Origin of dark matter axions.

Details Origin of dark matter axions. Origin of dark matter axions.

Dec 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998phr...307..227s&link_type=abstract

Physics Reports, Vol. 307, No. 1 - 4, p. 227 - 234

Physics

8

Dark Matter: Early Universe

Scientific paper

The authors discuss the possible sources of dark matter axions in the early universe. In the standard thermal scenario, an axion string network forms at the Peccei-Quinn phase transition T ≡ fa and then radiatively decays into a cosmological background of axions; to be the dark matter, these axions must have a mass ma ≡ 100 μeV with specified large uncertainties. An inflationary phase with a reheat temperature below the PQ-scale Treh ⪉ fa can also produce axion strings through quantum fluctuations, provided that the Hubble parameter during inflation is large H1 ⪆ fa; this case again implies a dark matter axion mass ma ≡ 100 μeV. For a smaller Hubble parameter during inflation H1 ⪉ fa, 'anthropic tuning' allows dark matter axions to have any mass in a huge range below ma ⪉ 1 meV.

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