Projective and affine structures in positive characteristic I: Chern class formulas and Characterizations of projective spaces
Abstract
This paper aims to develop a theory of projective and affine structures on higher-dimensional varieties in positive characteristic. This theory deals with Frobenius-projective and Frobenius-affine structures, which have been previously investigated in the case where the underlying space is a curve. We first provide a description of such structures in terms of Berthelot's higher-level differential operators. That description leads us to obtain a positive characteristic version of Gunning's formulas, which give necessary conditions on Chern classes for the existence of Frobenius-projective and Frobenius-affine structures, respectively. Finally, we establish some characterizations of projective spaces using Frobenius-projective structures.
Keywords
Cite
@article{arxiv.2011.04846,
title = {Projective and affine structures in positive characteristic I: Chern class formulas and Characterizations of projective spaces},
author = {Yasuhiro Wakabayashi},
journal= {arXiv preprint arXiv:2011.04846},
year = {2026}
}
Comments
This is the first of two papers obtained by dividing the content of the previous version. 49 pages