827 citations · 16k across the 208 of their papers we have counts for
9 papers · 1 filter
Godel brane
John D. Barrow, Christos G. Tsagas
We consider the brane-world generalisation of the Godel universe and analyse its dynamical interaction with the bulk. The exact homogeneity of the standard Godel spacetime no longe…
Dynamics and stability of the Godel universe
John D. Barrow, Christos G. Tsagas
We use covariant techniques to describe the properties of the Godel universe and then consider its linear response to a variety of perturbations. Against matter aggregations, we fi…
Mapping the Dark Energy with Varying Alpha
David Parkinson, Bruce A. Bassett, John D. Barrow
Cosmological dark energy is a natural source of variation of the fine structure constant. Using a model-independent approach we show that once general assumptions about the alpha-v…
Quasi-Spherical Gravitational Collapse in Any Dimension
Ujjal Debnath, Subenoy Chakraborty, John D. Barrow
We study the occurrence and nature of naked singularities for a dust model with non-zero cosmological constant in ()-dimensional Szekeres space-times (which possess no Killing…
The Future of Tilted Bianchi Universes
John D. Barrow, Sigbjorn Hervik
An asymptotic stability analysis of spatially homogeneous models of Bianchi type containing tilted perfect fluids is performed. Using the known attractors for the non-tilted Bianch…
The Copernican Principle in Compact Spacetimes
John D. Barrow, Janna Levin
Copernicus realised we were not at the centre of the universe. A universe made finite by topological identifications introduces a new Copernican consideration: while we may not be…
A Test of a Test for Chaos
John D. Barrow, Janna Levin
A simple new binary test for chaos has been proposed by Gottwald and Melbourne. We apply this test successfully to the Henon-Heiles and Lorenz systems, demonstrating its applicabil…
Indefinite Information Processing in Ever-expanding Universes
John D. Barrow, Sigbjorn Hervik
We show that generic anisotropic universes arbitrarily close to the open Friedmann universe allow information processing to continue into the infinite future if there is no cosmolo…
On the Stability of the Einstein Static Universe
John D Barrow, George Ellis, Roy Maartens +1
We show using covariant techniques that the Einstein static universe containing a perfect fluid is always neutrally stable against small inhomogeneous vector and tensor perturbatio…