Search

Talk

Non-linearities in the black-hole ringdown

  • Patrick Bourg (Radboud)
ITP - Seminarraum Universität Leipzig, ITP (Leipzig)

Abstract

After the merger of two black holes (BHs), the distorted remnant BH rings down towards a stationary state through its emission of gravitational waves (GWs). The signal associated with this process is well modelled by a superposition of exponentially damped sinusoids, with complex frequencies given by the so-called quasi-normal modes (QNMs), which are uniquely determined by the mass and spin of the final BH. With a view on future gravitational-wave detectors, the BH spectroscopy program aims at extracting multiple QNMs from ringdown signals in order to perform stringent tests of General Relativity, probe the BH geometry, and constrain features of the surrounding environment. While the linear QNM regime has been extensively studied, recent work has highlighted the importance of second-perturbative-order. In this talk, will explain the importance of second-order effects to the QNM ringdown through recent results and show they relate to the linear regime quantitively.no abstract available

seminar
09.12.22 06.02.25

General Relativity

Universität Leipzig, ITP ITP - Seminarraum