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QCD Axion Dark Matter from a Late Time Phase Transition
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abstract
We investigate the possibility that the Peccei-Quinn phase transition occurs at a temperature far below the symmetry breaking scale. Low phase transition temperatures are typical in supersymmetric theories, where symmetry breaking fields have small masses. We find that QCD axions are abundantly produced just after the phase transition. The observed dark matter abundance is reproduced even if the decay constant is much lower than $10^{11}$ GeV. The produced axions tend to be warm. For some range of the decay constant, the effect of the predicted warmness on structure formation can be confirmed by future observations of 21 cm lines. A portion of parameter space requires a mixing between the Peccei-Quinn symmetry breaking field and the Standard Model Higgs, and predicts an observable rate of rare Kaon decays.
Forward citations
Cited by 3 Pith papers
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Dark Matter and Baryon Asymmetry from Monopole-Axion Interactions
A rotating QCD axion dissipates kinetic energy via dark monopole dyon transitions, explaining dark matter and baryon asymmetry with a predicted axion decay constant below 10^9 GeV.
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Impact of First-order Electroweak Phase Transition on QCD Axion
A temporary axion mass spike during a first-order electroweak phase transition can make the QCD axion dark matter over a wide range of decay constants without a tuned initial angle.
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Universal lower bound on the axion decay constant from free streaming effects
Abundance-boosted axion dark matter generically produces warm nonzero-momentum modes, so Lyman-alpha free-streaming and isocurvature bounds exclude fa below about 10^14-10^15 GeV (10^-18 eV/ma) for most ultralight axi...
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