GraSP23 || GravityShapePisa 2023

Session

Quasi Normal Modes for Kerr Black Holes

25 Oct 2023, 09:30

Aula Magna - Dipartimento di Fisica (Università di Pisa - Dipartimento di Fisica)

Conveners

Quasi Normal Modes for Kerr Black Holes

• Maria Antonietta Palaia (University of Pisa)
• Francesco Tarantelli (University of Pisa)

51. Non-linear Black Hole Ringdowns: an Analytical Approach

Davide Perrone (University of Geneva)

25/10/2023, 09:30

Invited Speaker

Due to the nature of gravity, non-linear effects are left imprinted in the quasi-normal modes generated in the ringdown phase of the merger of two black holes. We offer an analytical treatment of the quasi-normal modes at second-order in black hole perturbation theory which takes advantage from the fact that the non-linear sources are peaked around the light ring. As a byproduct, we describe...

39. Black hole spectroscopy beyond Kerr

Andrea Maselli (Istituto Nazionale di Fisica Nucleare)

25/10/2023, 10:00

Invited Speaker

Black-hole spectroscopy is one of the most promising tools to test gravity in extreme regimes and to probe the nature of black holes. However, tests based on ringdown observations are currently limited by the lack of parametrization that are both robust and accurate, able to capture generic modifications of the Kerr spectrum. In this talk I will present a new observable-based parametrization...

46. Explaining nonlinearities in black hole ringdowns from symmetries

Prof. Antonio Riotto (University of Geneva)

Invited Speaker

It has been recently pointed out that nonlinear effects are necessary to model the ringdown stage of the gravitational waveform produced by the merger of two black holes giving rise to a remnant Kerr black hole. We show that this nonlinear behavior is explained, both on the qualitative and quantitative level, by near-horizon symmetries of the Kerr black hole within the Kerr/CFT correspondence.