Superselection Rules
Abstract
Description
This note provides a summary of the meaning of the term `Superselection Rule' in Quantum Mechanics and Quantum-Field Theory. It is a slightly extended version of a contribution to the Compendium of Quantum Physics: Concepts, Experiments, History and Philosophy, edited by Friedel Weinert, Klaus Hentschel, Daniel Greenberger, and Brigitte Falkenburg.
10 pages, no figures. Two easy-to-read proofs of statements made in the text are added in the second version, with slight adaptations in notation
10 pages, no figures. Two easy-to-read proofs of statements made in the text are added in the second version, with slight adaptations in notation