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Prismatic crystals and $q$-Higgs fields

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arxiv 2403.11676 v1 pith:46CC7JPT submitted 2024-03-18 math.AG

classification math.AG
keywords prismaticcohomologyhiggsboundedcrystalcrystallinedescriptionprism
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abstract

Similarly to the theory of crystalline cohomology, we give a local description of a prismatic crystal and its cohomology in terms of a $q$-Higgs module and the associated $q$-Higgs complex on the bounded prismatic envelope of an embedding into a framed smooth algebra, when the base bounded prism is defined over the $q$-crystalline prism. We also discuss its behavior under the scalar extension by the Frobenius lifting and tensor products, and a global description of the cohomology of a prismatic crystal via Zariski cohomological descent.

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  1. Prismatic cohomology and $A_{\inf}$-cohomology with coefficients

    math.AG 2025-09 conditional novelty 7.0 of 10

    Prismatic cohomology of a locally finite free prismatic crystal is canonically isomorphic to A_inf-cohomology of the associated relative Breuil-Kisin-Fargues module, for smooth p-adic formal schemes over the ring of i...

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