Fractional differentiability for solutions of the inhomogenous $p$-Laplace system

TL;DR

This paper proves that solutions to the inhomogeneous p-Laplace system with p ≥ 3 have gradients with fractional differentiability properties, extending known regularity results and improving previous estimates.

Contribution

It introduces a new fractional differentiability result for solutions of the inhomogeneous p-Laplace system, extending regularity theory for p-harmonic functions.

Findings

Gradients lie in fractional Nikol'skii spaces with specific parameters.

Improves known regularity estimates for p-harmonic functions.

Extends regularity methods to the case p ≥ 3.

Abstract

It is shown that if $p \ge 3$ and $u \in W^{1,p}(\Omega,\mathbb{R}^N)$ solves the inhomogenous $p$-Laplace system \[ \operatorname{div} (|\nabla u|^{p-2} \nabla u) = f, \qquad f \in W^{1,p'}(\Omega,\mathbb{R}^N), \] then locally the gradient $\nabla u$ lies in the fractional Nikol'skii space $\mathcal{N}^{\theta,2/\theta}$ with any $\theta \in [ \tfrac{2}{p}, \tfrac{2}{p-1} )$. To the author's knowledge, this result is new even in the case of $p$-harmonic functions, slightly improving known $\mathcal{N}^{2/p,p}$ estimates. The method used here is an extension of the one used by A. Cellina in the case $2 \le p < 3$ to show $W^{1,2}$ regularity.