Axion Dark Matter · QCD's fix, the cosmos's filling
unseel.com · Peccei-Quinn 1977 · μeV scalar field · ma fa ≈ mπ fπ
|θ̄| ≲ 10⁻¹⁰
fa ~ 10⁹–10¹² GeV
phase
Axion field a(x)
Photon γ (Primakoff)
QCD vacuum / θ-needle
Kerr horizon / supernova
Unseel.com · Axion Dark Matter