Reduction of five-dimensional uniformly Levi degenerate CR structures to absolute parallelisms

Abstract

Let ${\mathfrak{C}}_{2,1}$ be the class of connected 5-dimensional CR-hypersurfaces that are 2-nondegenerate and uniformly Levi degenerate of rank 1. We show that the CR-structures in ${\mathfrak{C}}_{2,1}$ are reducible to $\mathfrak{so}(3,2)$-valued absolute parallelisms and give applications of this result.