On the Lichnerowicz conjecture for CR manifolds with mixed signature

Abstract

We construct examples of nondegenerate CR manifolds with Levi form of signature $(p,q)$, $2\le p\le q$, which are compact, not locally CR flat, and admit essential CR vector fields. We also construct an example of a noncompact nondegenerate CR manifold with signature $(1,n-1)$ which is not locally CR flat and admits an essential CR vector fields. These provide counterexamples to the analogue of the Lichnerowicz conjecture for CR manifolds with mixed signature.

7 pages

References in corpus (1)

• The gap phenomenon in parabolic geometries

Cited by in corpus (1)

• Higher rank parabolic geometries with essential automorphisms and nonvanishing curvature