Discrete isotropies in a class of cosmological models
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- Schmidt, B.G. Commun.Math. Phys. (1969) 15: 329. doi:10.1007/BF01645531
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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.