Small CP or Peccei-Quinn breaking shifts the axion vacuum and creates scalar forces, while a Pati-Salam flavor model yields an accidental high-quality PQ symmetry with axion mass above roughly 0.01 eV.
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Imperfect Axions
Small CP or Peccei-Quinn breaking shifts the axion vacuum and creates scalar forces, while a Pati-Salam flavor model yields an accidental high-quality PQ symmetry with axion mass above roughly 0.01 eV.