Papers › Binary black hole spectroscopy: a no-hair test of GW190814 and GW190412
Binary black hole spectroscopy: a no-hair test of GW190814 and GW190412
Collin D. Capano, Alexander H. Nitz
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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 (ℓ, 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 (ℓ, 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 ±1% of the expected value from GR.
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