1 research outputs found
Absorption of electromagnetic and gravitational waves by Kerr black holes
We calculate the absorption cross section for planar waves incident upon Kerr black holes, and present
a unified picture for scalar, electromagnetic and gravitational waves. We highlight the spin-helicity effect
that arises from a coupling between the rotation of the black hole and the helicity of a circularlypolarized
wave. For the case of on-axis incidence, we introduce an extended âsinc approximationâ to
quantify the spin-helicity effect in the strong-field regime