Cosmological mass limits on neutrinos, axions, and other light particles

Details Cosmological mass limits on neutrinos, axions, and other light particles Cosmological mass limits on neutrinos, axions, and other light particles

2003-12-11

arxiv.org/abs/hep-ph/0312154v2

JCAP 0404 (2004) 008

Physics

High Energy Physics

High Energy Physics - Phenomenology

15 pages, 6 figures, matches version in JCAP

Scientific paper

10.1088/1475-7516/2004/04/008

The small-scale power spectrum of the cosmological matter distribution together with other cosmological data provides a sensitive measure of the hot dark matter fraction, leading to restrictive neutrino mass limits. We extend this argument to generic cases of low-mass thermal relics. We vary the cosmic epoch of thermal decoupling, the radiation content of the universe, and the new particle's spin degrees of freedom. Our treatment covers various scenarios of active plus sterile neutrinos or axion-like particles. For three degenerate massive neutrinos, we reproduce the well-known limit of m_nu < 0.34 eV. In a 3+1 scenario of 3 massless and 1 fully thermalized sterile neutrino we find m_nu < 1.0 eV. Thermally produced QCD axions must obey m_a < 3.0 eV, superseding limits from a direct telescope search, but leaving room for solar eV-mass axions to be discovered by the CAST experiment.

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