TL;DR
This paper summarizes the concept of superselection rules in quantum mechanics and quantum field theory, clarifying their meaning and implications within these frameworks.
Contribution
It provides a concise overview and clarification of superselection rules, extending previous explanations in the context of quantum physics.
Findings
Clarifies the meaning of superselection rules
Explains their role in quantum mechanics and quantum field theory
Provides an extended summary for educational purposes
Abstract
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.
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