Answers are grounded in this paper and cite their sources.
In a recent paper [M. L. Bedran and B. Lesche, J. Math. Phys. 27, 2360 (1986)], an attempt was made to find an affine collineation in Robertson–Walker space-time. However, only a homothetic affine collineation was found, in the case of a linear scale factor, R(t)∼t. It is pointed out that another homothetic affine collineation exists when R(t)∼tb, and a proper (nonhomothetic) affine collineation in the Einstein static space-times has been found.
No takes yet. Share an insight, caveat, or question.
Roy Maartens (1987) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: