Analysis of the Feshbach-Schur method for the planewave discretizations of Schrödinger operators
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In this article, we propose a new numerical method and its analysis to solve eigen-value problems for self-adjoint Schrödinger operators, by combining the Feshbach-Schur perturbation theory with planewave discretization. In order to analyze the method, we establish an abstract framework of Feshbach-Schur perturbation theory with minimal regularity assumptions on the potential that is then applied to the setting of the new planewave discretization method. Finally, we present some numerical results that underline the theoretical findings.
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