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Revisiting signatures of thermal axions in nonstandard cosmologies

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arxiv 2308.01352 v2 pith:LMVVLT7R submitted 2023-08-02 hep-ph astro-ph.CO

Paola Arias , Nicolás Bernal , Jacek K. Osiński , Leszek Roszkowski , Moira Venegas This is my paper · ORCID
classification hep-phastro-ph.CO
keywords axionscosmologiesthermalaxionkination-likemassesnonstandardscenarios
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We revisit the formation of a thermal population of hadronic axions in nonstandard cosmologies, in light of the recent developments in obtaining continuous and smooth interaction rates for both the gluon and photon couplings. For certain cosmological histories, such as low-temperature reheating (LTR) and kination-like scenarios, the thermalization of the axion can be severely delayed to higher masses. In the case that thermal equilibrium is achieved, we improve the constraints on LTR for axion masses around the eV scale with respect to previous works and we constrain for the first time early matter-dominated (EMD) cosmologies. We also point out the possibility of having the co-existence of cold and warm dark matter populations of axions in kination-like scenarios in the eV mass range.

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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. Catalogues of Cosmologically Self-Consistent Hadronic QCD Axion Models

    hep-ph 2024-12 conditional novelty 7.0 of 10

    Hadronic axion models with d=6 and d=7 heavy-quark decay operators can produce two new cosmologically viable 'islands' at f_a ~ 10^12 and 10^14 GeV, extending the post-inflationary axion search window.

  2. Free streaming of warm wave dark matter in modified expansion histories

    astro-ph.CO 2024-12 conditional novelty 6.0 of 10

    Warm wave dark matter free streaming can shift by up to roughly 40% in a very early dark energy cosmology, while early matter domination moves the signal to unobservably small scales.

  3. $Z'$-Mediated Dark Matter with Low-Temperature Reheating

    hep-ph 2024-12 accept novelty 4.0 of 10

    Low-temperature reheating shifts the relic-density contours of Z'-mediated dark matter so that WIMP and FIMP solutions merge and new regions become testable.

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