English

On the strong Arnold chord conjecture for convex contact forms

Symplectic Geometry 2025-12-08 v3

Abstract

The original Arnold chord conjecture states that every closed Legendrian submanifold of the standard contact sphere S2n1S^{2n-1} admits a Reeb chord with distinct endpoints with respect to any contact form. In this paper, we prove this conjecture for contact forms induced by strictly convex embeddings into R2n\mathbb{R}^{2n} under the assumption that minimal periodic Reeb orbits are of Morse-Bott type. We also provide a counterexample when the convexity condition is not satisfied.

Keywords

Cite

@article{arxiv.2304.07016,
  title  = {On the strong Arnold chord conjecture for convex contact forms},
  author = {Jungsoo Kang},
  journal= {arXiv preprint arXiv:2304.07016},
  year   = {2025}
}

Comments

27 pages, 4 figures, added a counterexample to the strong Arnold chord conjecture in the starshaped case (pointed out by Michael Hutchings), expanded explanations and added a Morse-Bott type assumption

R2 v1 2026-06-28T10:05:49.413Z