English

Duality between Cartier crystals and perverse $\mathbb{F}_p$-sheaves, and application to generic vanishing

Algebraic Geometry 2025-06-17 v2

Abstract

We show that on any Noetherian FF-finite Fp\mathbb{F}_p-scheme, there is an anti-equivalence of categories between Cartier crystals and \'etale perverse Fp\mathbb{F}_p-sheaves, commuting with derived proper pushforwards. We use this duality to construct an upper shriek functor for Cartier crystals, and give new proofs of Kashiwara's equivalence and the finite length of Cartier crystals. Finally, we deduce a generic vanishing statement for perverse Fp\overline{\mathbb{F}}_p-sheaves on abelian varieties of characteristic p>0p > 0, reminiscent of the characteristic zero and ll-adic statements.

Keywords

Cite

@article{arxiv.2306.05378,
  title  = {Duality between Cartier crystals and perverse $\mathbb{F}_p$-sheaves, and application to generic vanishing},
  author = {Jefferson Baudin},
  journal= {arXiv preprint arXiv:2306.05378},
  year   = {2025}
}

Comments

Comments are more than welcome! Version 2: Added references and corrected typos and minor erros