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- W2949635000 abstract "By using most of the present CMB and LSS measurements and the BBN constraints on the primordial helium abundance, Y_p, we set bounds on the radiation content of the Universe and neutrino properties. We consider lepton asymmetric cosmological models parametrized by the neutrino degeneracy parameter xi_{nu} and the variation of the relativistic degrees of freedom, Delta N_{oth}^{eff}, due to possible other physical processes that occurred between BBN and structure formation epoch. We found that present CMB and LSS data constraints the neutrino degeneracy parameter at xi_{nu} leq 0.722, implying a lepton asymmetry of the neutrino background {cal L}_{nu} leq 0.614 (2-sigma). We also found Delta N^{eff}_{oth}=0.572^{+1.972}_{-1.780}, the contribution to the effective number of relativistic neutrino species N^{eff}=3.058^{+1.971}_{-1.178} and a primordial helium abundance Y_p=0.249^{+0.014}_{-0.016} (2-sigma errors). These results bring an important improvement over the similar ones obtained by using WMAP~1-year and older LSS data or the WMAP~3-year data alone and the standard primordial helium abundance value Y_p=0.24, relaxing the stringent BBN constraint on the neutrino degeneracy parameter (xi_{nu} leq 0.07). We forecast that the CMB temperature and polarization maps observed with high angular resolutions and sensitivity by the future Planck Mission will constraint the primordial primordial helium abundance at Y_p=0.247 pm 0.002 (2-sigma errors) in agreement with the most stringent limits on Y_p given by the BBN and the neutrino degeneracy parameter at xi_{nu} leq 0.280 (2-sigma), not excluding the possibility of larger lepton asymmetry. This work has been done on behalf of Planck-LFI activities." @default.
- W2949635000 created "2019-06-27" @default.
- W2949635000 creator A5044900361 @default.
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- W2949635000 date "2008-01-25" @default.
- W2949635000 modified "2023-09-26" @default.
- W2949635000 title "Constraints on the lepton asymmetry and radiation energy density: Implications for PLANCK" @default.
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- W2949635000 hasPublicationYear "2008" @default.
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