Mixed dark matter with neutrino chemical potentials

Abstract

Mixed dark matter models with one low-mass (e.g. 2.4eV) neutrino flavor are shown to be in good agreement with observations if the neutrinos have non-zero chemical potentials. This agreement holds (except for the problem with a low-age Universe) even for high values of the Hubble-parameter. Massless neutrinos with non-zero chemical potentials may reconcile cold dark matter with observations. Some fine-tuning is required to avoid problems with Big Bang nucleosynthesis.

14 pages+1 figure, postscript. Physical Review D (in press)

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• Remarks on the Boomerang results, the baryon density and the leptonic asymmetry
• Measuring the cosmological lepton asymmetry through the CMB anisotropy
• Neutrino degeneracy effect on neutrino oscillations and primordial helium yield
• Constraints on Neutrino Degeneracy from the Cosmic Microwave Background and Primordial Nucleosynthesis
• Cosmological measurement of neutrino mass in the presence of leptonic asymmetry
• Varying leptonic chemical potentials and spatial variation of primordial deuterium at high z
• Mixed dark matter with low-mass bosons
• Cosmological Implications of Massive Neutrinos