Speaker: Matteo Della Rocca (Sapienza University of Rome)
Title: Gravitational atom spectroscopy
Abstract: Massive scalar fields can form bound clouds around black holes. Independently of the initial data, after an initial transient, these scalar clouds are well described by gravitational atoms, where the scalar field settles into a superposition of quasi-bound states. In a quasi-bound state, the scalar field oscillates with a proper complex frequency, decays in time, has an ingoing wave behaviour at the horizon and exponentially decays at spatial infinity. Previous results suggest that scalar clouds can be detectable during the inspiral-merger-ringdown. We quantify the effect of these scalar clouds on the ringdown by computing the shift of the fundamental quasi-normal mode in the axial sector. We found that for compact enough configuration, these shifts are in principle detectable even with current detectors.
Room: Sala de Reuniões e Seminários (2-8.3, 2nd Floor of Physics Building)