Calculus of Variations and Geometric Measure Theory
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D. Spector

An Optimal Sobolev Embedding for $L^1$

created by spector on 21 Jun 2018



Inserted: 21 jun 2018
Last Updated: 21 jun 2018

Year: 2018

ArXiv: 1806.07588 PDF


In this paper we establish an optimal Lorentz space estimate for the Riesz potential acting on curl-free vectors: There is a constant $C=C(\alpha,d)>0$ such that \[ | | I_\alpha F | |_{L^{d/(d-\alpha),1}(\mathbb{R}^d;\mathbb{R}^d)} \leq C | |F| |_{L^1(\mathbb{R}^d;\mathbb{R}^d)} \] for all fields $F \in L^1(\mathbb{R}^d;\mathbb{R}^d)$ such that $\operatorname*{curl} F=0$ in the sense of distributions. This is the best possible estimate on this scale of spaces and completes the picture in the regime $p=1$ of the well-established results for $p>1$.

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