Cosmological bounds on sub-MeV mass axions

Details Cosmological bounds on sub-MeV mass axions Cosmological bounds on sub-MeV mass axions

2010-11-16

arxiv.org/abs/1011.3694v2

JCAP 1102:003,2011

Physics

High Energy Physics

High Energy Physics - Phenomenology

19 pages, 10 figures

Scientific paper

10.1088/1475-7516/2011/02/003

Axions with mass greater than 0.7 eV are excluded by cosmological precision data because they provide too much hot dark matter. While for masses above 20 eV the axion lifetime drops below the age of the universe, we show that the cosmological exclusion range can be extended from 0.7 eV till 300 keV, primarily by the cosmic deuterium abundance: axion decays would strongly modify the baryon-to-photon ratio at BBN relative to the one at CMB decoupling. Additional arguments include neutrino dilution relative to photons by axion decays and spectral CMB distortions. Our new cosmological constraints complement stellar-evolution limits and laboratory bounds.

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