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Improved hot dark matter bound on the QCD axion

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arxiv 2211.03799 v1 pith:SW6DWQQF submitted 2022-11-07 hep-ph astro-ph.CO

Alessio Notari , Fabrizio Rompineve , Giovanni Villadoro This is my paper · ORCID
classification hep-phastro-ph.CO
keywords boundcosmologicalaxionaboveaxion-pionboltzmannbreakdowncalculations
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abstract

We strengthen the cosmological bound on the axion mass, by solving the momentum-dependent Boltzmann equations for axion-pion scatterings and by using a phenomenological production rate derived from pion-pion scattering data, overcoming the breakdown of chiral perturbation theory. Using present cosmological datasets we obtain $m_a\leq 0.24~\text{eV}$. To further improve the bound and exploit the reach of upcoming cosmological surveys, reliable non-perturbative calculations above the QCD crossover are needed.

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Cited by 5 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Prominent enhancement of axion thermalization rate from axion-kaon interactions

    hep-ph 2025-05 conditional novelty 7.0 of 10

    Axion-kaon scattering, previously omitted from axion thermalization calculations, exceeds the axion-pion channel near T=130 MeV and tightens the Planck Delta N_eff bound on f_a by about 30%.

  2. Revisiting the sphaleron and axion production rates in QCD at high temperatures

    hep-lat 2026-04 unverdicted novelty 6.0 of 10

    Lattice simulations give sphaleron rates in hot QCD plasmas and show axion production rates deviate from perturbative predictions at high temperatures.

  3. Improved cosmological constraints on axion-lepton interactions

    hep-ph 2025-11 conditional novelty 6.0 of 10

    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.

  4. Unified study of two-meson and axion-meson production from semileptonic tau decays within resonance chiral framework

    hep-ph 2025-07 conditional novelty 6.0 of 10

    Within a resonance chiral model, hadron resonances boost predicted tau decays into pion/K plus axion by factors of 7.5 and 19.2, with branching ratios and forward-backward asymmetries also predicted.

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

    hep-ph 2026-03 conditional novelty 2.0 of 10

    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.

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