ℤ2 SIMP dark matter

Nicolás Bernal,Xiaoyong Chu

doi:10.1088/1475-7516/2016/01/006

Abstract

Dark matter with strong self-interactions provides a compelling solution to several small-scale structure puzzles. Under the assumption that the coupling between dark matter and the Standard Model particles is suppressed, such strongly interacting massive particles (SIMPs) allow for a successful thermal freeze-out through N-to-N′ processes, where N dark matter particles annihilate to N′ of them. In the most common scenarios, where dark matter stability is guaranteed by a ℤ2 symmetry, the seemingly leading annihilating channel, i.e. 3-to-2 process, is forbidden, so the 4-to-2 one dominate the production of the dark matter relic density. Moreover, cosmological observations require that the dark matter sector is colder than the thermal bath of Standard Model particles, a condition that can be dynamically generated via a small portal between dark matter and Standard Model particles, à la freeze-in. This scenario is exemplified in the context of the Singlet Scalar dark matter model.

Highlights

In the most common scenarios, where dark matter stability is guaranteed by a Z2 symmetry, the seemingly leading annihilating channel, i.e. 3to-2 process, is forbidden, so the 4-to-2 one dominate the production of the dark matter relic density
There has been a large amount of research on the singlet scalar dark matter (DM) model, most of them focused on the WIMP scenario, where the singlet S mixes relatively strongly with the Higgs and undergoes a thermal freeze-out
The collisionless cold dark matter (DM) paradigm has been highly successful in accounting for large scale structure of the Universe

Summary

SIMP dark matter

View the article online for updates and enhancements. - Production regimes for Self-Interacting Dark Matter Nicolás Bernal, Xiaoyong Chu, Camilo Garcia-Cely et al. View the article online for updates and enhancements. - Production regimes for Self-Interacting Dark Matter Nicolás Bernal, Xiaoyong Chu, Camilo Garcia-Cely et al. - WIMP and SIMP dark matter from the spontaneous breaking of a global group Nicolás Bernal, Camilo Garcia-Cely and Rogério Rosenfeld. - Fermi Bubbles under Dark Matter Scrutiny Part II: Particle Physics Analysis Wei-Chih Huang, Alfredo Urbano and Wei Xue. - Velocity Dependence from Resonant SelfInteracting Dark Matter Xiaoyong Chu et al. - Phenomenology of self-interacting dark matter in a matter-dominated universe Nicolás Bernal et al. This content was downloaded from IP address 186.217.236.55 on 19/06/2019 at 17:00

Singlet scalar Z2 dark matter

Dark matter self-interactions

A caveat leading to lighter dark matter

Conclusions

A Freeze-out approximation