Perturbed Kerr Black Holes can probe deviations from General Relativity
Enrico Barausse, Thomas P. Sotiriou
TL;DR
P perturbed Kerr black holes can probe deviations from General Relativity as well as other gravity theories.
Abstract
Although the Kerr solution is common to many gravity theories, its perturbations are different in different theories. Hence, perturbed Kerr black holes can probe deviations from General Relativity.