Imprint of Sterile Neutrinos in the Cosmic Microwave Background Radiation

Abstract

The existence of low-mass sterile neutrinos is suggested by the current status of solar and atmospheric neutrinos together with the LSND experiment. In typical four-flavor scenarios, neutrinos would contribute to a cosmic hot dark matter component and to an increased radiation content at the epoch of matter-radiation equality. These effects leave their imprint in sky maps of the cosmic microwave background radiation (CMBR) and may thus be detectable with the precision measurements of the upcoming MAP and PLANCK missions.

5 pages, 2 postscript figures, matches version to appear in PRD

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• Mirror matter and primordial black holes
• Implications of mirror neutrinos for early universe cosmology
• Direct Detection of the Cosmic Neutrino Background Including Light Sterile Neutrinos
• Can active-sterile neutrino oscillations lead to chaotic behavior of the cosmological lepton asymmetry?
• On chaoticity of the amplification of the neutrino asymmetry in the early universe
• Captures of Hot and Warm Sterile Antineutrino Dark Matter on EC-decaying Ho-163 Nuclei
• Probing neutrino decays with the cosmic microwave background
• Active-sterile neutrino oscillations in the early Universe: asymmetry generation at low |delta m^2| and the Landau-Zener approximation
• Detailed study of BBN implications of neutrino oscillation generated neutrino asymmetries in some four neutrino models
• Physical origin of "chaoticity" of neutrino asymmetry
• Neutrino Physics at the Turn of the Millenium
• Neutrino oscillations and Big Bang Nucleosynthesis
• Neutrino physics from cosmological observations