Black hole binaries: Ergoregions, photon surfaces, wave scattering, and quasinormal modes
Black hole binaries: Ergoregions, photon surfaces, wave scattering, and quasinormal modes
Closed photon orbits around isolated black holes are related to important aspects of black hole physics, such as strong lensing, absorption cross section of null particles and the way that black holes relax through quasinormal ringing. When two black holes are present -- such as during the inspiral and merger …