Singularities of Theta Divisors, and the Birational Geometry of Irregular Varieties

Details Singularities of Theta Divisors, and the Birational Geometry of Irregular Varieties Singularities of Theta Divisors, and the Birational Geometry of Irregular Varieties

1996-03-21

arxiv.org/abs/alg-geom/9603017v1

Mathematics

Algebraic Geometry

19 pages, AMS-TeX, v. 2.1

Scientific paper

The purpose of this paper is to show how the generic vanishing theorems of M. Green and the second author can be used to settle several questions and conjectures concerning the geometry of irregular complex projective varieties. First, we prove a conjecture of Arbarello and DeConcini characterizing principally polarized abelian varieties whose theta divisors are singular in codimension one. Secondly, we study the holomorphic Euler characteristics of varieties of general type having maximal Albanese dimension: we verify a conjecture of Kollar for subvarieties of abelian varieties, but show that it fails in general. Finally, we give a surprisingly simple new proof of a fundamental theorem of Kawamata concerning the Albanese mapping of projective varieties of Kodaira dimension zero.

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