Left-invariant Pseudo-Riemannian metrics on Lie groups: The null cone II
Left-invariant Pseudo-Riemannian metrics on Lie groups: The null cone II
We continue to study left-invariant pseudo-Riemannian metrics on Lie groups being in the null cone of the $O(p,q)$-action using the moving bracket approach. In particular, the Lie algebra being in the null cone implies that the pseudo-Riemannian metric have all vanishing scalar curvature invariants (VSI). We consider \emph{all} Lie algebras …