Neutrino masses in astroparticle physics

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• 作者：Raffelt ; Georg G.
• 关键词：Elementary particles ; Dark matter ; Cosmology ; theory ; Supernovae ; general
• 刊名：New Astronomy Reviews
• 出版年：2002
• 期刊代码：40_13876473
• 类别：ph
• 出版时间：October, 2002
• 卷：46
• 期：11
• 页码：699-708
• 文件大小：260 K

摘要

The case for small neutrino mass differences from atmospheric and solar neutrino oscillation experiments has become compelling, but leaves the overall neutrino mass scale m_ν undetermined. The most restrictive limit of m_ν<0.8eV arises from the 2dF galaxy redshift survey in conjunction with the standard theory of cosmological structure formation. A relation between the hot dark matter fraction and m_ν depends on the cosmic number density n_ν of neutrinos. If solar neutrino oscillations indeed correspond to the favored large mixing angle MSW solution, then big-bang nucleosynthesis gives us a restrictive limit on all neutrino chemical potentials, removing the previous uncertainty of n_ν. Therefore, a possible future measurement of m_ν will directly establish the cosmic neutrino mass fraction Ω_ν. Cosmological neutrinos with sub-eV masses can play an interesting role for producing the highest-energy cosmic rays (Z-burst scenario). Sub-eV masses also relate naturally to leptogenesis scenarios of the cosmic baryon asymmetry. Unfortunately, the time-of-flight dispersion of a galactic or local-group supernova neutrino burst is not sensitive in the sub-eV range.