Abstract
Classification of conformally flat n-dimensional pseudo-Riemannian spaces via Plebanski's method is discussed. It is based on embedding these spaces into a flat (n + 2)-dimensional space and on finding their minimal isometry groups which are subgroups of the conformal group. In particular, the case n = 4 is given in full detail and compared with incomplete results known in the literature. The found conformally flat spacetimes are identified with the associated solutions of the Einstein equations and with the spacetimes used in various cosmological considerations.
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Bačkovský, P., Niederle, J. On classification of conformally flat spaces. Czechoslovak Journal of Physics 47, 1001–1017 (1997). https://doi.org/10.1023/A:1021181106125
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DOI: https://doi.org/10.1023/A:1021181106125