Campana rational connectedness and weak approximation

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.

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Publication Details

Journal
Algebraic geometry
Published
2026-08-21
DOI
https://doi.org/10.14231/ag-2026-021
Primary Topic
Advanced Topology and Set Theory
Type
article
Field-Weighted Citation Impact
0.00
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article

Campana rational connectedness and weak approximation

Qile Chen, Sho Tanimoto, Brian Lehmann
Algebraic geometry
Advanced Topology and Set Theory
article

Campana rational connectedness and weak approximation

Qile Chen, Sho Tanimoto, Brian Lehmann
article en

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.

Algebraic geometry
Openalex Percentile: Top 95%
Advanced Topology and Set Theory
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