Actions for Constraints on the relic neutrino abundance and implications for cosmological neutrino mass limits [electronic resource].

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Constraints on the relic neutrino abundance and implications for cosmological neutrino mass limits [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy, 2004.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
10 pages : digital, PDF file
Additional Creators
Fermi National Accelerator Laboratory, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
The authors examine a mechanism which can lead to flavor transformation of neutrino-antineutrino asymmetries in the early universe, a process which is unavoidable when the neutrino mixing angles are large. This sets the best limit on the lepton number of the universe, and hence on the relic neutrino abundance. They also consider the consequences for the relic neutrino abundance if extra neutrino interactions are allowed, e.g., the coupling of the neutrinos to a light (compared to m{sub ν}) boson. For a wide range of couplings not excluded by other considerations, the relic neutrinos would annihilate to bosons at late times, and thus make a negligible contribution to the matter density today. This mechanism evades the neutrino mass limits arising from large scale structure.
Report Numbers
E 1.99:fermilab-fn-0785-a
fermilab-fn-0785-a
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Note
Published through SciTech Connect.
01/01/2004.
"fermilab-fn-0785-a"
Bell, Nicole F.
Funding Information
AC02-76CH03000
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