2 papers
gr-qc1998
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…
gr-qc1995
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…