Black hole ringing in General Relativity and beyond

The black hole ringdown offers a powerful window into both astro- and fundamental physics. However, the construction of an accurate and reliable theoretical template for the interpretation of real data is crucial. In this seminar, I will discuss how ringdown modes respond to some ditinct physical key-effects.

First, I will talk about the impact of a dynamical evolution of the black hole mass due to accretion or radiation. Then, I will present a parametrized framework to describe possible deviations from General Relativity in the ringdown spectrum of spinning black holes. Finally, I will explore how incomplete ringdown modeling can bias parameter estimation for massive black hole binaries observed by LISA, and assess the optimal degree of accuracy of the template that is required across parameter space.