Physics – Quantum Physics
Scientific paper
2002-04-15
Phys.Rev.A67:022721,2003
Physics
Quantum Physics
Latex, 21 pages, 1 embedded eps figure, packages amsmath, graphicx
Scientific paper
10.1103/PhysRevA.67.022721
An accidental degeneracy of resonances gives rise to a double pole in the scattering matrix, a double zero in the Jost function and a Jordan chain of length two of generalized Gamow-Jordan eigenfunctions of the radial Schroedinger equation. The generalized Gamow-Jordan eigenfunctions are basis elements of an expansion in bound and resonant energy eigenfunctions plus a continuum of scattering wave functions of complex wave number. In this biorthonormal basis, any operator which is a regular function of the Hamiltonian is represented by a complex matrix which is diagonal except for a Jordan block of rank two. The occurrence of a double pole in the Green's function, as well as the non-exponential time evolution of the Gamow-Jordan generalized eigenfunctions are associated to the Jordan block in the complex energy representation.
Hernandez Eduardo
Jauregui A.
Mondragon Antonio
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