Ekström–Persson conjecture on dimensions of random limsup sets

Let u u be a probability measure on Rd\mathbb{R}^d, let (ωk)k=1(\omega_k)_{k=1}^{\infty} be independent random points distributed according to ν\nu, and for α>0\alpha>0 define

Eα(ω):=lim supkB(ωk,kα).E_{\alpha}(\omega):=\limsup_{k\to\infty}B(\omega_k,k^{-\alpha}).

Write fν(α)f_\nu(\alpha) for the almost sure value of dimHEα(ω)\operatorname{dim}_{\mathrm{H}}E_\alpha(\omega). If FνF_\nu is the lower multifractal spectrum of ν\nu and Fν\overline{F}_\nu is its increasing 11-Lipschitz hull, then Ekström–Persson conjecture. For every α>0\alpha>0,

fν(α)=Fν(1α).f_\nu(\alpha)=\overline{F}_\nu\left(\frac{1}{\alpha}\right).

The conjecture predicts that the Hausdorff dimension of the random limsup set is determined by the lower multifractal spectrum of the sampling measure. It was stated for general probability measures on Rd\mathbb{R}^d; the supplied source does not establish its resolution.

Sources & referencesView supporting material

Primary source

Esa Järvenpää, Markus Myllyoja and Stéphane Seuret, “Hitting Probabilities and the Ekström-Persson conjecture”, arXiv:2506.10448 (2025).

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