De Rham affineness of the Nygaard filtered prismatization in positive characteristic
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866914358219505664 |
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| author | Sahai, Shubhankar |
| author_facet | Sahai, Shubhankar |
| contents | Let $k$ be a perfect ring of characteristic $p>0$, and let $R$ be an animated $k$-algebra. This note aims to show that the Nygaard filtered prismatization $R^{\mathrm{Nyg}}$ of $R$ is naturally isomorphic, as a stack over $k^{\mathrm{Nyg}}$, to the relative spectrum over $k^{\mathrm{Nyg}}$ of the Rees algebra of the Nygaard filtered prismatic cohomology of $R$ relative to $k$. In doing so, we axiomatise the functorial affineness property displayed by the relative Nygaard filtered prismatization, and dub it de Rham affineness after the fundamental example of the functor sending an animated ring to its relative de Rham stack. While we treat this concept as an organising tool for the author's forthcoming work on the syntomification of Frobenius liftable schemes, we are able to frame some questions based on a structural result of independent interest: a functor to stacks which is de Rham affine often arises via ring stacks through transmutation. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_19348 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | De Rham affineness of the Nygaard filtered prismatization in positive characteristic Sahai, Shubhankar Algebraic Geometry Algebraic Topology Number Theory Primary 14F30, Secondary 14F40, 14G17, 14G45 Let $k$ be a perfect ring of characteristic $p>0$, and let $R$ be an animated $k$-algebra. This note aims to show that the Nygaard filtered prismatization $R^{\mathrm{Nyg}}$ of $R$ is naturally isomorphic, as a stack over $k^{\mathrm{Nyg}}$, to the relative spectrum over $k^{\mathrm{Nyg}}$ of the Rees algebra of the Nygaard filtered prismatic cohomology of $R$ relative to $k$. In doing so, we axiomatise the functorial affineness property displayed by the relative Nygaard filtered prismatization, and dub it de Rham affineness after the fundamental example of the functor sending an animated ring to its relative de Rham stack. While we treat this concept as an organising tool for the author's forthcoming work on the syntomification of Frobenius liftable schemes, we are able to frame some questions based on a structural result of independent interest: a functor to stacks which is de Rham affine often arises via ring stacks through transmutation. |
| title | De Rham affineness of the Nygaard filtered prismatization in positive characteristic |
| topic | Algebraic Geometry Algebraic Topology Number Theory Primary 14F30, Secondary 14F40, 14G17, 14G45 |
| url | https://arxiv.org/abs/2512.19348 |