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  • Access by Xinjiang University

Covariance problem in two-dimensional quantum chromodynamics

C. R. Hagen

  • Department of Physics and Astronomy, University of Rochester, Rochester, New York 14627

Phys. Rev. D 20, 2006 – Published 15 October, 1979

DOI: https://doi.org/10.1103/PhysRevD.20.2006

Abstract

The problem of covariance in the field theory of a two-dimensional non-Abelian gauge field is considered. Since earlier work has shown that covariance fails (in charged sectors) for the Schwinger model, particular attention is given to an evaluation of the role played by the non-Abelian nature of the fields. In contrast to all earlier attempts at this problem, it is found that the potential covariance-breaking terms are identical to those found in the Abelian theory provided that one expresses them in terms of the total (i.e., conserved) current operator. The question of covariance is thus seen to reduce in all cases to a determination as to whether there exists a conserved global charge in the theory. Since the charge operator in the Schwinger model is conserved only in neutral sectors, one is thereby led to infer a probable failure of covariance in the non-Abelian theory, but one which is identical to that found for the U(1) case.

References (10)

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  8. Omitted endnote

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