Partially hyperbolic compact complex manifolds
Hisashi Kasuya
Nagoya University, Nagoya, JapanDan Popovici
Université de Toulouse, Toulouse, France

Abstract
We propose and investigate two types, the latter with two variants, of notions of partial hyperbolicity accounting for several classes of compact complex manifolds behaving hyperbolically in certain directions, defined by a vector subbundle of the holomorphic tangent bundle, but not necessarily in the other directions. A key role is played by certain entire holomorphic maps, possibly from a higher-dimensional space, into the given manifold . The dimension of the origin of these maps is allowed to be arbitrary, unlike both the classical -dimensional case of entire curves and the -codimensional case introduced in previous work of the second-named author with S. Marouani. The higher-dimensional generality necessitates the imposition of certain growth conditions, very different from those in Nevanlinna theory and those in works by de Thélin, Burns and Sibony on Ahlfors currents, on the entire holomorphic maps . The way to finding these growth conditions is revealed by certain special, possibly non-Kähler, Hermitian metrics in the spirit of Gromov’s Kähler hyperbolicity theory but in a higher-dimensional context. We then study several classes of examples, prove implications among our partial hyperbolicity notions, give a sufficient criterion for the existence of an Ahlfors current and a sufficient criterion for partial hyperbolicity in terms of the signs of two curvature-like objects introduced recently by the second-named author.
Cite this article
Hisashi Kasuya, Dan Popovici, Partially hyperbolic compact complex manifolds. Rev. Mat. Iberoam. (2025), published online first
DOI 10.4171/RMI/1555