English

Derived $F$-zips

Algebraic Geometry 2026-05-27 v5

Abstract

We define derived versions of FF-zips and associate a derived FF-zip to any proper, smooth morphism of schemes in positive characteristic. We analyze the stack of derived FF-zips and certain substacks. We make a connection to the classical theory and look at problems that arise when trying to generalize the theory to derived GG-zips and derived FF-zips associated to lci morphisms. As an application, we look at Enriques-surfaces and analyze the geometry of the moduli stack of Enriques-surfaces via the associated derived FF-zips. As there are Enriques-surfaces in characteristic 22 with non-degenerate Hodge-de Rham spectral sequence, this gives a new approach, which could previously not be obtained by the classical theory of FF-zips.

Keywords

Cite

@article{arxiv.2208.01517,
  title  = {Derived $F$-zips},
  author = {Can Yaylali},
  journal= {arXiv preprint arXiv:2208.01517},
  year   = {2026}
}

Comments

72 pages. Final version

R2 v1 2026-06-25T01:25:02.775Z