Abstract
The transmission eigenvalue problem arises in scattering theory. The main difficulty in its analysis is the fact that, depending on the chosen formulation, it leads either to a quadratic eigenvalue problem or to a non-classical mixed problem. In this paper we prove the convergence of a mixed finite element approximation. This approach, which is close to the Ciarlet–Raviart discretization of biharmonic problems, is based on Lagrange finite elements and is one of the less expensive methods in terms of the amount of degrees of freedom. The convergence analysis is based on classical abstract spectral approximation result and the theory of mixed finite element methods for solving the stream function–vorticity formulation of the Stokes problem. Numerical experiments are reported in order to assess the efficiency of the method.
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This research was partially supported by Projects Fondecyt 1180859 and 11160186 and by Basal Project, CMM, Universidad de Chile.
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Camaño, J., Rodríguez, R. & Venegas, P. Convergence of a lowest-order finite element method for the transmission eigenvalue problem. Calcolo 55, 33 (2018). https://doi.org/10.1007/s10092-018-0276-1
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DOI: https://doi.org/10.1007/s10092-018-0276-1