New examples of 2-nondegenerate real hypersurfaces in C N $\mathbb {C}^N$ with arbitrary nilpotent symbols

Abstract

We introduce a class of uniformly 2-nondegenerate CR hypersurfaces in $C^N$, for $N>3$, having a rank 1 Levi kernel. The class is first of all remarkable by the fact that for every $N>3$ it forms an explicit infinite-dimensional family of everywhere 2-nondegenerate hypersurfaces. To the best of our knowledge, this is the first such construction. Besides, the class contains infinite-dimensional families of nonequivalent structures having a given constant nilpotent CR symbol for every such symbol. Using methods that are able to handle all cases with $N>5$ simultaneously, we solve the equivalence problem for the considered structures whose symbol is represented by a single Jordan block, classify their algebras of infinitesimal symmetries, and classify the locally homogeneous structures among them. We show that the remaining considered structures, which have symbols represented by a direct sum of Jordan blocks, can be constructed from the single block structures through simple linking and extension processes.