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 in characteristic lifts to characteristic , then any morphism to a curve of genus can be lifted along. We use this to construct, for every prime , a smooth projective surface over that cannot be rationally dominated by a smooth proper variety that lifts to characteristic .
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)