On the Lichnerowicz conjecture for CR manifolds with mixed signature

31 Jan 2018 · Case Jeffrey S., Curry Sean N., Matveev Vladimir S. ·

We construct examples of nondegenerate CR manifolds with Levi form of signature $(p,q)$, $2\leq p\leq q$, 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.

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On the Lichnerowicz conjecture for CR manifolds with mixed signature

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