Speaker
Description
The mass of a black hole can dynamically evolve due to various physical processes, such as for instance accretion, Hawking radiation, absorption
of gravitational/electromagnetic waves, superradiance, etc. This evolution might have an impact on astrophysical observables like the ringdown gravitational signal. An effective description of a spherically symmetric black hole with evolving mass is provided by the Vaidya metric. In our investigation, we explore the dynamics of linear perturbations on this background, assuming a slow evolution (i.e. expanding at linear order also in the rate of change of the mass). Despite the time-dependent background, our approach allows for treating the perturbations in the frequency domain, and for computing explicitly the quasi-normal modes and the tidal Love number.
