On eigenvalue asymptotics for strong delta-interactions supported by surfaces with boundaries
Let $S\subset\mathbb{R}^3$ be a $C^4$-smooth relatively compact orientable surface with a sufficiently regular boundary. For $β\in\mathbb{R}_+$, let $E_j(β)$ denote the $j$th negative eigenvalue of the operator associated with the quadratic form \[ H^1(\mathbb{R}^3)\ni u\mapsto \iiint_{\mathbb{R}^3} |\nabla u|^2dx -β\iint_S |u|^2dσ, \] where $σ$ is the two-dimensional Hausdorff measure on $S$. We show that for each fixed $j$ one has the asymptotic expansion \[ E_j(β)=-\dfrac{β^2}{4}+μ^D_j+ o(1) \;\text{ as }\; β\to+\infty\,, \] where $μ_j^D$ is the $j$th eigenvalue of the operator $-Δ_S+K-M^2$ on $L^2(S)$, in which $K$ and $M$ are the Gauss and mean curvatures, respectively, and $-Δ_S$ is the Laplace-Beltrami operator with the Dirichlet condition at the boundary of $S$. If, in addition, the boundary of $S$ is $C^2$-smooth, then the remainder estimate can be improved to ${\mathcal O}(β^{-1}\logβ)$.