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Observation of a multimode quasi-normal spectrum from a perturbed black hole

Capano, C., Cabero, M., Abedi, J., Kastha, S., Westerweck, J., Nitz, A. H., et al. (in preparation). Observation of a multimode quasi-normal spectrum from a perturbed black hole.

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Creators:
Capano, Collin1, Author
Cabero, Miriam, Author
Abedi, Jahed1, Author
Kastha, Shilpa1, Author
Westerweck, Julian1, Author
Nitz, Alexander H.1, Author
Nielsen, Alex B., Author
Affiliations:
1Observational Relativity and Cosmology, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society, ou_24011

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Free keywords: General Relativity and Quantum Cosmology, gr-qc, Astrophysics, High Energy Astrophysical Phenomena, astro-ph.HE
Abstract: We provide strong observational evidence for a multimode black hole ringdown spectrum, using the gravitational wave event GW190521. We show strong evidence for the presence of at least two ringdown modes, with a Bayes factor of $43.4^{+8.1}_{-6.8}$ preferring two modes over one. The dominant mode is the fundamental $\ell=m=2$ harmonic, and the sub-dominant mode corresponds to the fundamental $\ell=m=3$ harmonic. We estimate the redshifted mass and dimensionless spin of the final black hole as $332^{+31}_{-35}\,M_\odot$ and $0.871^{+0.052}_{-0.096}$ respectively. The detection of the two modes disfavors a binary progenitor with equal masses, and the mass ratio is constrained to $0.45^{+0.22}_{-0.29}$. General relativity predicts that the frequency and damping time of each mode in the spectrum depends only on two parameters, the black hole mass and angular momentum. Consistency between the different modes thus provides a test of general relativity. As a test of the black hole no-hair theorem, we constrain the fractional deviation of the sub-dominant mode frequency from the Kerr prediction to $\delta f_{330} = -0.010^{+0.073}_{-0.121}$

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Dates: 2021-05-11
Publication Status: Not specified
Pages: 11 pages, 4 main figures
Publishing info: -
Rev. Type: -
Identifiers: arXiv: 2105.05238
Degree: -

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