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arXiv 1809.01217math.AGmath.AC
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任意域上线丛的Gamma构造和渐近不变量

The gamma construction and asymptotic invariants of line bundles over arbitrary fields

Takumi Murayama

摘要:

将复射影簇上线丛的渐近不变量的结果推广到任意域上的射影簇。要做到这一点,在不完美的领域,我们证明了一个计划理论版本的伽马建设的Hochster和Huneke减少到基域是$F$有限的设置。我们的主要结果使用伽马建设扩展的满度标准的de Fernex,Küronya,和Lazarsfeld使用渐近上同调函数的任意域上的投影簇,这是以前只知道复杂的投影簇。我们还将Nakayama的限制基轨迹的描述扩展到任意域上的klt或强$F$ -正则簇。

英文摘要:

We extend results on asymptotic invariants of line bundles on complex projective varieties to projective varieties over arbitrary fields. To do so over imperfect fields, we prove a scheme-theoretic version of the gamma construction of Hochster and Huneke to reduce to the setting where the ground field is $F$-finite. Our main result uses the gamma construction to extend the ampleness criterion of de Fernex, Küronya, and Lazarsfeld using asymptotic cohomological functions to projective varieties over arbitrary fields, which was previously known only for complex projective varieties. We also extend Nakayama's description of the restricted base locus to klt or strongly $F$-regular varieties over arbitrary fields.

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