Publications (15)
Environmental effects in extreme mass ratio inspirals: perturbations to the environment in Kerr
Conor Dyson, Thomas F. M. Spieksma, Richard Brito +2
Future gravitational wave observatories open a unique avenue to study the environments surrounding black holes. Intermediate or extreme mass ratio inspirals will spend thousands to…
Waveform Modelling for the Laser Interferometer Space Antenna
LISA Consortium Waveform Working Group, Niayesh Afshordi, Sarp Akçay +144
LISA, the Laser Interferometer Space Antenna, will usher in a new era in gravitational-wave astronomy. As the first anticipated space-based gravitational-wave detector, it will exp…
Waves on a vortex: rays, rings and resonances
Theo Torres, Antonin Coutant, Sam Dolan +1
We study the scattering of surface water waves with irrotational draining vortices. At small depth, this system is a mathematical analogue of a rotating black hole and can be used…
Bound states and decay times of fermions in a Schwarzschild black hole background
Anthony Lasenby, Chris Doran, Jonathan Pritchard +2
We compute the spectrum of normalizable fermion bound states in a Schwarzschild black hole background. The eigenstates have complex energies. The real part of the energies, for sma…
Self-Force and Green Function in Schwarzschild spacetime via Quasinormal Modes and Branch Cut
Marc Casals, Sam Dolan, Adrian C. Ottewill +1
The motion of a small compact object in a curved background spacetime deviates from a geodesic due to the action of its own field, giving rise to a self-force. This self-force may…
Einstein-charged scalar field theory: black hole solutions and their stability
Supakchai Ponglertsakul, Sam Dolan, Elizabeth Winstanley
A complex scalar field on a charged black hole in a cavity is known to experience a superradiant instability. We investigate possible final states of this instability. We find hair…
Absorption of electromagnetic plane waves by rotating black holes
Luiz C. S. Leite, Sam Dolan, LuÃs C. B. Crispino
We study the absorption of monochromatic electromagnetic plane waves impinging upon a Kerr black hole, in the general case that the direction of incidence is not aligned with the b…
Black hole solutions in Einstein-charged scalar field theory
Supakchai Ponglertsakul, Sam Dolan, Elizabeth Winstanley
We investigate possible end-points of the superradiant instability for a charged black hole with a reflecting mirror. By considering a fully coupled system of gravity and a charged…
Fermion absorption cross section of a Schwarzschild black hole
Chris Doran, Anthony Lasenby, Sam Dolan +1
We study the absorption of massive spin-half particles by a small Schwarzschild black hole by numerically solving the single-particle Dirac equation in Painleve-Gullstrand coordina…
Pade Approximants of the Green Function in Spherically Symmetric Spacetimes
Marc Casals, Sam Dolan, Adrian Ottewill +1
We investigate the scalar Green function for spherically symmetric spacetimes expressed as a coordinate series expansion in the separation of the points. We calculate the series ex…
The massive Dirac field on a rotating black hole spacetime: Angular solutions
Sam Dolan, Jonathan Gair
The massive Dirac equation on a Kerr-Newman background may be solved by the method of separation of variables. The radial and angular equations are coupled via an angular eigenvalu…
Fermion scattering by a Schwarzschild black hole
Sam Dolan, Chris Doran, Anthony Lasenby
We study the scattering of massive spin-half waves by a Schwarzschild black hole using analytical and numerical methods. We begin by extending a recent perturbation theory calculat…
Method of Matched Expansions & the Singularity Structure of the Green Function
Marc Casals, Sam Dolan, Adrian C. Ottewill +1
We present the first successful application of the method of Matched Expansions for the calculation of the self-force on a point particle in a curved spacetime. We investigate the…
Spectral lines of extreme compact objects
Caio F. B. Macedo, Tom Stratton, Sam Dolan +1
We study the absorption of scalar fields by extreme/exotic compact objects (ECOs) -- horizonless alternatives to black holes -- via a simple model in which dissipative mechanisms a…
Spin-orbit precession for eccentric black hole binaries at first order in the mass ratio
Sarp Akcay, David Dempsey, Sam Dolan
We consider spin-orbit ("geodetic") precession for a compact binary in strong-field gravity. Specifically, we compute , the ratio of the accumulated spin-precession and orbital…