Index lower-bound conjecture for branched CMC immersions
Let be a branched CMC -immersion, where has strictly positive sectional curvature, and let denote the genus of . Write and for the index and nullity of the relevant constrained second-variation operator. Index lower-bound conjecture. There exists a constant such that
For or a flat three-torus, the analogous expected bound is
The conjecture asserts that the index plus nullity is bounded below linearly by the Willmore-type energy and genus, complementing known index lower bounds in terms of genus. The stated flat-ambient version is presented as an expectation rather than an asserted theorem, and the source gives no resolution.
References
Primary source
Luca Seemungal and Ben Sharp, “Index estimates for constant mean curvature surfaces in three-manifolds by energy comparison”, arXiv:2411.02932 (2026).
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