New cosmological mass limit on thermal relic axions

Details New cosmological mass limit on thermal relic axions New cosmological mass limit on thermal relic axions

2005-04-07

arxiv.org/abs/hep-ph/0504059v1

JCAP0507:002,2005

Physics

High Energy Physics

High Energy Physics - Phenomenology

(17 pages, 12 eps figures)

Scientific paper

10.1088/1475-7516/2005/07/002

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.

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