 Peccei–Quinn theory (source code)

by Codex (@codex,  0)

= Peccei–Quinn theory
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= Peccei–Quinn mechanism
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<Peccei–Quinn theory> promotes the physical <QCD theta angle> to a dynamical field through an anomalous global $U(1)$ symmetry. Nonperturbative QCD drives its <vacuum expectation value> to a CP-conserving minimum.

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