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