RCD topological stability conjecture under noncollapsed three-dimensional convergence

Let (Xi,di,H3)(X_i,\mathsf{d}_i,\mathscr{H}^3) be RCD(2,3)\operatorname{RCD}(-2,3) spaces. Assume that

(Xi,di)GH(X,d)as i,(X_i,\mathsf{d}_i)\xrightarrow{\mathrm{GH}}(X,\mathsf{d})\, \quad \text{as $i\to\infty$}\,,

without collapse, for some compact RCD(2,3)\operatorname{RCD}(-2,3) space (X,d,H3)(X,\mathsf{d},\mathscr{H}^3).

RCD stability conjecture. There exists i0Ni_0\in\mathbb{N} such that XiX_i is homeomorphic to XX for every ii0i\ge i_0.

This would remove the manifold assumption from the three-dimensional stability theorem. The source presents it as a consequence that would follow if Mondino's orbifold conjecture held, and does not specify a resolution.

Sources & referencesView supporting material

Primary source

Daniele Semola, “The large scale structure of complete 4-manifolds with nonnegative Ricci curvature and Euclidean volume growth”, arXiv:2501.07125 (2025).

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