Commentarii Mathematici Helvetici
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Published online: 2002-06-30
Kodaira dimensions and hyperbolicity of nonpositively curved compact Kähler manifoldsFangyang Zheng (1) Ohio State University, Columbus, USA
In this article, we prove that a compact Kähler manifold M n with real analytic metric and with nonpositive sectional curvature must have its Kodaira dimension, its Ricci rank and the codimension of its Euclidean de Rham factor all equal to each other. In particular, M n is of general type if and only if it is without flat de Rham factor. By using a result of Lu and Yau, we also prove that for a compact Kähler surface M 2 with nonpositive sectional curvature, if M 2 is of general type, then it is Kobayashi hyperbolic.
Keywords: Compact Kähler manifold, nonpositive sectional curvature, Ricci rank, Ricci kernel foliation, Euclidean de Rham factor, Kobayashi hyperbolic, Kähler hyperbolic, visibility axiom
Zheng Fangyang: Kodaira dimensions and hyperbolicity of nonpositively curved compact Kähler manifolds. Comment. Math. Helv. 77 (2002), 221-234. doi: 10.1007/s00014-002-8337-z