English

Coarse distance from dynamically convex to convex

Symplectic Geometry 2023-08-30 v2 Dynamical Systems

Abstract

Chaidez and Edtmair have recently found the first example of dynamically convex domains in R4\mathbb R^4 that are not symplectomorphic to convex domains (called symplectically convex domains), answering a long-standing open question. In this paper, we discover new examples of such domains without referring to Chaidez-Edtmair's criterion. We also show that these domains are arbitrarily far from the set of symplectically convex domains in R4\mathbb R^4 with respect to the coarse symplectic Banach-Mazur distance by using an explicit numerical criterion for symplectic non-convexity.

Keywords

Cite

@article{arxiv.2308.06604,
  title  = {Coarse distance from dynamically convex to convex},
  author = {Julien Dardennes and Jean Gutt and Vinicius G. B. Ramos and Jun Zhang},
  journal= {arXiv preprint arXiv:2308.06604},
  year   = {2023}
}

Comments

minor changes; add Remarks 1.1, 1.4, and 1.5

R2 v1 2026-06-28T11:54:21.823Z