Cosmological constraints on decaying axion-like particles: a global analysis
| Autor: | Balázs, Csaba, Bloor, Sanjay, Gonzalo, Tomás E., Handley, Will, Hoof, Sebastian, Kahlhöfer, Felix Karl David, Lecroq, Marie, Marsh, David J. E., Renk, Janina J., Scott, Pat, Stöcker, Patrick |
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| Přispěvatelé: | Apollo - University of Cambridge Repository |
| Rok vydání: | 2022 |
| Předmět: |
axions
Cosmology and Nongalactic Astrophysics (astro-ph.CO) Physics FOS: Physical sciences Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Physics::Geophysics High Energy Physics - Phenomenology particle physics-cosmology connection High Energy Physics - Phenomenology (hep-ph) particle physics - cosmology connection ddc:530 Astrophysics - Cosmology and Nongalactic Astrophysics |
| Zdroj: | Journal of cosmology and astroparticle physics : JCAP 12, 027 (2022). doi:10.1088/1475-7516/2022/12/027 Journal of Cosmology and Astroparticle Physics, 2022 (12), Art.-Nr.: 027 |
| ISSN: | 1475-7516 1475-7508 |
| DOI: | 10.48550/arxiv.2205.13549 |
| Popis: | Axion-like particles (ALPs) decaying into photons are known to affect a wide range of astrophysical and cosmological observables. In this study we focus on ALPs with masses in the keV-MeV range and lifetimes between $10^4$ and $10^{13}$ seconds, corresponding to decays between the end of Big Bang Nucleosynthesis and the formation of the Cosmic Microwave Background (CMB). Using the CosmoBit module of the global fitting framework GAMBIT, we combine state-of-the-art calculations of the irreducible ALP freeze-in abundance, primordial element abundances (including photodisintegration through ALP decays), CMB spectral distortions and anisotropies, and constraints from supernovae and stellar cooling. This approach makes it possible for the first time to perform a global analysis of the ALP parameter space while varying the parameters of $\Lambda$CDM as well as several nuisance parameters. We find a lower bound on the ALP mass of around $m_a > 300\,\text{keV}$, which can only be evaded if ALPs are stable on cosmological timescales. Future observations of CMB spectral distortions with a PIXIE-like mission are expected to improve this bound by two orders of magnitude. Comment: 29+16 pages, 9 figures. V2 corresponds to the published version. Auxiliary material available on Zenodo at https://zenodo.org/record/6573347 |
| Databáze: | OpenAIRE |
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