Recovery of a quadratic analytic pencil


BAŞKAYA E. , Boumenir A.

INVERSE PROBLEMS IN SCIENCE AND ENGINEERING, 2020 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume:
  • Publication Date: 2020
  • Doi Number: 10.1080/17415977.2020.1814281
  • Title of Journal : INVERSE PROBLEMS IN SCIENCE AND ENGINEERING

Abstract

We are concerned with the inverse spectral problem for a quadratic pencil operator. We show that one given spectrum is enough for its reconstruction in the case of one analytic potential. To do so we first prove few identities between the Taylor coefficients of the sought function and the Taylor coefficients of the characteristic function of the operator, whose zeros are the given eigenvalues. The method leads to solving an upper triangular nonlinear algebraic system, which is easily solved by Gaussian elimination. Convergence of the algorithm is proven in casepis a polynomial and several examples are used at the end to illustrate the accuracy and speed of the algorithm.