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arXiv · 2608.31043

Sharp constants for weak estimates of the Riesz Potentials

Hanli Tang·Yaojun Wang
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Abstract

In this paper we prove the sharp weak estimates for the Riesz potentials $$\|I_{s}(f)\|_{L^{\frac{n}{n-s},\infty}}\leq γ_{n,s} v_n^{\frac{n-s}{n}}\frac{Γ(s/2)Γ((n+2-s)/2)}{Γ(n/2)}\|f\|_{L^1},~~ \text{when}~~0<s<\min\{n,2\}$$ and $$ \|I_sf\|_{L^{\frac{n}{n-s},\infty}} \leq γ_{n,s}v_n^{\frac{n-s}{n}}\|f\|_{L^1}, ~~\text{when}~~2\leq s<n,$$ where $γ_{n,s}=2^{-s}π^{-\frac{n}{2}}\frac{Γ(\frac{n-s}{2})}{Γ(\frac{s}{2})}$ and $v_n$ is the volume of the unit ball. The isoperimetric inequality for the Riesz capacity and the Newtonian isocapacitary inequality play a crucial role in our approach.

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Hanli Tang, Yaojun Wang. 2026-09-07. Sharp constants for weak estimates of the Riesz Potentials. https://arxiv.org/abs/2608.31043

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