Perturbations of the Vaidya metric in the frequency domain: Quasi-normal modes and tidal response

Understand

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 can 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 constant rate of change for the mass.