Hodge–Betti convergence conjecture for non-collapsed Ricci limit spaces

Let

MinGHXnM_i^n\stackrel{\mathrm{GH}}{\to}X^n

be a non-collapsed sequence of closed Riemannian manifolds with Ric(n1)\mathrm{Ric}\ge -(n-1), converging in the Gromov–Hausdorff sense to a compact Ricci limit space XnX^n. Let bH,1(Xn)b_{H,1}(X^n) denote the dimension of the space of harmonic 11-forms on XnX^n in Gigli's sense. Hodge–Betti convergence conjecture. Then, for all sufficiently large ii,

b1(Min)=bH,1(Xn),b_1(M_i^n)=b_{H,1}(X^n),

and

bH,1(Xn)=b1(Xn).b_{H,1}(X^n)=b_1(X^n).

The conjecture asks whether first Betti numbers and harmonic first-form dimensions behave continuously under these non-collapsed Ricci-limit convergences; the supplied text gives no resolution.

Sources & referencesView supporting material

Primary source

Shouhei Honda and Andrea Mondino, “Gap phenomena under curvature restrictions”, arXiv:2410.04985 (2025).

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