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arXiv 2104.12970math.AG
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一个正特征的上同调非阿贝尔Hodge定理

A Cohomological Non Abelian Hodge Theorem in Positive Characteristic

Mark Andrea A. de Cataldo, Siqing Zhang

摘要:

我们从代数闭的正特征$p>0$基域上的曲线开始。利用特殊化技巧,在适当的自然互质条件下,证明了Higgs丛的模空间与曲线上的联络空间之间的上同调Simpson对应.我们还证明了一个新的$p$ -乘法周期性的Dolbeault模空间的度不同的一个因素$p$的上同调环。通过耦合这个$p$ -周期性的特征$p$与提升/专业化技术的混合特征,我们发现,在任意的特征,上同调环同构之间的上同调环的Dolbeault模空间的不同程度互质的秩。有趣的是,这最后一个结果证明如下:我们证明了一个较弱的版本在正特征;我们提升和加强较弱的版本的结果在特征零;最后,我们专门的结果,以积极的特征。我们所研究的模空间允许某些自然态射(希钦、德·拉姆-希钦、霍奇-希钦),我们发现的所有上同调环同构都是由此产生的反常勒雷滤的滤同构。

英文摘要:

We start with a curve over an algebraically closed ground field of positive characteristic $p>0$. By using specialization techniques, under suitable natural coprimality conditions, we prove a cohomological Simpson Correspondence between the moduli space of Higgs bundles and the one of connections on the curve. We also prove a new $p$-multiplicative periodicity concerning the cohomology rings of Dolbeault moduli spaces of degrees differing by a factor of $p$. By coupling this $p$-periodicity in characteristic $p$ with lifting/specialization techniques in mixed characteristic, we find, in arbitrary characteristic, cohomology ring isomorphisms between the cohomology rings of Dolbeault moduli spaces for different degrees coprime to the rank. It is interesting that this last result is proved as follows: we prove a weaker version in positive characteristic; we lift and strengthen the weaker version to the result in characteristic zero; finally, we specialize the result to positive characteristic. The moduli spaces we work with admit certain natural morphisms (Hitchin, de Rham-Hitchin, Hodge-Hitchin), and all the cohomology ring isomorphisms we find are filtered isomorphisms for the resulting perverse Leray filtrations.

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