The index and finiteness conjecture for embedded minimal surfaces in the three-sphere

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Let γ∈N\gamma\in\mathbb{N}, and let Σ⊂S3\Sigma\subset\mathbb{S}^3 be a closed embedded minimal surface of genus γ\gamma. Denote its Morse index by Ind⁡(Σ)\operatorname{Ind}(\Sigma), and let ξγ,1\boldsymbol{\xi}_{\gamma,1} be the Lawson surface of genus γ\gamma. For kexcess∈Nk_{\mathrm{excess}}\in\mathbb{N}, consider the closed embedded minimal surfaces in the round three-sphere with index at most 2γ+3+kexcess2\gamma+3+k_{\mathrm{excess}}. The index and finiteness conjecture. The index satisfies

Ind⁡(Σ)≥2γ+3,\operatorname{Ind}(\Sigma)\geq 2\gamma+3,

with equality if and only if Σ\Sigma is congruent to the Lawson surface ξγ,1\boldsymbol{\xi}_{\gamma,1}. Moreover, for any given kexcess∈Nk_{\mathrm{excess}}\in\mathbb{N}, the number of such surfaces is bounded above independently of γ\gamma. This would generalize Urbano's result to arbitrary genus; the proposed lower bound is substantially stronger than the best currently known lower bound, and the conjecture is motivated by index computations for minimal surface doublings.

References

Primary source

Nikolaos Kapouleas and Jiahua Zou, “Index and nullity of minimal surface doublings, I”, arXiv:2512.07734 (2025).

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