An asymmetric SIMP dark matter model

Journal of High Energy Physics

Regular Article - Theoretical Physics

Shu-Yu Ho¹ 

[1] Korea Institute for Advanced Study, 02455, Seoul, Republic of Korea;

关键词: Models for Dark Matter;    Particle Nature of Dark Matter;    Early Universe Particle Physics;   

DOI  :  10.1007/JHEP10(2022)182

 received in 2022-07-29, accepted in 2022-10-17,  发布年份 2022

来源: Springer

【 摘 要 】

In this paper, we construct the first asymmetric strongly interacting massive particles (SIMP) dark matter (DM) model, where a new vector-like fermion and a new complex scalar both having nonzero chemical potentials can be asymmetric DM particles. After the spontaneous breaking of a U(1)D dark gauge symmetry, these two particles can have accidental ℤ4 charges making them stable. By adding one more complex scalar as a mediator between the SIMP DM, the relic density of DM is determined by 3 → 2 and two-loop induced 2 → 2 annihilations in this model. On the other hand, the SIMP DM can maintain kinetic equilibrium with the thermal bath until the DM freeze-out temperature via the new gauge interaction. Interestingly, this model can have a bouncing effect on DM, whereby the DM number density rises after the chemical freeze-out of DM. With this effect, the prediction of the DM self-interacting cross section in this model can be consistent with astrophysical observations, and the ratio of the DM energy density to the baryonic matter energy density can be explained by primordial asymmetries. We also predict the DM-electron elastic scattering cross section that can be used to test this model in future projected experiments.

【 授权许可】

Unknown   
© The Author(s) 2022