Differential invariants of Kundt spacetimes
arXiv:2103.03693 · doi:10.1088/1361-6382/abff9c
Abstract
We find generators for the algebra of rational differential invariants for general and degenerate Kundt spacetimes and relate this to other approaches to the equivalence problem for Lorentzian metrics. Special attention is given to dimensions three and four.
24 pages