RCD compactness and homeomorphism conjecture for singular Kähler spaces

Let XX be an nn-dimensional projective variety with log terminal singularities, and let θX\theta_X be a smooth Kähler metric on XX. Let (X,ω)RK(n)(X,\omega)\in\mathcal{RK}(n), so that obreakωRK(X) obreak\omega\in\mathcal{RK}(X), and let (X^,dω,μω)(\hat X,d_\omega,\mu_\omega) be the metric measure space induced by (X,ω)(X,\omega) as in Definition. RCD conjecture. For any (X,ω)RK(n)(X,\omega)\in\mathcal{RK}(n), the metric measure space (X^,dω,μω)(\hat X,d_\omega,\mu_\omega) is a compact RCD\operatorname{RCD} space homeomorphic to the projective variety XX itself. The conjecture proposes that the pluripotential-theoretic Ricci lower bound defining RK(X)\mathcal{RK}(X) yields an RCD structure and that the metric completion retains the topology of the underlying projective variety; the statement is presented as a conjecture, with no resolution given here.

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Primary source

Xin Fu, Bin Guo and Jian Song, “RCD structures on singular Kahler spaces of complex dimension three”, arXiv:2503.08865 (2025).

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