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VOLUME 30 (1979) | ISSUE 10 |
PAGE 674
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The structure of the vacuum In gauge theories and cosmology
Linde A.D.
Arguments are presented showing that the ground state in quantum chromodynamics, rather than being a θ vacuum, is characterized by a density matrix, which implies averaging over all permissible values of Θ. The result is that strong CP violation is automatically missing in the theory.
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