Fukaya–Seidel–Smith's extremal-torus conjecture for ellipsoids

Let 0<a1a2an<0<a_1\le a_2\le\cdots\le a_n<\infty, and let E2n(a1,,an)E^{2n}(a_1,\dots,a_n) be the corresponding ellipsoid with standard symplectic form ωstd\omega_{\mathrm{std}}. A Lagrangian torus is extremal when its minimal symplectic area equals the Cieliebak–Mohnke capacity of the ambient symplectic manifold. Fukaya–Seidel–Smith's extremal-torus conjecture. Every extremal Lagrangian torus in (E2n(a1,,an),ωstd)(E^{2n}(a_1,\dots,a_n),\omega_{\mathrm{std}}) is contained entirely in the boundary E2n(a1,,an)\partial E^{2n}(a_1,\dots,a_n). The source attributes this conjecture to the work cited as sfe; the supplied text does not state that it has been resolved.

Sources & referencesView supporting material

Primary source

Shah Faisal and Yin Li, “Lagrangian capacity and chain level string topology”, arXiv:2606.20051 (2026).

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