Fourier Method for Approximating Eigenvalues of Indefinite Stekloff Operator

  • Yangqingxiang Wu
  • Ludmil ZikatanovEmail author
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 11087)


We introduce an efficient method for computing the Stekloff eigenvalues associated with the indefinite Helmholtz equation. In general, this eigenvalue problem requires solving the Helmholtz equation with Dirichlet and/or Neumann boundary condition repeatedly. We propose solving the discretized problem with Fast Fourier Transform (FFT) based on carefully designed extensions and restrictions operators. The proposed Fourier method, combined with proper eigensolver, results in an efficient and easy approach for computing the Stekloff eigenvalues.


Stekloff eigenvalues FFT Helmholtz equation 


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© Springer International Publishing AG, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of MathematicsThe Pennsylvania State UniversityUniversity ParkUSA

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