Parametric Gromov width of Liouville domains

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 $N$. Given a smooth map $f: N \to \Omega$, where $\Omega$ is a symplectic manifold, we define the \emph{parametric Gromov width} $\mathrm{Gr}(f,\Omega)$ as the supremum of capacities $a>0$ for which there exists a family of balls, parametrized by $N$, of capacity $a$ whose centers trace out the map $f$. For Liouville domains $\Omega$, we establish upper bounds on $\mathrm{Gr}(f,\Omega)$ using the Floer cohomology persistence module associated to $\Omega$. Specializing to fiberwise starshaped domains in the cotangent bundle $T^*M$, we derive computable bounds via filtered string topology. Specific examples of $\Omega$ -- 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.