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Thermal axion production at low temperatures: a smooth treatment of the QCD phase transition

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arxiv 2108.04259 v3 pith:GNQMTPVE submitted 2021-08-09 hep-ph astro-ph.CO

Francesco D'Eramo , Fazlollah Hajkarim , Seokhoon Yun This is my paper · ORCID
classification hep-phastro-ph.CO
keywords axionproductiontemperaturesphasequantifyratethermaltransition
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We study thermal axion production around the confinement scale. At higher temperatures, we extend current calculations to account for the masses of heavy quarks, whereas we quantify production via hadron scattering at lower temperatures. Matching our results between the two opposite regimes provides us with a continuous axion production rate across the QCD phase transition. We employ such a rate to quantify the axion contribution to the effective number of neutrino species.

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Cited by 4 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. 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.

  3. ALP Production from Abelian Gauge Bosons: Beyond Hard Thermal Loops

    hep-ph 2025-02 conditional novelty 6.0 of 10

    ALP production from a hot Abelian plasma is computed with full 1PI-resummed propagators, giving positive rates at all momenta and revealing dominant timelike-timelike photon contributions at very soft ALP momenta.

  4. 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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