Observational Constraints on the Lepton Asymmetry and Radiation Energy Density

Details Observational Constraints on the Lepton Asymmetry and Radiation Energy Density Observational Constraints on the Lepton Asymmetry and Radiation Energy Density

Jan 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc..972..521p&link_type=abstract

EXOTIC NUCLEI AND NUCLEAR/PARTICLE ASTROPHYSICS (II): Proceedings of the Carpathian Summer School of Physics 2007. AIP Conferen

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Background Radiations, Origin And Formation Of The Universe, Observational Cosmology, Neutrino, Muon, Pion, And Other Elementary Particles, Cosmic Rays, Leptons

Scientific paper

By using most of the present Cosmic Microwave Background (CMB) and Large Scale Structure (LSS) measurements 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 ξν and the variation of the relativistic degrees of freedom, ΔNeffoth, due to possible unknown physical processes during BBN.
We found 0<ξν<0.788 (2σ) that implies a lepton asymmetry of the neutrino background 0.001These results bring an important improvement over the same parameters obtained by using the WMAP data alone, showing that the LSS measurements are useful tools in constraining the radiation content of the Universe during BBN.

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