$L^p$ continuity of eigenprojections for 2-d Dirichlet Laplacians under perturbations of the domain
Ryan L. Acosta Babb, James C. Robinson · arXiv (Cornell University) · 2024
We generalise results by Lamberti and Lanza de Cristoforis (2005) concerning the continuity of projections onto eigenspaces of self-adjoint differential operators with compact inverses as the (spatial) domain of the functions is perturbed in $\mathbb{R}^2$. Our main case of interest is the Dirichlet Laplacian. We extend these results from bounds from $H_0^1$ to $H_0^1$ to bounds from $L^p$ to $L^p$, under the assumption that $(-Δ^{-1}-z)^{-1}$ is $L^p$ bounded when $z$ lies outside of the spectrum of $-Δ^{-1}$. We show that this assumption is met if the initial domain is a square or a rectangle.