Pantheon SEMPARIS Le serveur des séminaires parisiens Paris

Statut Confirmé
Domaines hep-ph
Date Mardi 21 Mars 2023
Heure 14:00
Institut IPHT
Salle Salle Claude Itzykson, Bât. 774
Nom de l'orateur Marco Gorghetto
Prenom de l'orateur
Addresse email de l'orateur
Institution de l'orateur Weizmann Institute of Science
Titre Boson Stars and Dark Matter Substructure
Résumé I will argue that many theories in which the dark matter is a light boson (with a mass < eV) lead to theoretically and observationally interesting dark matter small-scale structure. As a particular, directly calculable, example I will show that this is the case for any new vector boson with non-zero mass (a ‘dark photon’ or ‘Proca boson’) that is present during inflation, at which time a relic abundance is automatically produced purely from vacuum fluctuations. Due to a remarkable parametric coincidence between the size of the primordial density perturbations and the scale at which quantum pressure is relevant, a substantial fraction of the dark matter inevitably collapses into gravitationally bound solitons. The central densities of these ‘dark photon star’, or ‘Proca star’, solitons are typically a factor 10^6 larger than the local background dark matter density today. I will also mention some possible observational consequences and directions for future work.
Numéro de preprint arXiv
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