Finite rank perturbations, scattering matrices and inverse problems
- Behrndt, Jussi
- Malamud, Mark M.
- Neidhardt, Hagen
2010 Mathematics Subject Classification
- 47A40 81U40 47A55 47B44
- Scattering system, scattering matrix, boundary triplet, Weyl function, dissipative operator, Lax-Phillips scattering
In this paper the scattering matrix of a scattering system consisting of two selfadjoint operators with finite dimensional resolvent difference is expressed in terms of a matrix Nevanlinna function. The problem is embedded into an extension theoretic framework and the theory of boundary triplets and associated Weyl functions for (in general nondensely defined) symmetric operators is applied. The representation results are extended to dissipative scattering systems and an explicit solution of an inverse scattering problem for the Lax-Phillips scattering matrix is presented.
- Operator Theory in Krein Spaces and Spectral Analysis, J. Behrndt, K.-H. Förster, C. Trunk, H. Winkler, eds., vol. 198 of Operator Theory: Advances and Applications, Birkhäuser, Basel, 2009, pp. 61--85