A strongly perturbed quantum system is a semiclassical system
Abstract
We show that a strongly perturbed quantum system, being a semiclassical system characterized by the WignerKirkwood expansion for the propagator, has the same expansion for the eigenvalues as for the WKB series. The perturbation series is rederived by the duality principle in perturbation theory.
 Publication:

Proceedings of the Royal Society of London Series A
 Pub Date:
 September 2007
 DOI:
 10.1098/rspa.2007.1879
 arXiv:
 arXiv:hepth/0603182
 Bibcode:
 2007RSPSA.463.2195F
 Keywords:

 High Energy Physics  Theory;
 Mathematical Physics;
 Quantum Physics
 EPrint:
 4 pages, no figures. Accepted for publication in Proceedings of the Royal Society A