A quantitative Gidas-Ni-Nirenberg-type result for the $p$-Laplacian via integral identities

TL;DR

This paper establishes the first quantitative stability result for Gidas-Ni-Nirenberg symmetry involving the p-Laplacian using integral identities, extending previous methods and providing new estimates for singular sets and gradient bounds.

Contribution

It introduces a novel integral identity approach to achieve quantitative stability for the p-Laplacian Gidas-Ni-Nirenberg theorem, extending stability results to nonlinear operators.

Findings

First quantitative stability result for p-Laplacian Gidas-Ni-Nirenberg theorem.

Provides explicit bounds for the measure of the singular set.

Establishes uniform gradient bounds for solutions.

Abstract

We prove a quantitative version of a Gidas-Ni-Nirenberg-type symmetry result involving the $p$-Laplacian. Quantitative stability is achieved here via integral identities based on the proof of rigidity established by J. Serra in 2013, which extended to general dimension and the $p$-Laplacian operator an argument proposed by P. L. Lions in dimension $2$ for the classical Laplacian. Stability results for the classical Gidas-Ni-Nirenberg symmetry theorem (involving the classical Laplacian) via the method of moving planes were established by Rosset in 1994 and by Ciraolo, Cozzi, Perugini, Pollastro in 2024. To the authors' knowledge, the present paper provides the first quantitative Gidas-Ni-Nirenberg-type result involving the $p$-Laplacian for $p \neq 2$. Even for the classical Laplacian (i.e., for $p=2$), this is the first time that integral identities are used to achieve stability for a Gidas-Ni-Nirenberg-type result. In passing, we obtain a quantitative estimate for the measure of the singular set and an explicit uniform gradient bound.