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arXiv · 2505.03546

A stacky comparison of the Hodge and Nygaard filtrations

Maximilian Hauck
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Abstract

We use the approach to $p$-adic cohomology theories via stacks recently developed by Drinfeld and Bhatt--Lurie to formulate a stacky version of a comparison result between the Nygaard filtration on prismatic cohomology and the Hodge filtration on de Rham cohomology by Bhatt--Lurie and thereby also obtain a generalisation in the case of smooth and proper $p$-adic formal schemes which allows for coefficients in an arbitrary gauge. In the process, we develop a stacky approach to diffracted Hodge cohomology as introduced by Bhatt--Lurie which also captures the conjugate filtration and the Sen operator. In the appendix, we also introduce a stack computing the conjugate filtration on absolute Hodge--Tate cohomology.

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Maximilian Hauck. 2025-07-18. A stacky comparison of the Hodge and Nygaard filtrations. https://arxiv.org/abs/2505.03546

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