Seminarium Kosmologia i Fizyka Cząstek

In models with resonantly enhanced dark matter annihilation, the coupling of dark sector to the visible one is suppressed with respect to non-resonant scenarios. Consequently the cross section for scattering of dark matter on light states in the thermal bath is diminished and temperatures of the kinetic and chemical decoupling are similar. Moreover, due to the resonance enhancement, dark matter annihilation cross-section has large temperature dependence and is still effective, even then both sectors are decoupled. This leads to the interesting interplay between dark matter temperature and density. The resulting modifications of dark matter relic abundance will be presented alongside the consequences for direct and indirect detection and dark matter self-interactions.