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The QCD Axion: Some Like It Hot

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arxiv 2310.08169 v3 pith:75ARXXBZ submitted 2023-10-12 hep-ph astro-ph.CO

The QCD Axion: Some Like It Hot

classification hep-ph astro-ph.CO
keywords axionboundabundancesacousticbackgroundbaryonicboltzmannchiral
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We compare the QCD axion phase-space distribution from unitarized next-to-leading order chiral perturbation theory with the one extracted from pion-scattering data. We derive a robust bound by confronting momentum-dependent Boltzmann equations against up-to-date observations of the Cosmic Microwave Background, of the Baryonic Acoustic Oscillations and of primordial abundances. These datasets imply $m_{a} \leq \, 0.16 $ eV for the 95% credible interval, i.e. $\sim$30% stronger bound than what previously found. We present forecasts using dedicated likelihoods for future cosmological surveys and the sphaleron rate from unquenched lattice QCD.

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Cited by 3 Pith papers

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    For axion masses above 0.1 eV, cosmology provides the strongest known limits on axion couplings to muons, taus, and flavor-violating tau channels, excluding decay constants up to 10^8 GeV.

  2. Flavor phenomenology of light dark particles

    hep-ph 2026-06 unverdicted novelty 2.0

    Review surveying limits and prospects for flavor-violating decays of light axion-like particles, highlighting complementarity of lab, astro, and cosmo probes up to 10^12 GeV scales.

  3. Axions at the meV Crossroads: Theory, Cosmology, Astrophysics, and Experiments

    hep-ph 2026-03 conditional novelty 2.0

    The meV axion window is presented as a coherent, cross-validated search program in which string theory, stellar cooling, dark matter, and new detector concepts converge on the same mass range.