Resonant SIMP dark matter

Soo-Min Choi; Hyun Min Lee

doi:10.1016/j.physletb.2016.04.055

paper

Resonant SIMP dark matter

arXiv:1601.03566 · doi:10.1016/j.physletb.2016.04.055

Abstract

We consider a resonant SIMP dark matter in models with two singlet complex scalar fields charged under a local dark $U (1)_{D}$ . After the $U (1)_{D}$ is broken down to a $Z_{5}$ discrete subgroup, the lighter scalar field becomes a SIMP dark matter which has the enhanced $3 \to 2$ annihilation cross section near the resonance of the heavier scalar field. Bounds on the SIMP self-scattering cross section and the relic density can be fulfilled at the same time for perturbative couplings of SIMP. A small gauge kinetic mixing between the SM hypercharge and dark gauge bosons can be used to make SIMP dark matter in kinetic equilibrium with the SM during freeze-out.

14 pages, 5 figures, Improved discussion on thermal-averaged annihilation cross section