Thermal production of not so invisible axions in the early universe

Details Thermal production of not so invisible axions in the early universe Thermal production of not so invisible axions in the early universe

Oct 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986stin...8720866t&link_type=abstract

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Physics

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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