On log minimal models and Zariski decompositions II

preprint2013arXivOpen access

Abstract

We continue our study of the relation between log minimal models and various types of Zariski decompositions. Let (X,B)(X,B) be a projective log canonical pair. We will show that (X,B)(X,B) has a log minimal model if either KX+BK_X+B birationally has a Nakayama-Zariski decomposition with nef positive part, or that KX+BK_X+B is big and birationally it has a Fujita or CKM Zariski decomposition. Along the way we introduce polarized pairs (X,B+P)(X,B+P) where (X,B)(X,B) is a usual projective pair and PP is nef, and study the birational geometry of such pairs.

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