Pantheon SEMPARIS Le serveur des séminaires parisiens Paris

Statut Confirmé
Domaines hep-ph
Date Jeudi 12 Octobre 2017
Heure 16:00
Institut LPT
Salle 114
Nom de l'orateur Bernal
Prenom de l'orateur Nicolas
Addresse email de l'orateur
Institution de l'orateur Antonio Narino University
Titre Z2 SIMP Dark Matter
Résumé 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, a la freeze-in. This scenario is exemplified in the context of the Singlet Scalar dark matter model.
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