Effect of neutrino asymmetry on the estimation of cosmological parameters

摘要

The recent analysis of the cosmic microwave background data carried out by the WMAP team seems to show that the sum of the neutrino masses is < 0.7 eV. However, this result is not model independent, depending on precise assumptions on the cosmological model. We study how this result is modifled when the assumption of perfect lepton symmetry is dropped out.