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arXiv · 2610.41449

The regular set of Ricci limit spaces

Tianyin Ren
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Abstract

Let $(X,d,p)$ be a nontrivial pointed Gromov--Hausdorff limit of complete connected Riemannian $n$-manifolds satisfying $\operatorname{Ric}\geq-(n-1)g$. For $1\leq j\leq n$, set \[ \mathcal{R}_j(X) = \bigl\{x\in X:\text{ every tangent cone at } x \text{ is isometric to } \mathbb{R}^j\bigr\}, \qquad \mathcal{R}(X)=\bigsqcup_{j=1}^n\mathcal{R}_j(X). \] We prove that there is a unique $k$ such that $\mathcal{R}(X)=\mathcal{R}_k(X)$, answering the pointwise regular-dimension question originating in Cheeger and Colding's work~\cite[p408]{CC97}. We construct a volume-corrected heat entropy on RCD space and identify the distributional logarithmic-density defect $\operatorname{tr}(\operatorname{Hess} f)-Δf$ by Green-volume regularization.

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Tianyin Ren. 2026-10-30. The regular set of Ricci limit spaces. https://arxiv.org/abs/2610.41449

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