Helmke's conjecture on local global generation of adjoint line bundles

Work over an algebraically closed field kk of characteristic zero. Let XX be a smooth projective variety of dimension nn, let xXx\in X be a point, and let LL be an ample line bundle. Assume that

Ln>nnL^n>n^n

and that

LdZndL^d\cdot Z\geq n^d

for every subvariety ZXZ\subset X containing xx, where d=dimZ<nd=\dim Z<n. Helmke's conjecture. The line bundle OX(KX+mL)\mathcal{O}_X(K_X+mL) is globally generated at xx. This stronger conjecture is motivated by results of Reider, Ein and Lazarsfeld, Fujita, Helmke, and others on effective bounds for adjoint linear systems. The source gives no resolution of this conjecture.

Sources & referencesView supporting material

Primary source

Fei Ye and Zhixian Zhu, “Global Generation of Adjoint Line Bundles on Projective 5-folds”, arXiv:1405.0678 (2016).

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