Kabluchko's almost-sure convergence conjecture for critical points

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Let μ\mu be a probability measure on C\mathbb{C}, let X1,X2,…X_1,X_2,\ldots be independent and identically distributed with law μ\mu, and define Pn(z)=∏j=1n(z−Xj)P_n(z)=\prod_{j=1}^n(z-X_j). Let

μn(1)=1n−1∑z∈C:Pn′(z)=0δz\mu_n^{(1)}=\frac{1}{n-1}\sum_{z\in\mathbb{C}:P_n'(z)=0}\delta_z

be the empirical probability measure of the critical points of PnP_n. Kabluchko's conjecture. For any probability measure μ\mu on C\mathbb{C}, the sequence μn(1)\mu_n^{(1)} converges to μ\mu almost surely as no~∞n{\tilde o}\infty.

This strengthens convergence in distribution to almost-sure convergence. The source identifies it as a conjecture stated by Kabluchko at a 2021 workshop and gives no resolution.

References

Primary source

Marcus Michelen and Xuan-Truong Vu, “Zeros of a growing number of derivatives of random polynomials with independent roots”, arXiv:2212.11867 (2022).

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