Jeu. 16/02/2023 14:00 Andromede, Bâtiment 11, Etage 3
EGANA-UGRINOVIC Daniel (Perimeter Institute (Canada))
Candidat CNRS (séminaire en visio)
New astrophysical signatures of ultra-light bosons
(LUPM/Particules, Astroparticules, Cosmologie : Théorie)
Ultra-light bosons such as axions and dark photons are copiously produced around black holes due to the superradiant instability, at the expense of the black hole’s mass and spin. Here I present two new signatures of black-hole superradiance that can be used to look for these particles. First, I show that the superradiant spin-down of super massive black holes is uniquely imprinted in measurements of stellar tidal disruption event (TDE) rates. Upcoming TDE rate measurements by the LSST could reveal or set constraints on the existence of axions or dark photons with masses around 10^-19 eV. And second, I show that kinetically-mixed dark-photon superradiant clouds around stellar mass black holes lead to a new type of electromagnetically bright and possibly pulsating astrophysical source. These “new pulsars”, which are realized for dark photons with masses around 10^-13 eV, can be looked for using X-ray and radio telescopes, and by performing GW searches of anomalous pulsars.
Pour plus d'informations, merci de contacter Brümmer F.