DING Huihui, LIU Lihan. Transmission eigenvalue problem of internal inverse scattering for fully coated media[J/OL]. Acta Scientiarum Naturalium Universitatis Sunyatseni, 2026, 1-10.
DOI:
DING Huihui, LIU Lihan. Transmission eigenvalue problem of internal inverse scattering for fully coated media[J/OL]. Acta Scientiarum Naturalium Universitatis Sunyatseni, 2026, 1-10. DOI: 10.11714/acta.snus.ZR20250105.
Transmission eigenvalue problem of internal inverse scattering for fully coated media
Transmission eigenvalue problem of internal inverse scattering in inhomogeneous media with fully coated boundary conditions is investigated. First,a fourth-order nonlinear transmission eigenvalue problem is established. Second, an equivalent mixed formulation with auxiliary variables is proposed to transform the nonlinear problem into a linear eigenvalue problem. Appropriate operators are constructed using the Riesz representation theorem and the Rellich compactness theorem. Then, the compactness and coerciveness of operators are proven through the Brezzi theory, Cauchy convergence criterion, and Poincaré inequality. Subsequently, finite element discretization is performed. It is demonstrated that optimal convergence rates for transmission eigenvalues can be achieved on both convex and non-convex domains. A sparse generalized eigenvalue problem is derived, which significantly reduces matrix size by compressing nearly all ∞ eigenvalues with huge multiplicities while preserving sparsity.
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