Physics
Scientific paper
Jul 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993ap%26ss.205..259m&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 205, no. 2, p. 259-276.
Physics
3
Cosmic Rays, Equations Of State, Field Theory (Physics), Relativity, Two Fluid Models, Anisotropic Media, Rotating Matter, Universe
Scientific paper
Radiating anisotropic two-fluid model universes coupled with a scalar field when a slow rotation is introduced in them are studied here, where the anisotropic pressure is generated by the presence of two noninteracting perfect fluids which are in relative motion with respect to each other. The physically interesting class of models in which one fluid is a comoving radiative perfect fluid which is taken to model the cosmic microwave background and the second a non-comoving perfect fluid which will model the observed material content of the universe. The effects of rotation on these models are studied and the reactions of the scalar and the radiation fields with respect to the rotational motion are discussed. The amount of anisotropy induced in the pressure distribution by a small deviation from the Friedmann metric is investigated. It is shown that such anisotropies could grow faster than the expansion of the universe. The rotating models obtained here may be taken as physically acceptable models.
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