Cosmological implications of axion-matter couplings
| Autor: | Daniel Green, Yi Guo, Benjamin Wallisch |
|---|---|
| Rok vydání: | 2022 |
| Předmět: |
High Energy Physics - Theory
High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics (astro-ph.CO) High Energy Physics - Phenomenology (hep-ph) High Energy Physics - Theory (hep-th) FOS: Physical sciences Astronomy and Astrophysics Astrophysics - Cosmology and Nongalactic Astrophysics |
| Zdroj: | Journal of Cosmology and Astroparticle Physics. 2022:019 |
| ISSN: | 1475-7516 |
| Popis: | Axions and other light particles appear ubiquitously in physics beyond the Standard Model, with a variety of possible couplings to ordinary matter. Cosmology offers a unique probe of these particles as they can thermalize in the hot environment of the early universe for any such coupling. For sub-MeV particles, their entropy must leave a measurable cosmological signal, usually via the effective number of relativistic particles, $N_\mathrm{eff}$. In this paper, we will revisit the cosmological constraints on the couplings of axions and other pseudo-Nambu-Goldstone bosons to Standard Model fermions from thermalization below the electroweak scale, where these couplings are marginal and give contributions to the radiation density of $\Delta N_\mathrm{eff} > 0.027$. We update the calculation of the production rates to eliminate unnecessary approximations and find that the cosmological bounds on these interactions are complementary to astrophysical constraints, e.g. from supernova SN 1987A. We additionally provide quantitative explanations for these bounds and their relationship. Comment: 40 pages, 11 figures; v2: minor changes, matches published version |
| Databáze: | OpenAIRE |
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