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arXiv 2404.04764math.AG
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正特征域上 Fano 三维簇的提升性与消失定理 II

Liftability and vanishing theorems for Fano threefolds in positive characteristic II

Tatsuro Kawakami, Hiromu Tanaka

AI总结:

本文研究正特征域上光滑 Fano 三维簇的提升性与上同调性质,证明当 Picard 数或 Fano 指数大于 1 时其具有拟 F-分裂性,从而在除特定极丰沛情形外建立 Akizuki–Nakano 消失、Hodge–de Rham 谱序列 E1-退化及晶体上同调无挠性。

摘要:

在本系列论文中,我们证明正特征域上的光滑 Fano 三维簇可提升到 Witt 向量环。此外,我们证明它们满足 Akizuki–Nakano 消失定理、Hodge 到 de Rham 谱序列的 $E_1$-退化,以及晶体上同调的无挠性。在本文中,除了当 $|-K_X|$ 为极丰沛且 Picard 群由 $ω_X$ 生成的情形之外,我们建立了这些结果。为此,我们证明当 Picard 数或 Fano 指数大于 1 时,任意光滑 Fano 三维簇是拟 $F$-分裂的。

英文摘要:

In our series of papers, we prove that smooth Fano threefolds in positive characteristic lift to the ring of Witt vectors. Moreover, we show that they satisfy Akizuki-Nakano vanishing, $E_1$-degeneration of the Hodge to de Rham spectral sequence, and torsion-freeness of Crystalline cohomologies. In this paper, we establish these results except when $|-K_X|$ is very ample and the Picard group is generated by $ω_X$. To this end, we show that an arbitrary smooth Fano threefold is quasi-$F$-split when the Picard number or the Fano index is larger than one.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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