English

Log canonical pairs with good augmented base loci

Algebraic Geometry 2019-02-20 v2

Abstract

Let (X,B)(X,B) be a projective log canonical pair such that BB is a \Q\Q-divisor, and that there is a surjective morphism f ⁣:XZf\colon X\to Z onto a normal variety ZZ satisfying: KX+B\QfMK_X+B\sim_\Q f^*M for some \Q\Q-divisor MM, and the augmented base locus B+(M){\bf{B_+}}(M) does not contain the image of any log canonical centre of (X,B)(X,B). We will show that (X,B)(X,B) has a good log minimal model. An interesting special case is when ff is the identity morphism.

Keywords

Cite

@article{arxiv.1305.3569,
  title  = {Log canonical pairs with good augmented base loci},
  author = {Caucher Birkar and Zhengyu Hu},
  journal= {arXiv preprint arXiv:1305.3569},
  year   = {2019}
}

Comments

17 pages; Final version to appear in Compositio Math

R2 v1 2026-06-22T00:17:08.881Z