21 citations · 38 across the 9 of their papers we have counts for
6 papers · 1 filter
Closest Safe Approach to an Accreting Black Hole
Benjamin K. Tippett, Ivan Booth
We examine the causal and geometric horizons of dynamical black holes in Lemaitre-Tolman-Bondi collapsing dust spacetimes. Marginally trapped tubes in these spacetimes may be space…
Traversable Achronal Retrograde Domains In Spacetime
Benjamin K. Tippett, David Tsang
There are many spacetime geometries in general relativity which contain closed timelike curves. A layperson might say that retrograde time travel is possible in such spacetimes. To…
Gravitational Lensing as a Mechanism For Effective Cloaking
Benjamin K. Tippett
In light of the surge in popularity of electromagnetic cloaking devices, we consider whether it is possible to use gravitational lensing to cloak a volume of spacetime. A metric fo…
Gravitational collapse of quantum matter
Benjamin K. Tippett, Viqar Husain
We describe a class of exactly soluble models for gravitational collapse in spherical symmetry obtained by patching dynamical spherically symmetric exterior spacetimes with cosmolo…
Prolate horizons and the Penrose inequality
Benjamin K. Tippett
The Penrose inequality has so far been proven in cases of spherical symmetry and in cases of zero extrinsic curvature. The next simplest case worth exploring would be non-spherical…
Energy conditions and a bounce in FLRW cosmologies
Benjamin K. Tippett, Kayll Lake
Exploiting the existence of two "cosmological" constants, one associated with the classical Lovelock theorem and one with the vacuum energy density, we argue, in a model independen…