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In the framework where the strong coupling is dynamical, the QCD sector mayconfine at a much higher temperature than it would in the Standard Model, andthe 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 axionfield may undergo multiple distinct phases of damping and oscillation leadinggenerically to a suppression of its relic abundance. Such a suppression couldtherefore open up a wide range of parameter space, resurrecting in particularaxion dark-matter models with a large Peccei-Quinn scale $f_a\gg10^{12}~\mathrm{GeV}$, i.e., with a lighter mass than the standard QCD axion.

Resurrecting Low-Mass Axion Dark Matter Via a Dynamical QCD Scale