Sobolev estimates for the complex Green operator on CR submanifolds of hypersurface type

Abstract

Let $M$ be a pseudoconvex, oriented, bounded and closed CR submanifold of ${\mathbb{C}}^n$ of hypersurface type. Our main result says that when a certain $1$-form on $M$ is exact on the null space of the Levi form, then the complex Green operator on $M$ satisfies Sobolev estimates. This happens in particular when $M$ admits a set of plurisubharmonic defining functions or when $M$ is strictly pseudoconvex except for the points on a simply connected complex submanifold.