitino dark matter are naturally consistent for gravitino masses m_{3/2} \gsim 5 GeV. We present a model where R-parity breaking is tied to B-L breaking, which predicts the needed small couplings. The metastable next-to-lightest superparticle has a decay length that is typically larger than a few centimeters, with characteristic signatures at the LHC. The photon flux produced by relic gravitino decays may be part of the apparent excess in the extragalactic diffuse gamma-ray flux obtained from the EGRET data for a gravitino mass m_{3/2} \sim 10 GeV. In this case, a clear signal can be expected from GLAST in the near future.

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Wilfried Buchmuller, Laura Covi, Koichi Hamaguchi, Alejandro Ibarra, Tsutomu Yanagida. 2008-10-27. Gravitino Dark Matter in R-Parity Breaking Vacua. https://doi.org/10.1088/1126-6708%2F2007%2F03%2F037

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