Cheeger--Colding volume-ratio conjecture for collapsed Ricci limit spaces

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Let (X,d)(X,\mathsf{d}) be the metric limit under consideration, let k=dim⁡H(X,d)k=\dim_{\mathcal{H}}(X,\mathsf{d}), and let Hk\mathcal{H}^k denote its kk-dimensional Hausdorff measure. For m∈[k,n]∩Nm\in[k,n]\cap\mathbb{N}, let Volm(r)\mathrm{Vol}_m(r) be the volume of a radius-rr ball in the mm-dimensional space form of sectional curvature −1-1. Cheeger--Colding conjecture. There exists m∈[k,n]∩Nm\in[k,n]\cap\mathbb{N} such that, for every y∈Xy\in X,

Hk(Br(y))Volm(r)↓(r↑∞).\frac{\mathcal{H}^k(B_r(y))}{\mathrm{Vol}_m(r)}\downarrow\qquad(r\uparrow\infty).

This is presented as a conjecture raised by Cheeger and Colding concerning asymptotic volume ratios; the source gives no resolution.

References

Primary source

Shouhei Honda, “Collapsed Ricci limit spaces as non-collapsed RCD spaces”, arXiv:2002.08612 (2020).

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