Li–Naber quantitative stratification conjecture for Alexandrov spaces

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Let Alexn(−1)\text{Alex}^n(-1) denote the nn-dimensional Alexandrov spaces with curvature at least −1-1. For 0≤k≤n−10\le k\le n-1, let Sϵk(X)\mathcal{S}^k_\epsilon(X) be the set of points whose tangent cone is ϵ\epsilon-away from splitting off \mathdsRk+1\mathds{R}^{k+1}, and let B1B_1 be the unit ball. Li–Naber's conjecture. There is a constant C(n)C(n) such that, for every X∈Alexn(−1)X\in\text{Alex}^n(-1),

Hk(Sϵk(X)∩B1)<C(n)ϵ1−(n−k).\mathcal{H}^{k}(\mathcal{S}^{k}_\epsilon(X)\cap B_1)<C(n)\epsilon^{1-(n-k)}.

This would sharpen the known bound Hk(Sϵk(X)∩B1)≤C(n,ϵ)\mathcal{H}^k(\mathcal{S}^k_\epsilon(X)\cap B_1)\le C(n,\epsilon) by specifying its dependence on ϵ\epsilon. The source attributes the conjecture to Li and Naber and gives no resolution.

References

Primary source

Nan Li, “Quantitative estimates on the C^2-singular sets in Alexandrov spaces”, arXiv:2306.03382 (2023).

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