Convergence of Schrödinger operators on domains with scaled resonant potentials

Abstract: We consider Schr\"odinger operators on a bounded, smooth domain of dimension $d \ge 2$ with Dirichlet boundary conditions and a properly scaled potential, which depends only on the distance to the boundary of the domain. Our aim is to analyse the convergence of these operators as the scaling parameter tends to zero. If the scaled potential is resonant, the limit in strong resolvent sense is a Robin Laplacian with boundary coefficient expressed in terms of the mean curvature of the boundary. A counterexample shows that norm resolvent convergence cannot hold in general in this setting. If the scaled potential is non-negative (hence non-resonant), the limit in strong resolvent sense is the Dirichlet Laplacian. We conjecture that we can drop the non-negativity assumption in the non-resonant case.