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Institute for the Physics and Mathematics of the UniverseWPI

IPMU Subgroup Seminar

Date: June 26, 2008, 13:30 - 15:00
Place: Room 633, 6th floor, Research Centers Building, Kashiwa Campus of the University of Tokyo
Speaker: Shigeki Matsumoto (University of Toyama)
Title: Weak Scale Gravitino Dark Matter [PDF]
Abstract: Cosmology of the gravitino dark matter having a weak scale mass is discussed. It is known that such a gravitino scenario is severely constrained by the Big-Bang nucleosynthesis. Once we consider a mechanism to avoid the constraints such as (i) introduction of the weak scale right-handed sneutrino and (ii) introduction of the tiny R-parity violating interactions, cosmology of the scenario is drastically changed. We show that the small structure problem of the universe can be solved in the case (i), while gamma (EGRET) and positron (HEAT) anomalies in cosmic ray observations can be solved simultaneously in the case (ii).
Reference: arXiv:0805.1133 [hep-ph]