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Title:
The neutrino mass in elementary particle physics and in big bang cosmology
Authors:
ZELDOVICH, IA. B.; KHLOPOV, M. IU.
Affiliation:
AB(Akademiia Nauk SSSR, Institut Prikladnoi Matematiki, Moscow, USSR)
Journal:
(Uspekhi Fizicheskikh Nauk, vol. 135, Sept. 1981, p. 45-77.) Soviet Physics - Uspekhi, vol. 24, Sept. 1981, p. 755-774. Translation.
Publication Date:
09/1981
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
BIG BANG COSMOLOGY, ELEMENTARY PARTICLE INTERACTIONS, NEUTRINOS, PARTICLE MASS, PARTICLE THEORY, ASTROPHYSICS, DIRAC EQUATION, ELECTROMAGNETIC INTERACTIONS, HEAVY NUCLEI, LEPTONS, NUCLEAR FUSION, OSCILLATIONS, PARITY, PARTICLE FLUX DENSITY, RADIOACTIVE DECAY, SOLAR NEUTRINOS, STRONG INTERACTIONS (FIELD THEORY), WEAK INTERACTIONS (FIELD THEORY)
Bibliographic Code:
1981SvPhU.135...45Z

Abstract

Some theoretical aspects of a nonzero value for the neutrino rest mass and its possible implications for physics are discussed. The nature of the neutrino mass is analyzed, as well as the physical consequences that may derive from the existence of new helicity states for the neutrino, or from lepton charge nonconservation, if the mass is of Dirac or Majorana character, respectively. Massive neutrinos are examined in the context of grand unified theories combining the weak, strong, and electromagnetic interactions. Searches for neutrino mass effects in beta decay and for neutrino oscillations are reviewed. Several astrophysical effects of the neutrino mass are described: solar neutrino oscillations, the decay of primordial neutrinos, the feasibility of detecting massive primordial neutrinos experimentally. The predictions of big bang theory regarding the neutrino number density in the universe are analyzed, and a discussion is given of thyinfluence neutrino oscillations might have on the neutrino density and on cosmological nucleosynthesis. 
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