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Spectrum of the Laplacian in a narrow curved strip with combined Dirichlet and Neumann boundary conditions. (English) Zbl 1173.35618
Summary: We consider the Laplacian in a domain squeezed between two parallel curves in the plane, subject to Dirichlet boundary conditions on one of the curves and Neumann boundary conditions on the other. We derive two-term asymptotics for eigenvalues in the limit when the distance between the curves tends to zero. The asymptotics are uniform and local in the sense that the coefficients depend only on the extremal points where the ratio of the curvature radii of the Neumann boundary to the Dirichlet one is the biggest. We also show that the asymptotics can be obtained from a form of norm-resolvent convergence which takes into account the width-dependence of the domain of definition of the operators involved.

MSC:
35P15 Estimates of eigenvalues in context of PDEs
49R50 Variational methods for eigenvalues of operators (MSC2000)
58J50 Spectral problems; spectral geometry; scattering theory on manifolds
81Q15 Perturbation theories for operators and differential equations in quantum theory
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