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entre a densidade de massa dos ´axions e a densidade cr´ ıtica para Universo plano ´ e dada por: ax = ρ ax ρ cr´ ıtico = 6 μ eV m ax 7 6 200MeV λ QCD 3 4 75km / (s · Mpc) H 0 2 a massa do ´axion precisa ser maior do que 1 μ eV ou ter´ ıamos Ω ax 1. O segundo fator vem do fato da massa do ´axion surgir para temperatura kT = λ QCD . No modelo de Kim, a massa do ´axion ´ e proporcional `a massa do quark 406
Figura 23.25: Previs˜oes das propriedades dos ´axions conforme Jihn E. Kim (1998, Physical Review D, 58, 55006), juntamente com os limites observados pelos experimentos de cavidade (decaimento por campo magn´ etico).

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