Relic Density of Neutrinos with Primordial Asymmetries

Journal Article · Fri Jun 19 04:00:00 EDT 2009 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.102.241302· OSTI ID:21346965

Pastor, Sergio; Pinto, Teguayco ^[1]; Raffelt, Georg G ^[2]

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1. Institut de Fisica Corpuscular (CSIC-Universitat de Valencia), Ed. Instituts d'Investigacio, Apt. 22085, 46071 Valencia (Spain)
2. Max-Planck-Institut fuer Physik (Werner-Heisenberg-Institut), Foehringer Ring 6, 80805 Muenchen (Germany)

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 big-bang nucleosynthesis bound on the nu{sub e}nu{sub e} 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.

• OSTI ID: 21346965
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 24 Vol. 102; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANTILEPTONS
ANTIMATTER
ANTINEUTRINOS
ANTIPARTICLES
ASYMMETRY
COMPOSITE MODELS
ELEMENTARY PARTICLES
EQUATIONS
FERMIONS
FLAVOR MODEL
KINETIC EQUATIONS
LEPTONS
MASSLESS PARTICLES
MATHEMATICAL MODELS
MATTER
NEUTRINOS
NUCLEOSYNTHESIS
OSCILLATIONS
PARTICLE MODELS
PLASMA
QUARK MODEL
SYNTHESIS
UNIVERSE