Lagrangian capacity and chain level string topology
arXiv:2606.20051
The paper establishes sharp upper bounds for Lagrangian capacities of Liouville domains, proves that convex or concave toric domains have capacity equal to their diagonal (settling the Cieliebak‑Mohnke conjecture for ellipsoids), and derives new bounds for Lagrangian width in various Weinstein manifolds using S¹‑equivariant techniques.
Abstract
We derive upper bounds for the Lagrangian capacities of Liouville domains with finite Gutt--Hutchings capacities and show that the Lagrangian capacity of a convex or concave toric domain of arbitrary dimension equals its diagonal. In particular, this completely settles the conjecture of Cieliebak-Mohnke on the Lagrangian capacity of ellipsoids. Our proof is based on an -equivariant variant of the techniques of Fukaya and Irie, and does not use holomorphic curves with local tangency constraints, which would inevitably cause transversality issues. Moreover, we show that any extremal Lagrangian torus in an -dimensional ellipsoid must lie on the boundary. Applications of our results and techniques include new upper bounds on the Lagrangian width for aspherical Lagrangians in Liouville manifolds and the first computations of the Lagrangian capacities for many non-subcritical Weinstein domains in dimensions 4 and 6.
v2: 72 pages, 5 figures. Minor corrections, added a result on the quantitative Arnold chord conjecture