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1. Robert McNees (mcnees@mastodon.social)'s status on Friday, 19-May-2023 14:07:43 UTC Robert McNees

   in reply to

   In 1977, Quinn and Peccei proposed a mechanism to explain the lack of CP violation in QCD.

   The parameter θ isn’t static, they reasoned. Rather, it’s a field itself. The dynamics of this field within QCD naturally cause it to settle down to a value of zero.

   Ref: https://link.aps.org/doi/10.1103/PhysRevLett.38.1440