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Gravitational wave signatures of black hole quasinormal mode instability

Gravitational wave signatures of black hole quasinormal mode instability
Gravitational wave signatures of black hole quasinormal mode instability
Black hole (BH) spectroscopy has emerged as a powerful approach to extracting spacetime information from gravitational wave (GW) observed signals. Yet, quasinormal mode (QNM) spectral instability under small scale perturbations has been recently shown to be a common classical general relativistic phenomenon [J. L. Jaramillo et al., Phys. Rev. X 11, 031003 (2021)]. This requires assessing its impact on the BH QNM spectrum, in particular on BH QNM overtone frequencies. We conclude (i) perturbed BH QNM overtones are indeed potentially observable in the GW waveform, providing information on small-scale environment BH physics, and (ii) their detection poses a challenging data analysis problem of singular interest for LISA astrophysics. We adopt a twofold approach, combining theoretical results from scattering theory with a fine-tuned data analysis on a highly accurate numerical GW ringdown signal. The former introduces a set of effective parameters (partially relying on a BH Weyl law) to characterize QNM instability physics. The latter provides a proof of principle demonstrating that the QNM spectral instability is indeed accessible in the time-domain GW waveform, though certainly requiring large signal-to-noise ratios. Particular attention is devoted to discussing the patterns of isospectrality loss under QNM instability, since the disentanglement between axial and polar GW parities may already occur within the near-future detection range.
1079-7114
Jaramillo, Jose Luis
1ce0ca50-afbe-4ade-bf78-79c7687d3dcc
Panosso Macedo, Rodrigo
8f176eb4-ca20-492b-a41e-e78d47d6fefe
Al Sheikh, Lamis
d87a98de-88dd-4e22-b1aa-38ef0533e900
Jaramillo, Jose Luis
1ce0ca50-afbe-4ade-bf78-79c7687d3dcc
Panosso Macedo, Rodrigo
8f176eb4-ca20-492b-a41e-e78d47d6fefe
Al Sheikh, Lamis
d87a98de-88dd-4e22-b1aa-38ef0533e900

Jaramillo, Jose Luis, Panosso Macedo, Rodrigo and Al Sheikh, Lamis (2022) Gravitational wave signatures of black hole quasinormal mode instability. Physical Review Letters, 128 (211102). (doi:10.1103/PhysRevLett.128.211102).

Record type: Article

Abstract

Black hole (BH) spectroscopy has emerged as a powerful approach to extracting spacetime information from gravitational wave (GW) observed signals. Yet, quasinormal mode (QNM) spectral instability under small scale perturbations has been recently shown to be a common classical general relativistic phenomenon [J. L. Jaramillo et al., Phys. Rev. X 11, 031003 (2021)]. This requires assessing its impact on the BH QNM spectrum, in particular on BH QNM overtone frequencies. We conclude (i) perturbed BH QNM overtones are indeed potentially observable in the GW waveform, providing information on small-scale environment BH physics, and (ii) their detection poses a challenging data analysis problem of singular interest for LISA astrophysics. We adopt a twofold approach, combining theoretical results from scattering theory with a fine-tuned data analysis on a highly accurate numerical GW ringdown signal. The former introduces a set of effective parameters (partially relying on a BH Weyl law) to characterize QNM instability physics. The latter provides a proof of principle demonstrating that the QNM spectral instability is indeed accessible in the time-domain GW waveform, though certainly requiring large signal-to-noise ratios. Particular attention is devoted to discussing the patterns of isospectrality loss under QNM instability, since the disentanglement between axial and polar GW parities may already occur within the near-future detection range.

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Accepted/In Press date: 7 May 2021
Published date: 26 May 2022

Identifiers

Local EPrints ID: 457942
URI: http://eprints.soton.ac.uk/id/eprint/457942
ISSN: 1079-7114
PURE UUID: 739feb66-22da-4a44-a8bb-66876610bbc5
ORCID for Rodrigo Panosso Macedo: ORCID iD orcid.org/0000-0003-2942-5080

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Date deposited: 23 Jun 2022 16:55
Last modified: 29 Jun 2022 02:07

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Contributors

Author: Jose Luis Jaramillo
Author: Lamis Al Sheikh

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