SMuK 2023 – wissenschaftliches Programm

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GR: Fachverband Gravitation und Relativitätstheorie

GR 9: Gravitational Waves and Astrophysics I

GR 9.2: Vortrag

Mittwoch, 22. März 2023, 16:20–16:40, ZEU/0260

To ring or not to ring, the tale of black hole quasi-normal modes — •Peter James Nee, Sebastian H. Völkel, and Harald Pfeiffer — Max Planck Institute for Gravitational Physics (Albert Einstein Institute), D-14476 Potsdam, Germany

The extraction of quasi-normal modes from compact binary mergers (also referred to as black hole spectroscopy) is one of the most promising pillars in current and future strong gravity tests. Recent works have sought to push current ringdown analysis into the non-linear merger part of the waveform via the inclusion of overtones, to better reproduce the waveform and ascertain the remnant black hole parameters. However it is well-believed that the presence of overtones is a non-trivial question, and as such caution is warranted. In this work we explore the potential pitfalls in both waveform reconstruction and parameter extraction in ringdown analysis. To this extent, we revisit the simpler problem of wave propagation in both Regge-Wheeler and Pöschl-Teller systems. We employ several modelling approaches to waveforms generated via a finite-difference evolution scheme, allowing for a varying number of overtones. The fitting is also performed over differently sized windows of the waveforms.