RCD homeomorphism conjecture for singular Kähler varieties

Let XX be a normal Kähler variety with klt singularities. Let ω\omega be a Kähler current whose volume measure has an LpL^p density for some p>1p>1, whose Ricci current is bounded below by ω-\omega, and which is smooth on a Zariski open subset XX^\circ of XX. Consider the metric measure space (X,ω,ωn)(X^\circ,\omega,\omega^n).

RCD homeomorphism conjecture. The metric completion of (X,ω,ωn)(X^\circ,\omega,\omega^n) is a non-collapsed RCD space homeomorphic to XX.

This conjecture would connect Kähler geometry on singular varieties with the topology and metric structure of RCD spaces. The source introduces it as a main question in the developing theory, with no resolution stated.

Sources & referencesView supporting material

Primary source

Xin Fu, Bin Guo, Jian Song and Juanyong Wang, “Fundamental groups of compact Kahler varieties with nef anti canonical bundle”, arXiv:2602.07420 (2026).

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