Splitting theorem for sheaves of holomorphic $k$-vectors on complex contact manifolds

Abstract

A complex contact structure $\gamma$ is defined by a system of holomorphic local $1$-forms satisfying the completely non-integrability condition. The contact structure induces a subbundle ${\rm Ker}\, \gamma$ of the tangent bundle and a line bundle $L$. In this paper, we prove that the sheaf of holomorphic $k$-vectors on a complex contact manifold splits into the sum of $\mathcal{O}(\bigwedge^{k}{\rm Ker}\, \gamma)$ and $\mathcal{O}(L\otimes \bigwedge^{k-1} {\rm Ker}\, \gamma)$ as sheaves of {\it $\mathbb{C}$-module}. The theorem induces the short exact sequence of cohomology of holomorphic $k$-vectors, and we obtain vanishing theorems for the cohomology of $\mathcal{O}(\bigwedge^{k} \ker \gamma)$.