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Charges and Generators of Symmetry Transformations in Quantum Field Theory

CLAUDIO A. ORZALESI*

CLAUDIO A. ORZALESI*

  • Department of Physics, Columbia University, New York, New York

  • *Present address: Department of Physics, New York University, New York, N.Y. 10012.
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Rev. Mod. Phys. 42, 381 – Published 1 October, 1970

DOI: https://doi.org/10.1103/RevModPhys.42.381

Abstract

Within the Wightman approach to quantum field theory, we review and clarify the properties of formal charges, defined as space integrals for the fourth component of a local current. The conditions for a formal charge to determine an operator (generator) are discussed, in connection with the well-known theorems of Goldstone and of Coleman. The symmetry transformations generated by this operator—given its existence—are also studied in some detail. For generators in a scattering theory, we prove their additivity and thus provide a simple way to characterize them from their matrix elements between one-particle states. This characterization allows an immediate construction of the unitary operators implementing the symmetry transformations, and implies that all internal symmetry groups are necessarily compact. We also indicate how to construct interacting fields having definite internal quantum numbers. The present status of the proof of Noether's theorem and of its converse is discussed in the light of the rather delicate properties of formal charges.

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Rev. Mod. Phys. 42, 381– Published 1 October, 1970

    © 1970 American Physical Society

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