Cieliebak–Mohnke extremal Lagrangian torus conjecture for the unit ball

Let an extremal Lagrangian torus in (Bˉ2n(1),ωstd)(\bar{B}^{2n}(1),\omega_{\mathrm{std}}) mean a Lagrangian torus whose symplectic energy attains the relevant Lagrangian capacity. Cieliebak–Mohnke's conjecture. Every extremal Lagrangian torus in the standard symplectic unit ball (Bˉ2n(1),ωstd)(\bar{B}^{2n}(1),\omega_{\mathrm{std}}) lies entirely on the boundary B2n(1)\partial B^{2n}(1). The conjecture is known in dimension four by work of Dimitroglou Rizell, and is proved in all dimensions in the present paper.

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Primary source

Shah Faisal, “Extremal Lagrangian tori in toric domains”, arXiv:2504.13076 (2026).

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