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The presence of Killing-Yano tensors implies the existence of nongeneric supercharges in spinning point particle theories on curved backgrounds. Dual metrics are defined through their associated nondegenerate Killing tensors of valence two. Siklos spacetimes, which are the only nontrivial Einstein spaces conformal to nonflat pp-waves are investigated with regard to the existence of their corresponding Killing and Killing-Yano tensors. It is found that a class of Siklos space-times admit dual metrics and nongeneric supercharges. [ABSTRACT FROM AUTHOR]

Second-rank nondegenerate Killing tensors for some subclasses of space-times admitting parallel null one-planes are investigated. Lichéerowicz radiation conditions are imposed to provide a physical meaning to space-times whose metrics are described through their associated second-rank Killing tensors. Conditions under which the dual space-times retain the same physical properties are presented. [ABSTRACT FROM AUTHOR]