English

Parametric Gromov width of Liouville domains

Symplectic Geometry 2025-05-29 v2

Abstract

The classical Gromov width measures the largest symplectic ball embeddable into a symplectic manifold; inspired by the symplectic camel problem, we generalize this to ask how large a symplectic ball can be embedded as a family over a parameter space NN. Given a smooth map f:NΩf: N \to \Omega, where Ω\Omega is a symplectic manifold, we define the \emph{parametric Gromov width} Gr(f,Ω)\mathrm{Gr}(f,\Omega) as the supremum of capacities a>0a>0 for which there exists a family of balls, parametrized by NN, of capacity aa whose centers trace out the map ff. For Liouville domains Ω\Omega, we establish upper bounds on Gr(f,Ω)\mathrm{Gr}(f,\Omega) using the Floer cohomology persistence module associated to Ω\Omega. Specializing to fiberwise starshaped domains in the cotangent bundle TMT^*M, we derive computable bounds via filtered string topology. Specific examples of Ω\Omega -- including disk cotangent bundles of thin ellipsoids, open books, and tori -- demonstrate our bounds, and reveal constraints on parameterized symplectic embeddings beyond the classical Gromov width.

Keywords

Cite

@article{arxiv.2504.15207,
  title  = {Parametric Gromov width of Liouville domains},
  author = {Filip Broćić and Dylan Cant},
  journal= {arXiv preprint arXiv:2504.15207},
  year   = {2025}
}

Comments

97 pages. Replacement generalizes main definition and provides further applications