L^2 Castelnuovo-de Franchis, the cup product lemma, and filtered ends of Kaehler manifolds

Details L^2 Castelnuovo-de Franchis, the cup product lemma, and filtered ends of Kaehler manifolds L^2 Castelnuovo-de Franchis, the cup product lemma, and filtered ends of Kaehler manifolds

2007-11-07

arxiv.org/abs/0711.1155v1

Mathematics

Differential Geometry

Scientific paper

Simple approaches to the proofs of the L^2 Castelnuovo-de Franchis theorem and the cup product lemma which give new versions are developed. For example, suppose u and v are two linearly independent closed holomorphic 1-forms on a bounded geometry connected complete Kaehler manifold X with v in L^2. According to a version of the L^2 Castelnuovo-de Franchis theorem obtained in this paper, if u and v are pointwise linearly dependent, then there exists a surjective proper holomorphic mapping of X onto a Riemann surface for which u and v are pull-backs. Previous versions required both forms to be in L^2.

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