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arXiv 2108.08710math.AG
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阿贝尔曲面的导出同源与同源

Derived isogenies and isogenies for abelian surfaces

Fudan University(复旦大学);Universität Bielefeld(比勒费尔德大学)

Zhiyuan Li, Haitao Zou

AI总结:

本文通过引入扭曲导出等价,利用Tate同源定理和推广的Shioda技巧,证明了在特征≠2,3的代数闭域上阿贝尔曲面的导出同源等价于主同源。

摘要:

本文研究了阿贝尔曲面的扭曲Fourier-Mukai伙伴。继Huybrechts的工作[doi:10.4171/CMH/465]之后,我们引入了阿贝尔曲面之间的扭曲导出等价。我们证明在特征≠2,3的代数闭域上,存在阿贝尔曲面的扭曲导出Torelli定理。在复数域上,导出同源对应于第二上同调群之间的有理Hodge等距,这类似于Huybrechts和Fu-Vial关于K3曲面的工作。他们的证明依赖于复数域上的全局Torelli定理,而在正特征下该定理缺失。为克服此问题,我们首先将Shioda关于整Hodge结构的一个技巧推广到有理Hodge结构、ℓ-adic Tate模和F-晶体。然后利用Tate同源定理,通过同源给出阿贝尔曲面之间扭曲导出等价的刻画。作为推论,我们证明两个阿贝尔曲面主同源当且仅当它们导出同源。

英文摘要:

In this paper, we study the twisted Fourier-Mukai partners of abelian surfaces. Following the work of Huybrechts [doi:10.4171/CMH/465], we introduce the twisted derived equivalence between abelian surfaces. We show that there is a twisted derived Torelli theorem for abelian surfaces over algebraically closed fields with characteristic $\neq 2,3$. Over complex numbers, the derived isogenies correspond to rational Hodge isometries between the second cohomology groups, which is in analogy to the work of Huybrechts and Fu-Vial on K3 surfaces. Their proof relies on the global Torelli theorem over $\mathbb{C}$, which is missing in positive characteristics. To overcome this issue, we firstly extend a trick given by Shioda on integral Hodge structures, to rational Hodge structures, $\ell$-adic Tate modules and $F$-crystals. Then we make use of Tate's isogeny theorem to give a characterization of the twisted derived equivalences between abelian surfaces via isogenies. As a consequence, we show the two abelian surfaces are principally isogenous if and only if they are derived isogenous.

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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