2000 character limit reached
QCD Axion Dark Matter with a Small Decay Constant (1711.10486v2)
Published 28 Nov 2017 in hep-ph and astro-ph.CO
Abstract: 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 $f_a \sim \mathcal{O}(10{11})$ 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 $f_a \sim (108 -10{11})$ GeV. The axions may be warm enough to give deviations from cold dark matter in Large Scale Structure.
Collections
Sign up for free to add this paper to one or more collections.
Paper Prompts
Sign up for free to create and run prompts on this paper using GPT-5.
