Conformal maximality conjecture for free boundary harmonic annuli

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For any T⩾T1T\geqslant T_1, let AT=[0,T]×S1\mathbb{A}_T=[0,T]\times\mathbb{S}^1 and let CT\mathcal{C}_T be the conformal class containing the flat metric on [0,T]×S1[0,T]\times\mathbb{S}^1. Let Ψ^T ⁣:AT→B3\hat\Psi_T\colon\mathbb{A}_T\to\mathbb{B}^3 be the free boundary harmonic map obtained in the theorem, and let E(Ψ^T)E(\hat\Psi_T) denote its energy. Conformal maximality conjecture. Then

sup⁡g∈CTσˉ1(AT,g)=2E(Ψ^T).\sup_{g\in\mathcal{C}_T}\bar\sigma_1(\mathbb{A}_T,g)=2E(\hat\Psi_T).

In particular, for these conformal classes, σˉ1\bar\sigma_1-conformally maximal pairs can be chosen to be rotationally symmetric. This is the precise formulation of the conjectured maximality of the constructed annular metrics, and it remains open in the supplied text.

References

Primary source

Mikhail Karpukhin and Antoine Métras, “Laplace and Steklov extremal metrics via n-harmonic maps”, arXiv:2103.15204 (2021).

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