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Resurrecting Low-Mass Axion Dark Matter Via a Dynamical QCD Scale
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abstract
In the framework where the strong coupling is dynamical, the QCD sector may confine at a much higher temperature than it would in the Standard Model, and the temperature-dependent mass of the QCD axion evolves in a non-trivial way. We find that, depending on the evolution of $\Lambda_{\mathrm{QCD}}$, the axion field may undergo multiple distinct phases of damping and oscillation leading generically to a suppression of its relic abundance. Such a suppression could therefore open up a wide range of parameter space, resurrecting in particular axion dark-matter models with a large Peccei-Quinn scale $f_a\gg 10^{12}~\mathrm{GeV}$, i.e., with a lighter mass than the standard QCD axion.
Forward citations
Cited by 3 Pith papers
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Axions on a Hyperbolic Ride: Geometric Suppression of CMB Isocurvature and a Blue-Tilted Spectrum
A hyperbolic PQ field-space metric exponentially suppresses CMB axion isocurvature and induces a blue-tilted spectrum, allowing H_inf≈10^13 GeV with fa up to 10^16 GeV.
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Thermal History of Non-equilibrated Scalars
A non-equilibrated scalar controlling a quartic coupling makes the coupling smaller at high temperature, strengthening the first-order dark Higgs phase transition.
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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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