On the large-scale geometry of domains in an exact symplectic 4-manifold
We show that the space of open subsets of any complete and exact symplectic $4$-manifold has infinite dimension with respect to the symplectic Banach-Mazur distance; the quasi-flats we construct take values in the set of dynamically convex domains. In the case of $\mathbb{R}^4$, we therefore obtain...
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Zusammenfassung: | We show that the space of open subsets of any complete and exact symplectic
$4$-manifold has infinite dimension with respect to the symplectic Banach-Mazur
distance; the quasi-flats we construct take values in the set of dynamically
convex domains. In the case of $\mathbb{R}^4$, we therefore obtain the
following contrast: the space of convex domains is quasi-isometric to a plane,
while the space of dynamically convex ones has infinite dimension.
In the case of $T^* S^2$, a variant of our construction resolves a conjecture
of Stojisavljevi\'{c} and Zhang, asserting that the space of star-shaped
domains in $T^* S^2$ has infinite dimension. Another corollary is that the
space of contact forms giving the standard contact structure on $S^3$ has
infinite dimension with respect to the contact Banach-Mazur distance. |
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DOI: | 10.48550/arxiv.2311.06421 |