Affiliation: SISSA, Italy

Title: Black hole Ringing in General Relativity and Beyond

Abstract: The post-merger gravitational wave signal can be predicted using perturbation theory, and is typically modeled as an infinite sum of quasinormal modes. However, the quasinormal mode spectrum of black holes can be affected by various physical effects, both within General Relativity and beyond. Incorporating these effects into the existing perturbation theory framework presents both a challenge and an opportunity to test new aspects of gravity against data.