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Open Access Publications from the University of California

QCD Axion Dark Matter with a Small Decay Constant.

  • Author(s): Co, Raymond T
  • Hall, Lawrence J
  • Harigaya, Keisuke
  • et al.

The QCD axion is a good dark matter candidate. The observed dark matter abundance can arise from misalignment or defect mechanisms, which generically require an axion decay constant f_{a}∼O(10^{11})  GeV (or higher). We introduce a new cosmological origin for axion dark matter, parametric resonance from oscillations of the Peccei-Quinn symmetry breaking field, that requires f_{a}∼(10^{8}-10^{11})  GeV. The axions may be warm enough to give deviations from cold dark matter in large scale structure.

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