Steen Hannestad and Georg Raffelt JCAP04(2004)008 doi:10.1088/1475-7516/2004/04/008
Steen Hannestad1 and Georg Raffelt2
Show affiliationsThe 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 mν<0.34 eV. In a 3+1 scenario of 3 massless and 1 fully thermalized sterile neutrinos we find mν<1.0 eV. Thermally produced QCD axions must obey ma<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.
E-print Number: hep-ph/0312154
Cited: by |
Refers: to
14.60.Pq Neutrino mass and mixing
95.85.Ry Neutrino, muon, pion, and other elementary particles; cosmic rays
14.80.Mz Axions and other Nambu-Goldstone bosons (Majorons, familons, etc.)
95.35.+d Dark matter (stellar, interstellar, galactic, and cosmological)
Issue 04 (April 2004)
Received 3 February 2004, accepted for publication 14 April 2004
Published 29 April 2004
Steen Hannestad and Georg Raffelt JCAP04(2004)008
Steven A. Abel et al JHEP12(2000)026
Michael R. Ramage and Graham G. Ross JHEP08(2005)031
Pran Nath and Raza M. Syed JHEP02(2006)022
T Müller et al 2008 New J. Phys. 10 073006
Graciela Gelmini et al JCAP06(2005)012
Mariana Graña et al JHEP08(2004)046
A Arenas et al 2008 New J. Phys. 10 053039
G Ratel et al 2007 Metrologia 44 06002
Margareta Wallquist et al 2008 New J. Phys. 10 063005