Thermal production of not so invisible axions in the early universe

Physics

Scientific paper

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Big Bang Cosmology, Decay, Elementary Particles, Luminosity, Universe, Mass, Photons, Symmetry

Scientific paper

We find that for Peccei-Quinn symmetry-breaking scales less than or equal to 2 x 10 to the 8th power GeV (corresponding to axion masses greater than or equal to 3 x 10 to the -2 eV) thermal production of axions in the early Universe (via the Primakoff and photoproduction processes) dominates coherent production by a factor of about 1200 (ma/eV)2.175. The photon luminosity from the decays of these relic axions leads to a model-independent upper limit to the axion mass of order 2 to 5 eV. If the axion mass saturates this bound, relic axion decays may well be detectable.

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