Abstract
This paper discusses the application of geometric optics to the study of observational properties of cosmological models examined in a previous paper. A number of results concerning these properties are derived, the most interesting of which is the invariance of observational relations under certain discrete isotropy groups. Closed form expressions are obtained in certain cases.
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MacCallum, M.A.H., Ellis, G.F.R. A class of homogeneous cosmological models. Commun.Math. Phys. 19, 31–64 (1970). https://doi.org/10.1007/BF01645496
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DOI: https://doi.org/10.1007/BF01645496