Optimal stability of Dirichlet problem for the regional fractional $p$-Laplacian

Abstract

We establish the optimal stability of Dirichlet boundary value problem for the regional (fractional) $p$-Laplacian $(-\Delta)^s_{p,\Omega}$ with $0<s\leq 1$, $\frac{1}{s}<p<\infty$ and $\Omega\subset \mathbb{R}^d$ bounded Lipschitz. More precisely, if $u_s \in W^{s,p}(\Omega)$ satisfies $(-\Delta)^s_{p,\Omega} u_s = f_s$ in $\Omega$ and $u_s = g_s$ on $\partial \Omega$, then under appropriate condition on the date $f_s$ and $g_s$ we show that $\|u_s - u_1\|_{W^{s,p}(\Omega)} \to 0 \quad \text{as } s \to 1^-.$ We also obtain an analogous optimal stability of the normalized Dirichlet eigenpairs $(\lambda_s,\varphi_s)$ associated with $(-\Delta)^s_{p,\Omega}$.