RCD homeomorphism conjecture for singular Kähler varieties

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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 X∘X^\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.

References

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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