Thermal axion production in the primordial quark-gluon plasma
arXiv:1008.4528 · doi:10.1103/PhysRevD.83.075011
Abstract
We calculate the rate for thermal production of axions via scattering of quarks and gluons in the primordial quark-gluon plasma. To obtain a finite result in a gauge-invariant way that is consistent to leading order in the strong gauge coupling, we use systematic field theoretical methods such as hard thermal loop resummation and the Braaten-Yuan prescription. The thermally produced yield, the decoupling temperature, and the density parameter are computed for axions with a mass below 10 meV. In this regime, with a Peccei-Quinn scale above 6x10^8 GeV, the associated axion population can still be relativistic today and can coexist with the axion cold dark matter condensate.
5 pages, 4 figures; v2: typo in (15) corrected, one reference added; v3: minor changes, references added, matches published version
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