English

A variety that cannot be dominated by one that lifts

Algebraic Geometry 2019-03-14 v2

Abstract

We prove a precise version of a theorem of Siu and Beauville on morphisms to higher genus curves, and use it to show that if a variety XX in characteristic pp lifts to characteristic 00, then any morphism XCX \to C to a curve of genus g2g \geq 2 can be lifted along. We use this to construct, for every prime pp, a smooth projective surface XX over Fˉp\bar{\mathbb F}_p that cannot be rationally dominated by a smooth proper variety YY that lifts to characteristic 00.

Keywords

Cite

@article{arxiv.1902.07885,
  title  = {A variety that cannot be dominated by one that lifts},
  author = {Remy van Dobben de Bruyn},
  journal= {arXiv preprint arXiv:1902.07885},
  year   = {2019}
}

Comments

26 pages. Fixed typos, added references, and expanded introduction. This is the main result of the author's dissertation (2018)

R2 v1 2026-06-23T07:46:44.029Z