Estimates on the number of scattering poles near the real axis for strictly convex obstacles
Johannes Sjöstrand, Maciej Zworski (1993)
Annales de l'institut Fourier
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For the Dirichlet Laplacian in the exterior of a strictly convex obstacle, we show that the number of scattering poles of modulus in a small angle near the real axis, can be estimated by Const for sufficiently large depending on . Here is the dimension.