Neutrino viscosity and isotropization of Bianchi Type-VIII and Type-IX cosmological models

Details Neutrino viscosity and isotropization of Bianchi Type-VIII and Type-IX cosmological models Neutrino viscosity and isotropization of Bianchi Type-VIII and Type-IX cosmological models

Jun 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979ncimb..51..201c&link_type=abstract

Nuovo Cimento B, Serie 11, vol. 51B, June 11, 1979, p. 201-221.

Mathematics

Logic

Cosmology, Isotropic Media, Neutrinos, Anisotropic Media, Curvature, Einstein Equations, Energy Dissipation, Entropy, Hubble Constant, Magnitude, Phonons, Viscosity

Scientific paper

The isotropization of Bianchi Type VIII and Type IX spaces due to neutrino viscosity is investigated. It is found that, owing to a peculiar coupling between curvature and anisotropy, neutrino viscosity does not guarantee the present-day isotropy of the cosmological expansion in such spaces. The observed isotropy of the background radiation imposes stringent limits either on the initial anisotropy or on the curvature of space, in contrast with the principle of chaotic cosmology. On the other hand, the amplification of the radiation entropy depends weakly on curvature and may be as large as 10 to the 12th.

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