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An improved cosmological bound on the thermal axion mass

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arxiv 0705.2695 v1 pith:J3AGFFXQ submitted 2007-05-18 astro-ph gr-qchep-ph

Alessandro Melchiorri , Olga Mena , Anze Slosar This is my paper · ORCID
classification astro-phgr-qchep-ph
keywords axioncosmologicalmassbounddataimprovedthermalabove
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Relic thermal axions could play the role of an extra hot dark matter component in cosmological structure formation theories. By combining the most recent observational data we improve previous cosmological bounds on the axion mass m_a in the so-called hadronic axion window. We obtain a limit on the axion mass m_a < 0.42eV at the 95% c.l. (m_a < 0.72eV at the 99% c.l.). A novel aspect of the analysis presented here is the inclusion of massive neutrinos and how they may affect the bound on the axion mass. If neutrino masses belong to an inverted hierarchy scheme, for example, the above constraint is improved to m_a < 0.38eV at the 95% c.l. (m_a < 0.67eV at the 99% c.l.). Future data from experiments as CAST will provide a direct test of the cosmological bound.

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Cited by 3 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. Beyond thermal approximations: Precise cosmological bounds on Axion-Like Particles

    astro-ph.CO 2026-02 conditional novelty 6.0 of 10

    Solving the momentum-dependent Boltzmann equation and propagating the exact non-thermal ALP spectrum into CMB analyses yields 95% limits f_a>1.63e6 GeV (e), 9.41e6 GeV (mu), 8.06e4 GeV (tau), and g_a_gamma<1.98e-8 GeV^-1.

  3. Axions as Dark Matter, Dark Energy, and Dark Radiation

    hep-ph 2025-09 unverdicted novelty 2.0 of 10

    A mini-review of axion phenomenology showing how light bosons can account for dark matter, drive cosmic acceleration, or contribute to relativistic backgrounds in the early and late Universe.

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