Original scientific paper

A note on gauge invariance in perturbation theory

Andrea Raspini ; Department of Physics, SUNY at Fredonia, Fredonia, NY14063, USA

Abstract

This paper discusses gauge invariance issues in semiclassical perturbation theory, outlining a nonrelativistic single-particle treatment which guarantees perturbative gauge invariance in a relative sense (that is, in relationship to a chosen ``reference'' gauge of the electromagnetic four-potential). The selection of the reference gauge depends on the intended physical meanings of the calculated quantities, but it appears that the transverse gauge is the most appropriate choice. Generalizations to multiparticle systems and relativistic particles are possible.

Keywords

perturbative gauge invariance; semiclassical perturbation theory; nonrelativistic single-particle treatment

Hrčak ID:

304079

URI

https://hrcak.srce.hr/304079

Publication date:

1.10.2002.

Article data in other languages: croatian

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