Quadratic quasi-normal mode dependence on linear mode parity
Abstract
Quasinormal modes (QNMs) uniquely describe the dominant piece of the gravitational-wave ringdown of postmerger black holes. While the linear QNM regime has been extensively studied, recent work has highlighted the importance of second-perturbative-order, quadratic QNMs (QQNMs) arising from the nonlinear coupling of linear QNMs. Previous attempts to quantify the magnitude of these QQNMs have shown discrepant results. Using a new hyperboloidal framework, we resolve the discrepancy by showing that the QQNM/QNM ratio is a function not only of the black hole parameters but also of the ratio between even- and odd-parity linear QNMs: the ratio QQNM/QNM depends on what created the ringing black hole, but only through this ratio of even- to odd-parity linear perturbations.
Cite
@article{arxiv.2405.10270,
title = {Quadratic quasi-normal mode dependence on linear mode parity},
author = {Patrick Bourg and Rodrigo Panosso Macedo and Andrew Spiers and Benjamin Leather and Béatrice Bonga and Adam Pound},
journal= {arXiv preprint arXiv:2405.10270},
year = {2025}
}
Comments
9 pages, 1 figure. Accepted for publication in PRL