45 citations · 135 across the 11 of their papers we have counts for
13 papers
General-relativistic thin-shell Dyson mega-spheres
Thomas Berry, Alex Simpson, Matt Visser
Loosely inspired by the somewhat fanciful notion of detecting an arbitrarily advanced alien civilization, we consider a general-relativistic thin-shell Dyson mega-sphere completely…
Constant- geodesics in the Painleve-Gullstrand form of Lense-Thirring spacetime
Joshua Baines, Thomas Berry, Alex Simpson +1
Herein we explore the non-equatorial constant- ("quasi-circular") geodesics (both timelike and null) in the Painleve-Gullstrand variant of the Lense-Thirring spacetime recently…
Geodesics for the Painleve-Gullstrand form of Lense-Thirring spacetime
Joshua Baines, Thomas Berry, Alex Simpson +1
Recently, the current authors have formulated and extensively explored a rather novel Painleve-Gullstrand variant of the slow-rotation Lense-Thirring spacetime, a variant which has…
Killing tensor and Carter constant for Painleve-Gullstrand form of Lense-Thirring spacetime
Joshua Baines, Thomas Berry, Alex Simpson +1
Recently, the authors have formulated and explored a novel Painleve-Gullstrand variant of the Lense-Thirring spacetime, which has some particularly elegant features -- including un…
Mimicking Black Holes in General Relativity
Thomas Berry
The central theme of this thesis is the study and analysis of black hole mimickers. The concept of a black hole mimicker is introduced, and various mimicker spacetime models are ex…
General class of "quantum deformed" regular black holes
Thomas Berry, Alex Simpson, Matt Visser
We discuss the "quantum deformed Schwarzschild spacetime" as originally introduced by Kazakov and Solodukhin in 1993, and investigate the precise sense in which it does and does no…
Lorentz boosts and Wigner rotations: self-adjoint complexified quaternions
Thomas Berry, Matt Visser
Herein we shall consider Lorentz boosts and Wigner rotations from a (complexified) quaternionic point of view. We shall demonstrate that for a suitably defined self-adjoint complex…
Photon spheres, ISCOs, and OSCOs: Astrophysical observables for regular black holes with asymptotically Minkowski cores
Thomas Berry, Alex Simpson, Matt Visser
Classical black holes contain a singularity at their core. This has prompted various researchers to propose a multitude of modified spacetimes that mimic the physically observable…
Darboux diagonalization of the spatial 3-metric in Kerr spacetime
Joshua Baines, Thomas Berry, Alex Simpson +1
The astrophysical importance of the Kerr spacetime cannot be overstated. Of the currently known exact solutions to the Einstein field equations, the Kerr spacetime stands out in te…
Thin-shell traversable wormhole crafted from a regular black hole with asymptotically Minkowski core
Thomas Berry, Francisco S. N. Lobo, Alex Simpson +1
Recently, a novel model for a regular black hole was advocated which possesses an asymptotically Minkowski core implemented via an exponential suppression (in the core region) of t…
Unit-lapse versions of the Kerr spacetime
Joshua Baines, Thomas Berry, Alex Simpson +1
The Kerr spacetime is perhaps the most astrophysically important of the currently known exact solutions to the Einstein field equations. Whenever spacetimes can be put in unit-laps…
Painleve-Gullstrand form of the Lense-Thirring spacetime
Joshua Baines, Thomas Berry, Alex Simpson +1
The standard Lense-Thirring metric is a century-old slow-rotation large-distance approximation to the gravitational field outside a rotating massive body, depending only on the tot…
Relativistic combination of non-collinear 3-velocities using quaternions
Thomas Berry, Matt Visser
Quaternions have an (over a century-old) extensive and quite complicated interaction with special relativity. Since quaternions are intrinsically 4-dimensional, and do such a good…