Uniform delta-plt blowup conjecture for klt singularities

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Let nn be a positive integer and let ε>0\varepsilon>0. A δ\delta-plt blowup of a klt singularity x∈Xx\in X is a plt blowup Y→XY\to X of a Kollár component EE such that (Y,E)(Y,E) is δ\delta-plt, meaning AY,E(F)>δA_{Y,E}(F)>\delta for every prime divisor FF exceptional over YY. Uniform delta-plt blowup conjecture. There exists a constant δ=δ(n,ε)>0\delta=\delta(n,\varepsilon)>0 such that every nn-dimensional klt singularity x∈Xx\in X with

vol^(x,X)≥ε\widehat{\rm vol}(x,X)\geq\varepsilon

admits a δ\delta-plt blowup. The conjecture would provide uniformly controlled special degenerations and is stated as verified up to dimension three, but open in general.

References

Primary source

Ziquan Zhuang, “Stability of klt singularities”, arXiv:2307.10525 (2023).

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