WMAPping out Neutrino Masses

Details WMAPping out Neutrino Masses WMAPping out Neutrino Masses

2003-02-17

arxiv.org/abs/hep-ph/0302131v4

Phys.Lett.B581:218-223,2004

Physics

High Energy Physics

High Energy Physics - Phenomenology

5 pages, 2 figures. v2:Streamlined discussion of thermalization; improved discussion of large lepton asymmetry. v3: Added Refe

Scientific paper

10.1016/j.physletb.2003.11.075

Recent data from from the Wilkinson Microwave Anisotropy Probe (WMAP) place important bounds on the neutrino sector. The precise determination of the baryon number in the universe puts a strong constraint on the number of relativistic species during Big-Bang Nucleosynthesis. WMAP data, when combined with the 2dF Galaxy Redshift Survey (2dFGRS), also directly constrain the absolute mass scale of neutrinos. These results impinge upon a neutrino oscillation interpretation of the result from the Liquid Scintillator Neutrino Detector (LSND). We also note that the Heidelberg--Moscow evidence for neutrinoless double beta decay is only consistent with the WMAP+2dFGRS data for the largest values of the nuclear matrix element.

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