378 citations · 1.4k across the 24 of their papers we have counts for
7 papers · 1 filter
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…
Novel black-bounce spacetimes: wormholes, regularity, energy conditions, and causal structure
Francisco S. N. Lobo, Manuel E. Rodrigues, Marcos V. de S. Silva +2
We develop a number of novel "black-bounce" spacetimes. These are specific regular black holes where the "area radius" always remains non-zero, thereby leading to a "throat" that i…
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…