Abstract
It is shown that if in some local coordinate system the componentsR i jkl of the curvature tensor of an empty space-time are known, then, provided the space-time is not of Petrov typeN with hypersurface orthogonal geodesic rays, the components of the metric tensor are uniquely determined up to a trivial constant scaling factor. The Petrov type-N empty space-times with hypersurface orthogonal geodesic rays are investigated. The most general mappings leaving the curvature tensorR i jkl invariant are found for each class of these space-times.
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Collinson, C.D., da Graça Lopes Rodrigues Vaz, E. Mappings of empty space-times leaving the curvature tensor invariant. Gen Relat Gravit 14, 5–15 (1982). https://doi.org/10.1007/BF00756191
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DOI: https://doi.org/10.1007/BF00756191