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Relic density of neutrinos with primordial asymmetries · Around

2008

Relic density of neutrinos with primordial asymmetries

Pastor, Sergio, Pinto, Teguayco, Raffelt, Georg

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We study flavor oscillations in the early universe, assuming primordial neutrino-antineutrino asymmetries.

Including collisions and pair processes in the kinetic equations, we not only estimate the degree of flavor equilibration, but for the first time also kinetic equilibration among neutrinos and with the ambient plasma.
Typically the restrictive BBN bound on the nue-antinue asymmetry indeed applies to all flavors as claimed in the previous literature, 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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