511 citations · 4.3k across the 78 of their papers we have counts for
78 papers
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…
Wave focusing by submerged islands and gravitational analogues
Theo Torres, Max Lloyd, Sam R. Dolan +1
We study water waves propagating over a smooth obstacle in a fluid of varying depth, motivated by the observation that submerged islands in the ocean act as effective lenses that i…
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…