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arXiv 1608.07142math.AGmath.NT
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关于$Λ$ -环上的$q$ -de Rham上同调

On $q$-de Rham cohomology via $Λ$-rings

J. P. Pridham

摘要:

我们表明,Aomoto的$q$ -变形的德拉姆上同调作为一个自然的上同调理论$Λ$ -环。此外,$q$ -de Rham上同调的Scholze $(q-1)$ -adic完备化只依赖于每个残基特征的Adams运算.这给出了一个完全函子上同调理论,包括提升的Cartier同构,光滑的形式概形的混合特征配备了一个合适的提升的Frobenius。如果我们附加$q$的$p$ -幂根,则所得到的理论甚至独立于Frobenius的这些提升,从而改进了Bhatt、Morrow和Scholze的比较。

英文摘要:

We show that Aomoto's $q$-deformation of de Rham cohomology arises as a natural cohomology theory for $Λ$-rings. Moreover, Scholze's $(q-1)$-adic completion of $q$-de Rham cohomology depends only on the Adams operations at each residue characteristic. This gives a fully functorial cohomology theory, including a lift of the Cartier isomorphism, for smooth formal schemes in mixed characteristic equipped with a suitable lift of Frobenius. If we attach $p$-power roots of $q$, the resulting theory is independent even of these lifts of Frobenius, refining a comparison by Bhatt, Morrow and Scholze.

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