Uniform delta-plt blowup conjecture for klt singularities

Let nn be a positive integer and let ε>0\varepsilon>0. A δ\delta-plt blowup of a klt singularity xXx\in X is a plt blowup YXY\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 xXx\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.

Sources & referencesView supporting material

Primary source

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

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