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We find that for Peccei-Quinn symmetry-breaking scales 410^8 GeV (corresponding to axion masses 0. 03 eV) thermal production of axions in the early Universe (via the Primakoff and photoproduction processes) dominates coherent production by a factor of about 1200{m₀ (1 eV) }^2. 175. The photon luminosity from the decays of these relic axions leads to an upper limit to the axion mass of order 2-5 eV. If the axion mass saturates this bound, relic axion decays may well be detectable.
Michael S. Turner (Mon,) studied this question.
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