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A Perturbative Approach for the Solution of Sturm-Liouville Problems

Spectral analysis extends the theory of eigenvectors and eigenvalues of a square matrix to a broader theory involving operators. In particular, a branch of spectral analysis is devoted to Sturm-Liouville (SL) problems, which are eigenvalue problems for differential operators. In this study, we propose a numerical method to solve SL problems. This method uses a simple perturbative approach. Starting from an SL problem having differential operator L0 and known eigensystem, the proposed iterative algorithm considers M SL problems having differential operators Lm, m = 1, 2,..., M, such that Lm is a perturbation of Lm−1, and LM is the differential operator of the SL problem that we want to solve. Each step of this algorithm is based on the well-known Jacobi orthogonal component correction method, which acts on the refinement of approximated eigensystems. Moreover, the proposed method depends on the choice of L0 and the representation basis for the eigenfunctions, thus giving rise to different approximation schemes. We show the performance of the proposed method both in the solution of some selected SL problems and the refinement of approximated eigensystems computed by other numerical methods. In these numerical experiments, the perturbative method is compared with a classical approximation technique and the obtained results are strongly promising in terms of accuracy.

Sturm-Liouville Problem, Eigenvalue Problem, Perturbative Approach

Nadaniela Egidi, Josephin Giacomini, Pierluigi Maponi. (2023). A Perturbative Approach for the Solution of Sturm-Liouville Problems. Applied and Computational Mathematics, 12(3), 46-54.

Copyright © 2023 Authors retain the copyright of this article.
This article is an open access article distributed under the Creative Commons Attribution License ( which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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