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Gravitational waves provide a window to probe general relativity (GR) underextreme conditions. The recent observations of GW190412 and GW190814 are uniquehigh-mass-ratio mergers that enable the observation of gravitational-waveharmonics beyond the dominant $(\ell, m) = (2, 2)$ mode. Using these events, wesearch for physics beyond GR by allowing the source parameters measured fromthe sub-dominant harmonics to deviate from that of the dominant mode. Allresults 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 modewhen 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 ofthe $(3, 3)$ mode to be within $\pm1\%$ of the expected value from GR.

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