Cieliebak–Mohnke's ellipsoid capacity conjecture

Let 0<a1a2an<0<a_1\le a_2\le\cdots\le a_n<\infty, and let E2n(a1,,an)CnE^{2n}(a_1,\dots,a_n)\subset\mathbb{C}^n be the ellipsoid defined by

E2n(a1,,an)={(z1,,zn)Cn | i=1nπzi2ai1}.E^{2n}(a_1,\dots,a_n)=\left\{(z_1,\dots,z_n)\in\mathbb{C}^n\ \middle|\ \sum_{i=1}^n\frac{\pi|z_i|^2}{a_i}\le1\right\}.

For a closed Lagrangian torus L(X,ω)L\subset(X,\omega), set

Amin(L)=infAπ2(X,L)Aω>0Aω,A_{\min}(L)=\inf_{\substack{A\in\pi_2(X,L)\\ \int_A\omega>0}}\int_A\omega,

and define the Cieliebak–Mohnke capacity by

CCM(X,ω)=supL(X,ω)L Lagrangian torusAmin(L).C^{\mathrm{CM}}(X,\omega)=\sup_{\substack{L\subset(X,\omega)\\ L\ \operatorname{Lagrangian\ torus}}}A_{\min}(L).

A torus is extremal when Amin(L)=CCM(X,ω)A_{\min}(L)=C^{\mathrm{CM}}(X,\omega). Cieliebak–Mohnke's ellipsoid capacity conjecture.

CCM(E2n(a1,,an))=(1a1+1a2++1an)1.C^{\mathrm{CM}}\left(E^{2n}(a_1,\dots,a_n)\right)=\left(\frac1{a_1}+\frac1{a_2}+\cdots+\frac1{a_n}\right)^{-1}.

This is attributed in the source to Cieliebak and Mohnke and gives a proposed explicit formula for the Lagrangian capacity of ellipsoids; its resolution is not stated in the supplied text.

Sources & referencesView supporting material

Primary source

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

Additional references

2 papers in this index state this conjecture (2005–2026). The statement above is taken from the most recent of them; the others are arXiv:math/0506191.

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