Bergman kernels and the pseudoeffectivity of relative canonical bundles

Details Bergman kernels and the pseudoeffectivity of relative canonical bundles Bergman kernels and the pseudoeffectivity of relative canonical bundles

2007-03-12

arxiv.org/abs/math/0703344v4

Mathematics

Algebraic Geometry

This is the third revision

Scientific paper

The main result of the present article is a (practically optimal) criterium for the pseudoeffectivity of the twisted relative canonical bundles of surjective projective maps. Our theorem has several applications in algebraic geometry; to start with, we obtain the natural analytic generalization of some semipositivity results due to E. Viehweg and F. Campana. As a byproduct, we give a simple and direct proof of a recent result due to C. Hacon--J. McKernan, S. Takayama and H. Tsuji concerning the extension of twisted pluricanonical forms. More applications will be offered in the sequel of this article.

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