Pantheon SEMPARIS Le serveur des séminaires parisiens Paris

Statut Confirmé
Série IPHT-HEP
Domaines hep-ph
Date Lundi 30 Mai 2016
Heure 14:30
Institut IPHT
Salle Pièce 50, Bât. 774
Nom de l'orateur Andrew Spray
Prenom de l'orateur
Addresse email de l'orateur
Institution de l'orateur IBS Center for Theoretical Physics of the Universe
Titre Semi-Annihilating Dark Matter
Résumé Semi-annihilation is a generic feature of dark matter, when it is stabilised by a symmetry larger than a Z2. It results in a greater range of indirect detection signals, expands the parameter space that produces the observed relic density, and is frequently associated with multi-component dark sectors. We discuss several recent models that demonstrate the potential implications. First are two Higgs-portal models where semi-annihilation is essential to explaining the gamma ray excess observed by the Fermi telescope. Specifically, it allows us to avoid stringent direct detection constraints and, by changing the photon spectrum, also improves the quality of the fit. Next we consider the first example of a model with both semi-annihilation and the Sommerfeld enhancement. The interplay of these two features leads to a variety of signals; we discuss both current limits and future discovery prospects. Finally, we discuss some ongoing efforts to perform a systematic study of semi-annihilating models and the constraints that apply to them.
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