Jiao's bounded complement conjecture for Calabi–Yau type varieties

Let XX be a dd-dimensional ε\varepsilon-lc Calabi--Yau type variety, and let AA be an ample divisor on XX such that AdvA^d\leq v, where ε,d,v>0\varepsilon,d,v>0.

Jiao's conjecture. There exists a positive integer mm with the following property: there is an effective Q\mathbb{Q}-Weil divisor Δ\Delta on XX such that (X,Δ)(X,\Delta) is klt and

\nm(KX+Δ)0.\nm(K_X+\Delta)\sim 0.

This predicts a uniform Cartier index under the stated boundedness assumption for ε\varepsilon-lc Calabi--Yau type varieties. The source gives no resolution status, so the conjecture remains open.

Sources & referencesView supporting material

Primary source

Donghyeon Kim and Dae-Won Lee, “Minimal model program on the generic fiber of log Calabi-Yau type fibration”, arXiv:2512.02429 (2025).

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