Phys. Rev. Lett. 37, 172–175 (1976)Vacuum Periodicity in a Yang-Mills Quantum TheoryReceived 1 June 1976; published in the issue dated 19 July 1976 We propose a description of the vacuum in Yang-Mills theory and arrive at a physical interpretation of the pseudoparticle solution and the attendant violation of symmetries. The existence of topologically inequivalent classical gauge fields gives rise to a family of quantum mechanical vacua, parametrized by a CP-nonconserving angle. The requirement of vacuum stability against gauge transformations renders the vacua chirally noninvariant. © 1976 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.37.172
DOI:
10.1103/PhysRevLett.37.172
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