
doi: 10.1063/1.525366
The equation xμνRμ λαβ+xμλRμ ναβ = 0, where xμν and Rμ ναβ are the components of an arbitrary symmetric tensor and of the Riemann tensor formed from the metric tensor gμν, is trivially satisfied by xμν = φgμν. Nontrivial solutions are important in various areas of general relativity such as in the study of curvature collineations, and also in the study of algebraic methods given by Hlavatý and Ihrig for the determination of gμν, from a given set of Rμ ναβ. We have found all Rμ ναβ for which there exist nontrivial solutions of the above equation, and we have given the form of the xμν in each case. Various examples of space–times for explicit nontrivial solutions are discussed.
Local differential geometry of Lorentz metrics, indefinite metrics, curvature collineations, Riemann tensor, spacetimes
Local differential geometry of Lorentz metrics, indefinite metrics, curvature collineations, Riemann tensor, spacetimes
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