Z(2) SIMP dark matter

• Autor(a) principal: Bernal, Nicolas [UNESP]
• Data de Publicação: 2016
• Outros Autores: Chu, Xiaoyong
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://dx.doi.org/10.1088/1475-7516/2016/01/006; http://hdl.handle.net/11449/161194
• topic: dark matter theory; particle physics - cosmology connection

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 Z(2) 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, a la freeze-in. This scenario is exempli fied in the context of the Singlet Scalar dark matter model.