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Application Of Clenshaw–Curtis Method In Confined Time Of Arrival Operator Eigenvalue Problem

Author

Listed:
  • ROBERTO S. VITANCOL

    (Theoretical Physics Group, National Institute of Physics, University of the Philippines, Diliman Quezon City 1101, Philippines)

  • ERIC A. GALAPON

    (Theoretical Physics Group, National Institute of Physics, University of the Philippines, Diliman Quezon City 1101, Philippines)

Abstract

The Clenshaw–Curtis method in discretizing a Fredholm integral operator is applied to solving the confined time of arrival operator eigenvalue problem. The accuracy of the method is measured against the known analytic solutions for the noninteracting case, and its performance compared against the well-known Nystrom method. It is found that Clenshaw–Curtis's is superior to Nystrom's. In particular, Nystrom method yields at most five correct decimal places for the eigenvalues and eigenfunctions, while Clenshaw–Curtis yields eigenvalues correct to 16 decimal places and eigenfunctions up to 15 decimal places for the same number of quadrature points. Moreover, Clenshaw–Curtis's accuracy in the eigenvalues is uniform over a determinable range of the computed eigenvalues for a given number of quadrature abscissas. Clenshaw–Curtis is then applied to the harmonic oscillator confined time of arrival operator eigenvalue problem.

Suggested Citation

  • Roberto S. Vitancol & Eric A. Galapon, 2008. "Application Of Clenshaw–Curtis Method In Confined Time Of Arrival Operator Eigenvalue Problem," International Journal of Modern Physics C (IJMPC), World Scientific Publishing Co. Pte. Ltd., vol. 19(05), pages 821-844.
    • Handle: RePEc:wsi:ijmpcx:v:19:y:2008:i:05:n:s0129183108012534
    DOI: 10.1142/S0129183108012534
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