The $\partial \overline{\partial }$-Bochner formulas for holomorphic mappings between Hermitian manifolds and their applications

Abstract

In this paper, we derive some $\partial \overline{\partial }$-Bochner formulas for holomorphic maps between Hermitian manifolds. As applications, we prove some Schwarz lemma type estimates, rigidity and degeneracy theorems. For instance, we show that there is no non-constant holomorphic map from a comapct Hermitian manifold with positive (resp. non-negative) $\ell$-second Ricci curvature to a Hermitian manifold with non-positive (resp. negative) real bisectional curvature. These theorems generalize the results \cite{Ni1,Ni2} proved recently by L. Ni on Kähler manifolds to Hermitian manifolds. We also derive an integral inequality for holomorphic map between Hermitian manifolds.