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Purity for Hodge-Tate representations

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Abstract

We prove that a kind of purity holds for Hodge-Tate representations of the fundamental group of the generic fiber of a semi-stable scheme over a complete discrete valuation ring of mixed characteristic with perfect residue field. As an application, we see that the relative p-adic étale cohomology with proper support of a scheme separated of finite type over the generic fiber is Hodge-Tate if it is locally constant.

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Tsuji, T. Purity for Hodge-Tate representations. Math. Ann. 350, 829–866 (2011). https://doi.org/10.1007/s00208-010-0582-7

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