# Fractional Integration and Optimal Estimates for Elliptic Systems

created by spector on 14 Aug 2020

[BibTeX]

preprint

Inserted: 14 aug 2020
Last Updated: 14 aug 2020

Year: 2020

ArXiv: 2008.05639 PDF

Abstract:

In this paper we prove the following optimal Lorentz embedding for the Riesz potentials: Let $\alpha \in (0,d)$. There exists 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 $\operatorname*{div} F=0$ in the sense of distributions. We then show how this result implies optimal Lorentz regularity for a Div-Curl system (which can be applied, for example, to obtain new estimates for the magnetic field in Maxwell's equations), as well as for a vector-valued Poisson equation in the divergence free case.

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