SIMP dark matter and its cosmic abundances

Abstract

We give a review on the thermal average of the annihilation cross-sections for $3\to 2$ and general higher-order processes. Thermal average of higher order annihilations highly depend on the velocity of dark matter, especially, for the case with resonance poles. We show such examples for scalar dark matter in gauged $Z_3$ models.

Comments: 5 pages, 2 figures, Prepared for the proceedings of the 13th International Conference on Gravitation, 3-7 July 2017