Path connectedness of the regular part of non-collapsed RCD spaces

From papers

Let (X,d,HN)(X,\mathsf d,\mathcal{H}^{N}) be a non-collapsed RCD(K,N)\mathsf{RCD}(K,N) space, and let (RN)ε({\mathcal R}_{N})_{\varepsilon} denote its ε\varepsilon-regular set. Then the interior (RN)ε\overset{\circ}{({\mathcal R}_{N})_{\varepsilon}} is path connected for all sufficiently small ε\varepsilon. Path-connectedness conjecture. The set

(RN)ε\overset{\circ}{({\mathcal R}_{N})_{\varepsilon}}

is path connected for all small ε\varepsilon. The authors suspect that the hypothesis HN1(S)=0\mathcal{H}^{N-1}(\mathcal{S})=0 used in the corresponding theorem is unnecessary; this conjecture asserts the resulting statement for every non-collapsed RCD(K,N)\mathsf{RCD}(K,N) space.

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Primary source

Vitali Kapovitch and Andrea Mondino, “On the topology and the boundary of N-dimensional RCD(K,N) spaces”, arXiv:1907.02614 (2020).

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