On pseudo quasi-Einstein manifolds
A type of non-flat semi-Riemannian manifolds, called pseudo quasi-Einstein manifold, is introduced and studied in detail. The quasi-Einstein manifolds are well-known, and are relevant in general relativity: Robertson-Walker spacetimes belong to this class. Presenting a number of non-trivial examples, the author demonstrates that the more general new class does exist and noteworthy.
scientific article; zbMATH DE number 5881154