关键词: Schwarz lemmas, Bochner formulas, holomorphic map, Hermitian manifolds, $\ell$-second Ricci curvature

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, and some rigidity and degeneracy theorems. For instance, we show that there is no non-constant holomorphic map from a compact 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[5, 6] proved recently by L. Ni on Kähler manifolds to Hermitian manifolds. We also derive an integral inequality for a holomorphic map between Hermitian manifolds.

Key words: Schwarz lemmas, Bochner formulas, holomorphic map, Hermitian manifolds, $\ell$-second Ricci curvature