High Energy Physics - Phenomenology
arXiv:hep-ph/0504059 (hep-ph)
[Submitted on 7 Apr 2005]
Title:New cosmological mass limit on thermal relic axions
Authors:S.Hannestad (Aarhus U., Aarhus),A.Mirizzi (Bari U. & INFN, Bari & Munich, Max Planck Inst.),G.Raffelt (Max Planck Inst., Munich)
View a PDF of the paper titled New cosmological mass limit on thermal relic axions, by S.Hannestad (Aarhus U. and 6 other authors
View PDFAbstract: Observations of the cosmological large-scale structure provide well-established neutrino mass limits. We extend this argument to thermal relic axions. We calculate the axion thermal freeze-out temperature and thus their cosmological abundance on the basis of their interaction with pions. For hadronic axions we find a new mass limit $m_a<1.05$ eV (95% CL), corresponding to a limit on the axion decay constant of $f_a>5.7\times 10^6$ GeV. For other models this constraint is significantly weakened only if the axion-pion coupling is strongly suppressed. For comparison we note that the same approach leads to $\sum m_\nu<0.65$ eV (95% CL) for neutrinos.
| Comments: | (17 pages, 12 eps figures) |
| Subjects: | High Energy Physics - Phenomenology (hep-ph); Astrophysics (astro-ph) |
| Cite as: | arXiv:hep-ph/0504059 |
| (orarXiv:hep-ph/0504059v1 for this version) | |
| https://doi.org/10.48550/arXiv.hep-ph/0504059 arXiv-issued DOI via DataCite | |
| Journal reference: | JCAP0507:002,2005 |
| Related DOI: | https://doi.org/10.1088/1475-7516/2005/07/002 DOI(s) linking to related resources |
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View a PDF of the paper titled New cosmological mass limit on thermal relic axions, by S.Hannestad (Aarhus U. and 6 other authors
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