Abstract
We study the discrete spectrum of the Laplace operator with the Dirichlet boundary conditions in a plane waveguide made of a band of unit width and half-band of width h perpendicular to it. The existence of critical width h * ∈ (1,2] is established: in the case of h ∈ (0, h*), the discrete spectrum σ h d of the problem contains only one eigenvalur λ h1 , but σ h d = ⊘ at h ≥ h *. The asymptotics of the eigenvalue λ h1 at h → + 0 is found.
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Original Russian Text © S.A. Nazarov, 2010, published in Akusticheskiĭ Zhurnal, 2010, Vol. 56, No. 6, pp. 747–758.
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Nazarov, S.A. Trapped modes in a T-shaped waveguide. Acoust. Phys. 56, 1004–1015 (2010). https://doi.org/10.1134/S1063771010060254
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DOI: https://doi.org/10.1134/S1063771010060254