Parametric Gromov width of Liouville domains

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.

Publication Details

Journal
ArXiv.org
Published
2025-04-21
Primary Topic
Nursing care and research
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article
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article

Parametric Gromov width of Liouville domains

ArXiv.org
Nursing care and research
article

Parametric Gromov width of Liouville domains

article en

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.

ArXiv.org
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Nursing care and research
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