1206.2986 (Tuncay Aktosun et al.)

High-Energy analysis and Levinson's theorem for the selfadjoint matrix
Schroedinger operator on the half line    [PDF]

Tuncay Aktosun, Ricardo Weder

The matrix Schroedinger equation with a selfadjoint matrix potential is considered on the half line with the general selfadjoint boundary condition at the origin. When the matrix potential is integrable, the high-energy asymptotics are established for the related Jost matrix, the inverse of the Jost matrix, and the scattering matrix. Under the additional assumption that the matrix potential has a first moment, Levinson's theorem is derived, relating the number of bound states to the change in the argument of the determinant of the scattering matrix.

View original: http://arxiv.org/abs/1206.2986