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Dynamical system approach to the spectral (in)stability of black holes under localised potential perturbations
T. Torres, S. R. Dolan
The aim of this work is to improve understanding of the resonant spectra of black holes under perturbations arising from e.g. compact objects or accretion disks in their vicinity.…
Absorption and (unbounded) superradiance in a static regular black hole spacetime
Marco A. A. de Paula, Luiz C. S. Leite, Sam R. Dolan +1
Regular black holes (RBHs) -- geometries free from curvature singularities -- arise naturally in theories of non linear electrodynamics. Here we study the absorption, and superradi…
Superradiant instability of a charged regular black hole
Sam R. Dolan, Marco A. A. de Paula, Luiz C. S. Leite +1
We show that a charged, massive scalar field in the vicinity of an electrically-charged Ayón-Beato-García (ABG) regular black hole has a spectrum of quasibound states that (in a ce…
Metric perturbations of Kerr spacetime in Lorenz gauge: Circular equatorial orbits
Sam R Dolan, Leanne Durkan, Chris Kavanagh +1
We construct the metric perturbation in Lorenz gauge for a compact body on a circular equatorial orbit of a rotating black hole (Kerr) spacetime, using a newly-developed method of…
Gravitational perturbations of rotating black holes in Lorenz gauge
Sam R. Dolan, Chris Kavanagh, Barry Wardell
Perturbations of Kerr spacetime are typically studied with the Teukolsky formalism, in which a pair of invariant components of the perturbed Weyl tensor are expressed in terms of s…
Conversion of electromagnetic and gravitational waves by a charged black hole
Mohamed Ould El Hadj, Sam R. Dolan
In a strong electromagnetic field, gravitational waves are converted into electromagnetic waves of the same frequency, and vice versa. Here we calculate the scattering and conversi…