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arXiv 1802.03261math.AGmath.KTmath.NT
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拓扑霍赫希尔德同调与积分$p$ -adic Hodge理论

Topological Hochschild homology and integral $p$-adic Hodge theory

Bhargav Bhatt, Matthew Morrow, Peter Scholze

摘要:

在混合特征和等特征$p$中,我们定义了拓扑霍赫希尔德同调及其变体的滤子.这种过滤是一个类似的过滤代数PDMATHAMN-理论的motivic上同调。它的渐变片段在混合特性上与我们以前工作中构造的复体$AΩ$有关,在等特性上与结晶上同调$p$有关。我们构造了$\mathrm{THH}$上的滤子是通过平坦下降到半完全类环。作为一个应用,我们改进了$AΩ$ -复形的构造,给出了$\mathcal O_K$上适当光滑形式格式的Breuil-Kisin模的上同调构造,其中$K$是$\mathbb Q_p$的具有完美剩余域的离散值扩张.作为另一个应用,我们为一大类$\mathbb Z_p$ -代数上的所有$n\geq 0$定义了合取层$\mathbb Z_p(n)$,并根据混合特征中的$p$ -adic附近圈以及等特征$p$中的对数de~Rham-Witt层来识别它们。

英文摘要:

In mixed characteristic and in equal characteristic $p$ we define a filtration on topological Hochschild homology and its variants. This filtration is an analogue of the filtration of algebraic $K$-theory by motivic cohomology. Its graded pieces are related in mixed characteristic to the complex $AΩ$ constructed in our previous work, and in equal characteristic $p$ to crystalline cohomology. Our construction of the filtration on $\mathrm{THH}$ is via flat descent to semiperfectoid rings. As one application, we refine the construction of the $AΩ$-complex by giving a cohomological construction of Breuil--Kisin modules for proper smooth formal schemes over $\mathcal O_K$, where $K$ is a discretely valued extension of $\mathbb Q_p$ with perfect residue field. As another application, we define syntomic sheaves $\mathbb Z_p(n)$ for all $n\geq 0$ on a large class of $\mathbb Z_p$-algebras, and identify them in terms of $p$-adic nearby cycles in mixed characteristic, and in terms of logarithmic de~Rham-Witt sheaves in equal characteristic $p$.

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