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The $A_{\text{inf}}$-cohomology in the semistable case

Part of: (Co)homology theory Arithmetic problems. Diophantine geometry

Published online by Cambridge University Press:  09 September 2019

Kęstutis Česnavičius  and
Teruhisa Koshikawa
Kęstutis Česnavičius
Affiliation:
CNRS, UMR 8628, Laboratoire de Mathématiques d’Orsay, Univ. Paris-Sud, Université Paris-Saclay, 91405 Orsay, France email kestutis@math.u-psud.fr
Teruhisa Koshikawa
Affiliation:
Research Institute for Mathematical Sciences, Kyoto University, Kyoto 606-8502, Japan email teruhisa@kurims.kyoto-u.ac.jp
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Abstract

For a proper, smooth scheme $X$ over a $p$-adic field $K$, we show that any proper, flat, semistable ${\mathcal{O}}_{K}$-model ${\mathcal{X}}$ of $X$ whose logarithmic de Rham cohomology is torsion free determines the same ${\mathcal{O}}_{K}$-lattice inside $H_{\text{dR}}^{i}(X/K)$ and, moreover, that this lattice is functorial in $X$. For this, we extend the results of Bhatt–Morrow–Scholze on the construction and the analysis of an $A_{\text{inf}}$-valued cohomology theory of $p$-adic formal, proper, smooth ${\mathcal{O}}_{\overline{K}}$-schemes $\mathfrak{X}$ to the semistable case. The relation of the $A_{\text{inf}}$-cohomology to the $p$-adic étale and the logarithmic crystalline cohomologies allows us to reprove the semistable conjecture of Fontaine–Jannsen.

Keywords

comparison isomorphismintegral cohomologyp-adic Hodge theory

MSC classification

Primary: 14G20: Local ground fields
Secondary: 14G22: Rigid analytic geometry 14F20: Étale and other Grothendieck topologies and (co)homologies 14F30: $p$-adic cohomology, crystalline cohomology 14F40: de Rham cohomology
Type
Research Article
Information
Compositio Mathematica , Volume 155 , Issue 11 , November 2019 , pp. 2039 - 2128
Copyright
© The Authors 2019 

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