Early-universe thermal production of not-so-invisible axions

Details Early-universe thermal production of not-so-invisible axions Early-universe thermal production of not-so-invisible axions

Nov 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987phrvl..59.2489t&link_type=abstract

Physical Review Letters (ISSN 0031-9007), vol. 59, Nov. 23, 1987, p. 2489-2492. Research supported by the Alfred P. Sloan Founda

Physics

56

Broken Symmetry, Galactic Evolution, Particle Production, Quantum Chromodynamics, Red Shift, Temperature Effects, Halos, Thermodynamic Equilibrium

Scientific paper

It is found that, for Peccei-Quinn symmetry-breaking scales of less than about 4 x 10 to the 8th GeV (corresponding to axion masses of greater than about 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/ma/(1 eV)/ exp 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.

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