Actions of semisimple Lie groups preserving a degenerate Riemannian metric
classification
🧮 math.DG
math.DS
keywords
degeneratemetricriemannianspaceactionactionsendowedessentially
read the original abstract
We prove a rigidity of the lightcone in Minkowski space. It is essentially the unique space endowed with a degenerate Riemannian metric, of lightlike type, and supporting an isometric non-proper action of a semi-simple group.
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