We reduce the study of perturbations of rotating black holes in higher-derivative extensions
of general relativity to a system of decoupled radial equations that stem from a set of …

Given the recent development of rotating black-bounce-Kerr spacetimes, for both theoretical
and observational purposes it becomes interesting to see whether it might be possible to …

These lecture notes are intended for starting PhD students in theoretical physics who have a
working knowledge of General Relativity. The four topics covered are: Surface charges as …

We compute the quasi-bound state spectra of ultralight scalar and vector fields around
rotating black holes. These spectra are determined by the gravitational fine structure …

We study the double-copy relation between classical solutions in gauge theory and gravity,
focusing on four-dimensional vacuum metrics of algebraic type D, a class that includes …

We compute the spectrum of linearized gravitational excitations of black holes with
substantial angular momentum in the presence of higher-derivative corrections to general …

We analyse in some detail a highly tractable non-singular modification of the Kerr geometry,
dubbed the" eye of the storm"—a rotating regular black hole with an asymptotically …

A bstract The double copy formalism provides an intriguing connection between gauge
theories and gravity. It was first demonstrated in the perturbative context of scattering …

We study the properties of chiral anomalies in a wide class of spacetimes that possess a
principal Killing-Yano tensor. This class includes metrics of charged rotating black holes as …

We demonstrate the separability of the massive vector (Proca) field equation in general Kerr-
NUT-AdS black-hole spacetimes in any number of dimensions, filling a long-standing gap in …