Neutrino Oscillations and Neutrino Decoupling in the Early Universe

Details Neutrino Oscillations and Neutrino Decoupling in the Early Universe Neutrino Oscillations and Neutrino Decoupling in the Early Universe

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002nmgm.meet.2395k&link_type=abstract

"THE NINTH MARCEL GROSSMANN MEETING On Recent Developments in Theoretical and Experimental General Relativity, Gravitation and R

Physics

Scientific paper

We consider neutrino oscillations in the early universe between electron neutrino and sterile neutrino. In the standard cosmology, the neutrino temperature, Tν, evolves differently from the photon temperature, T, by the amount of (4/11)1/3 after the neutrino decoupling because they do not share the entropy transfer from e± to photons. But if the neutrino oscillations occurr in the early universe, the change in the neutrino abundance due to neutrino oscillations may cause the modification of the relationship between Tν and T. In this work we study the effect of the neutrino oscillations on the evolution of neutrino abundance and neutrino temperature in the early universe.

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