Weyl-Titchmarsh functions of vector-valued Sturm-Liouville operators on the unit interval

Chelkak, Dmitry; Korotyaev, Evgeny

Weyl-Titchmarsh functions of vector-valued Sturm-Liouville operators on the unit interval

Authors

Description

The matrix-valued Weyl-Titchmarsh functions $M(λ)$ of vector-valued Sturm-Liouville operators on the unit interval with the Dirichlet boundary conditions are considered. The collection of the eigenvalues (i.e., poles of $M(λ)$) and the residues of $M(λ)$ is called the spectral data of the operator. The complete characterization of spectral data (or, equivalently, $N\times N$ Weyl-Titchmarsh functions) corresponding to $N\times N$ self-adjoint square-integrable matrix-valued potentials is given, if all $N$ eigenvalues of the averaged potential are distinct.
34 pages; typos corrected