Speaker
Dr
Alejandro Ibarra
(DESY)
Description
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. 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.
Author
Dr
Alejandro Ibarra
(DESY)
