Campana rational connectedness and weak approximation
Algebraic Geometry
2025-04-24 v2
Abstract
Campana introduced a notion of Campana rational connectedness for Campana orbifolds. Given a Campana fibration over a complex curve, we prove that a version of weak approximation for Campana sections holds at places of good reduction when the general fiber satisfies a slightly stronger version of Campana rational connectedness. Campana also conjectured that any Fano orbifold is Campana rationally connected; we verify a stronger statement for toric Campana orbifolds. A key tool in our study is log geometry and moduli stacks of stable log maps.
Keywords
Cite
@article{arxiv.2406.04991,
title = {Campana rational connectedness and weak approximation},
author = {Qile Chen and Brian Lehmann and Sho Tanimoto},
journal= {arXiv preprint arXiv:2406.04991},
year = {2025}
}
Comments
minor revision, 43 pages, to appear in Algebraic Geometry,