2 problems

Let a spacetime be a constant scalar invariant (CSI) spacetime, meaning that all scalar polynomial curvature invariants are constant. The higher-dimensional Kundt CSI class consist…

Kundt's conjecture. If all curvature tensors of $(M,g)$ are of aligned type II or more special with respect to some null congruence, then $(M,g)$ is degenerate Kundt: for each poin…