Binary black hole spectroscopy: a no-hair test of GW190814 and GW190412

Abstract

Gravitational waves provide a window to probe general relativity (GR) under extreme conditions. The recent observations of GW190412 and GW190814 are unique high-mass-ratio mergers that enable the observation of gravitational-wave harmonics beyond the dominant $(\ell ,m)=(2,2)$ mode. Using these events, we search for physics beyond GR by allowing the source parameters measured from the sub-dominant harmonics to deviate from that of the dominant mode. All results are consistent with GR. We constrain the chirp mass as measured by the $(\ell ,m)=(3,3)$ mode to be within $0_{-3}^{+5}\%$ of the dominant mode when we allow both the masses and spins of the sub-dominant modes to deviate. If we allow only the mass parameters to deviate, we constrain the chirp mass of the $(3,3)$ mode to be within $\pm 1\%$ of the expected value from GR.

8 pages, 4 figures; supplemental material at: https://github.com/gwastro/binary-black-hole-spectroscopy

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• Rotational mass of anisotropic neutron stars within Rastall gravity
• Phase consistency test to identify type II strongly lensed gravitational wave signals using a single event
• Modeling the BMS transformation induced by a binary black hole merger
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• On the ease of excitation of black hole ringing: Quantifying the importance of overtones by the excitation factors