Merging black holes do not violate the no-hair theorem
the verdict
SUPPORTED
the evidence backs this
confidence 84/100
Observations of gravitational-wave ringdowns from merging black holes consistently support the validity of the no-hair theorem in general relativity.
Evidence for · 2
Testing the No-Hair Theorem with GW150914.
2019 · cited by 24
Gravitational-wave observations of binary black-hole mergers, such as GW150914, show that the properties of the remnant black hole align with the predictions of a Kerr black hole under the no-hair theorem.
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More for · 1
Detection of a Higher Harmonic Quasi-normal Mode in the Ringdown Signal of GW231123
2025 · cited by 0
Analyses of multi-mode ringdown signals from black hole mergers like GW231123 yield inferred remnant properties that are consistent with the no-hair theorem in general relativity.