Isotropy of the universe and equation of state of vacuum

Details Isotropy of the universe and equation of state of vacuum Isotropy of the universe and equation of state of vacuum

Mar 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980ncimb..56..125f&link_type=abstract

Nuovo Cimento B, Serie 11, vol. 56B, Mar. 11, 1980, p. 125-136.

Mathematics

Logic

6

Astronomical Models, Cosmology, Equations Of State, Isotropy, Universe, Vacuum, Anisotropy, Einstein Equations, Flux Density, Stress Tensors

Scientific paper

The isotropization of homogeneous cosmological models is investigated, including a phenomenological analysis of the contribution of vacuum polarization to the energy content of the universe. The combined effect of dissipative processes at early epochs and of vacuum at relatively late epochs guarantees the isotropy of the universe at large times for arbitrary initial anisotropies, provided the universe expands forever and the vacuum has positive energy density and negative stresses with a sufficiently hard equation of state. Isotropy at the present epoch is secured by a negative deceleration parameter consistent with observation.

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