Strong CP Problem ·
θ̄ the vacuum angle
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.com · QCD θ̄ · neutron EDM · the axion fix
θ̄ dial
—
bound
|θ̄| ≲ 10⁻¹⁰
phase
—
θ̄ dial (0 → 2π)
Neutron + EDM
Measured bound
Axion potential
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