R-parity Violating Right-Handed Neutrino in Gravitino Dark Matter Scenario
arXiv:0903.1813 · doi:10.1088/1126-6708/2009/09/037
Abstract
A decay of the gravitino dark matter is an attractive candidate to explain the current excesses of the PAMELA/ATIC cosmic-ray data. However, R-parity violations are required to be very tiny in low-energy scale. We suggest a R-parity violation in the right-handed neutrino sector. The violation is suppressed by a see-saw mechanism. Although a reheating temperature is constrained from above, the thermal leptogenesis is found to work successfully with a help of the R-parity violating right-handed neutrino.
13 pages, 1 figure