%0 Journal Article
%T Internal Time Superoperator for Quantum Systems with Diagonal Singularity
%A Roberto Laura
%A Adolfo R. Ordoniez
%J Physics
%D 1999
%I arXiv
%X We generalize the concepts of Internal Time Superoperator, its associated non unitary similarity transformations and Liapounov variables, to quantum systems with diagonal singularity, and we give a constructive proof of the existence of these superoperators for systems with purely diagonal Hamiltonian having uniform absolutely continuous spectrum on the interval from zero to infinity.
%U http://arxiv.org/abs/quant-ph/9903090v1