ACP Seminar (Astronomy - Cosmology - Particle Physics)

Speaker: Hiroshi takano (Kavli IPMU)
Title: Multicomponent scenario of WIMP dark matter in the radiative seesaw models
Date (JST): Wed, Apr 30, 2014, 13:30 - 15:00
Place: Seminar Room A
Abstract: The existence of dark matter is almost certain from the cosmological observation. But it is unknown whether dark matter consists of single-component or multi-component. We consider Z_2 x Z_2 symmetry as a simple example of the symmetry stabilizing several dark matter particles. In this case, the dark matter annihilation can be classified to three types, standard annihilation, dark matter conversion, and semiannihilation. In this talk, we consider the general expression of Z_2 x Z_2 conserving model and discuss about the effects of the non-standard annihilation processes to their thermal relic densities. And I will introduce some examples of radiative seesaw model as multicomponent dark matter existing scenario.