Inhomogeneous two-fluid cosmologies.

Details Inhomogeneous two-fluid cosmologies. Inhomogeneous two-fluid cosmologies.

Oct 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988gregr..20.1019l&link_type=abstract

General Relativity and Gravitation, Volume 20, Issue 10, pp.1019-1035

Mathematics

Logic

9

Cosmological Models:General Relativity, General Relativity:Cosmological Models

Scientific paper

A new class of expanding cosmological solutions is derived. The matter content of these models is a mixture of two interacting simple fluids: the first one, homogeneous and isotropic with equation of statep = (γ-1)ρ, the dynamics of which is given by the FRW equation and the second one an inhomogenous dust. The limiting case of two dusts corresponds to the Szekeres' universes of class II. A large subclass of the models evolve to a FRW phase for all physically meaningful values of the polytropic indexγ and the curvature parameterk. A gauge condition, under which the metric is invariant, is shown to exist for k≠0. In particular, it explains why the parabolic model is a peculiar solution in the class found by Szekeres.

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