Pseudo-Riemannian VSI spaces
Pseudo-Riemannian VSI spaces
In this paper we consider pseudo-Riemannian spaces of arbitrary signature for which all of the polynomial curvature invariants vanish (VSI spaces). We discuss an algebraic classification of pseudo-Riemannian spaces in terms of the boost weight decomposition and define the Si- and N-properties, and show that if the curvature tensors of …