New cosmological mass limit on thermal relic axions

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dc.creatorHannestad, S.
dc.creatorMirizzi, A.
dc.creatorRaffelt, G.
dc.date2005-04-07
dc.date.accessioned2026-07-07T10:44:17Z
dc.date.available2026-07-07T10:44:17Z
dc.descriptionObservations 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 $\sum m_ν<0.65$ eV (95% CL) for neutrinos.
dc.description(17 pages, 12 eps figures)
dc.identifierhttps://arxiv.org/abs/hep-ph/0504059
dc.identifierhttp://arxiv.org/abs/hep-ph/0504059
dc.identifierJCAP0507:002,2005
dc.identifierdoi:10.1088/1475-7516/2005/07/002
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/182539
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectAstrophysics
dc.titleNew cosmological mass limit on thermal relic axions
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