Abstract
It is shown that a certain class of cosmological models admits discrete isotropies. These models are solutions of Einsteins field equations, characterised by: (1) the matter is described as a perfect fluid, and (2) there exists a group of motions simply transitive on three-surfaces orthogonal to the fluid flow vector.
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Schmidt, B.G. Discrete isotropies in a class of cosmological models. Commun.Math. Phys. 15, 329–336 (1969). https://doi.org/10.1007/BF01645531
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DOI: https://doi.org/10.1007/BF01645531