Multimode Quasinormal Spectrum from a Perturbed Black Hole
Multimode Quasinormal Spectrum from a Perturbed Black Hole
When two black holes merge, the late stage of gravitational wave emission is a superposition of exponentially damped sinusoids. According to the black hole no-hair theorem, this ringdown spectrum depends only on the mass and angular momentum of the final black hole. An observation of more than one ringdown mode …