Higher displays arising from filtered de Rham-Witt complexes

preprint2020arXivOpen access

Abstract

For a smooth projective scheme XX over a ring RR on which pp is nilpotent that meets some general assumptions we prove that the crystalline cohomology is equipped with the structure of a higher display which is a relative version of Fontaine's strongly divisible lattices. Frobenius-divisibilty is induced by the Nygaard filtration on the relative de Rham-Witt complex. For a nilpotent PD-thickening S/RS/R we also consider the associated relative display and can describe it explicitly by a relative version of the Nygaard filtration on the de Rham-Witt complex associated to a lifting of XX over SS. We prove that there is a crystal of relative displays if moreover the mod pp reduction of XX has a smooth and versal deformation space.

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