The stiff Neumann problem: asymptotic specialty and "kissing" domains

V. Chiadò Piat, L. D'Elia, S. A. Nazarov

We study the stiff spectral Neumann problem for the Laplace operator in a smooth bounded domain $\Omega \subset {\mathbb{R}}^d$ which is divided into two subdomains: an annulus ${\Omega }_1$ and a…