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- W4306176145 abstract "We compute low energy asymptotics for the resolvent of a planar obstacle, and deduce asymptotics for the corresponding scattering matrix, scattering phase, and exterior Dirichlet-to-Neumann operator. We use an identity of Vodev to relate the obstacle resolvent to the free resolvent and an identity of Petkov and Zworski to relate the scattering matrix to the resolvent. The leading singularities are given in terms of the obstacle's logarithmic capacity or Robin constant. We expect these results to hold for more general compactly supported perturbations of the Laplacian on $mathbb R^2$, with the definition of the Robin constant suitably modified, under a generic assumption that the spectrum is regular at zero." @default.
- W4306176145 created "2022-10-14" @default.
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- W4306176145 date "2022-10-11" @default.
- W4306176145 modified "2023-09-27" @default.
- W4306176145 title "Low energy scattering asymptotics for planar obstacles" @default.
- W4306176145 doi "https://doi.org/10.2140/paa.2023.5.767" @default.
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