Relic density of neutrinos with primordial asymmetries

Details Relic density of neutrinos with primordial asymmetries Relic density of neutrinos with primordial asymmetries

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010jphcs.203a2053p&link_type=abstract

Journal of Physics: Conference Series, Volume 203, Issue 1, pp. 012053 (2010).

Physics

Scientific paper

We study flavor neutrino oscillations in the early universe, assuming primordial ν-bar nu asymmetries. Including collisions and pair processes in the kinetic equations, we estimate the degree of flavor equilibration and, for the first time, kinetic equilibration among neutrinos and with the ambient plasma. Typically the restrictive BBN bound on the νebar nue asymmetry indeed applies to all flavors as previously claimed, but fine-tuned initial asymmetries always allow for a large surviving neutrino excess radiation that may show up in precision cosmological data.

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