Gravitino Dark Matter in R-Parity Breaking Vacua
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.
Keywords
Cite
@article{arxiv.hep-ph/0702184,
title = {Gravitino Dark Matter in R-Parity Breaking Vacua},
author = {Wilfried Buchmuller and Laura Covi and Koichi Hamaguchi and Alejandro Ibarra and Tsutomu Yanagida},
journal= {arXiv preprint arXiv:hep-ph/0702184},
year = {2010}
}
Comments
18 pages. Typos corrected