English

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,

R2 v1 2026-06-28T16:57:24.694Z