New cosmological limit on neutrino mass

We show that considerations of the equilibration of right- and left-handed neutrino seas in the early Universe and the well-known {sup 4}He constraint on the number of relativistic degrees of freedom extant at the nucleosynthesis epoch lead to a new limit on the Dirac neutrino mass of {ital m}{sub {...

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Veröffentlicht in:	Physical review. D, Particles and fields Particles and fields, 1991-05, Vol.43 (10), p.3136-3139
Hauptverfasser:	FULLER, G. M, MALANEY, R. A
Format:	Artikel
Sprache:	eng
Schlagworte:	640106 - Astrophysics & Cosmology- Cosmology CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS Classical and quantum physics: mechanics and fields COSMOLOGICAL MODELS DEGREES OF FREEDOM ELEMENTARY PARTICLES EVEN-EVEN NUCLEI Exact sciences and technology FERMIONS HELIUM 4 HELIUM ISOTOPES ISOTOPES LEPTONS LIGHT NUCLEI LIMITING VALUES MASS MASSLESS PARTICLES MATHEMATICAL MODELS NEUTRINOS NUCLEI NUCLEOSYNTHESIS ORIGIN Physics REST MASS STABLE ISOTOPES SYNTHESIS Theory of quantized fields
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Beschreibung
Zusammenfassung:	We show that considerations of the equilibration of right- and left-handed neutrino seas in the early Universe and the well-known {sup 4}He constraint on the number of relativistic degrees of freedom extant at the nucleosynthesis epoch lead to a new limit on the Dirac neutrino mass of {ital m}{sub {nu}}{much lt}300 keV. This constraint would apply to any neutrino so long as it had a purely Dirac mass and a lifetime exceeding the nucleosynthesis time scale.
ISSN:	0556-2821 1089-4918
DOI:	10.1103/PhysRevD.43.3136