English

The derived $\infty$-category of Frobenius modules

Algebraic Geometry 2025-10-28 v1 Commutative Algebra

Abstract

We prove that for XX a quasi-compact Fp\mathbb{F}_p-scheme with affine diagonal (e.g.\ XX quasi-compact and separated) there is a t-exact equivalence D(Frob(QCoh(X),F))Frob(D(QCoh(X)),D(F))\mathcal D(\mathrm{Frob}(\mathrm{QCoh}(X),F_*)) \to \mathrm{Frob}(\mathcal D(\mathrm{QCoh}(X)),\mathcal D(F_*)) of stable \infty-categories. Here, Frob(,)\mathrm{Frob}(-,-) denotes the \infty-category of generalized Frobenius modules as introduced in arXiv:2410.17102. This generalizes our result from arXiv:2410.17102, where we proved the above for regular Noetherian Fp\mathbb{F}_p-schemes. As a byproduct we prove that the derived \infty-category of Frobenius (and Cartier) modules satisfies Zariski descent.

Keywords

Cite

@article{arxiv.2510.23267,
  title  = {The derived $\infty$-category of Frobenius modules},
  author = {Klaus Mattis and Timo Weiß},
  journal= {arXiv preprint arXiv:2510.23267},
  year   = {2025}
}

Comments

24 pages, comments welcome!