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Integral p-adic Hodge theory of formal schemes in low ramification
Algebra & Number Theory  (IF0.938),  Pub Date : 2021-05-29, DOI: 10.2140/ant.2021.15.1043
Yu Min

We prove that for any proper smooth formal scheme 𝔛 over 𝒪K, where 𝒪K is the ring of integers in a complete discretely valued nonarchimedean extension K of p with perfect residue field k and ramification degree e, the i-th Breuil–Kisin cohomology group and its Hodge–Tate specialization admit nice decompositions when ie < p 1. Thanks to the comparison theorems in the recent works of Bhatt, Morrow and Scholze (2018, 2019), we can then get an integral comparison theorem for formal schemes when the cohomological degree i satisfies ie < p 1, which generalizes the case of schemes under the condition (i + 1)e < p 1 proven by Fontaine and Messing (1987) and Caruso (2008).