Bae YB, Hyun YH, Kang G. Ringdown Gravitational Waves from Close Scattering of Two Black Holes.
PHYSICAL REVIEW LETTERS 2024;
132:261401. [PMID:
38996312 DOI:
10.1103/physrevlett.132.261401]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/28/2023] [Revised: 01/31/2024] [Accepted: 05/14/2024] [Indexed: 07/14/2024]
Abstract
We have numerically investigated close scattering processes of two black holes (BHs). Our careful analysis shows for the first time a nonmerging ringdown gravitational wave induced by dynamical tidal deformations of individual BHs during their close encounter. The ringdown wave frequencies turn out to agree well with the quasinormal ones of a single BH in perturbation theory, despite its distinctive physical context from the merging case. Our study shows a new type of gravitational waveform and opens up a new exploration of strong gravitational interactions using BH encounters.
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