On Numerical Nonvanishing for Generalized Log Canonical Pairs
On Numerical Nonvanishing for Generalized Log Canonical Pairs
复制标题
关于广义对数规范对的数值不消失
作者:
Jingjun Han;Wenfei Liu
The nonvanishing conjecture for projective log canonical pairs plays a key role in the minimal model program of higher dimensional algebraic geometry. The numerical nonvanishing conjecture considered in this paper is a weaker version of the usual nonvanishing conjecture, but valid in the more general setting of generalized log canonical pairs. We confirm it in dimension two. Under some necessary conditions we obtain effective versions of numerical nonvanishing for surfaces. Several applications are also discussed. In higher dimensions, we mainly consider the conjecture for generalized klt pairs $(X, B+mathbf{M})$, and reduce it to lower dimensions when $K_X+mathbf{M}_X$ is not pseudo-effective. Up to scaling the nef part, we prove the numerical nonvanishing for pseudo-effective generalized lc threefolds with rational singularities.
DOI:
10.14231/ag-2015-020
发表时间:
2014-06
期刊:
arXiv: Algebraic Geometry
影响因子:
--
作者:
Tobias Dorsch;Vladimir Lazi'c
通讯作者:
Tobias Dorsch;Vladimir Lazi'c
DOI:
10.4171/prims/56-2-3
发表时间:
2018-08
影响因子:
1.2
作者:
Vladimir Lazi'c;T. Peternell
通讯作者:
Vladimir Lazi'c;T. Peternell