64 citations · 175 across the 6 of their papers we have counts for
6 papers
A Solution to the Graceful Exit Problem in Pre-Big Bang Cosmology
G. F. R. Ellis, D. C. Roberts, D. Solomons +1
We examine the string cosmology equations with a dilaton potential in the context of the Pre-Big Bang Scenario with the desired scale factor duality, and give a generic algorithm f…
Lensing and caustic effects on cosmological distances
G. F. R. Ellis, B. A. Bassett, P. K. Dunsby
We consider the changes which occur in cosmological distances due to the combined effects of some null geodesics passing through low-density regions while others pass through lensi…
Irrotational dust with Div H=0
W. M. Lesame, G. F. R. Ellis, P. K. S. Dunsby
For irrotational dust the shear tensor is consistently diagonalizable with its covariant time derivative: , if and only if the divergence of the mag…
Integrability Conditions for Irrotational Dust with a Purely Electric Weyl Tensor: A Tetrad Analysis
W. M. Lesame, P. K. S. Dunsby, G. F. R. Ellis
All spacetimes for an irrotational collisionless fluid with a purely electric Weyl tensor, with spacetime curvature determined by the exact Einstein field equations, are shown to b…
Newtonian Evolution of the Weyl Tensor
G. F. R. Ellis, P. K. S. Dunsby
In an interesting recent paper on the growth of inhomogeneity through the effect of gravity [1], Bertschinger and Hamilton derive equations for the electric and magnetic parts of t…
Shrinking and the True Power Spectrum at Decoupling
B. A. C. C. Bassett, P. K. S. Dunsby, G. F. R. Ellis
In this paper we examine the change in the estimated spatial power spectra at decoupling due to the effects of our clumpy universe which modify observational distances. We find tha…