Mathematics – Logic
Scientific paper
Jan 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...243l...1k&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 243, Jan. 1, 1981, p. L1-L4.
Mathematics
Logic
30
Cosmology, Galactic Evolution, Neutrinos, Particle Mass, Particle Flux Density, Relativistic Particles, Universe
Scientific paper
The cosmological implications of the finite neutrino rest mass indicated by recent experiments are investigated. Following brief reviews of relevant neutrino properties, the thermal history of the universe and the role of primordial density fluctuations in galaxy formation, it is pointed out that neutrinos will decouple while still relativistic at temperatures of approximately 1 MeV, however all fluctuations entering the particle horizon will diffuse while the neutrinos are still relativistic. The Zel'dovich amplitude for density perturbations is found to be less than the required value at recombination, consistent with present observations of the microwave background. Calculations are then presented of the minimum neutrino mass perturbation, which corresponds to the particle horizon at which the neutrinos become nonrelativistic. It is shown that for a neutrino mass on the order of 90 eV, the mass and virialized velocity dispersion of the minimum perturbations are characteristic of those suggested for dark galactic haloes.
Klinkhamer Frans Richard
Norman Colin A.
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