Mathematics – Logic
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999cqgra..16.2269f&link_type=abstract
Classical Quantum Gravity, Vol. 16, No. 7, p. 2269 - 2282
Mathematics
Logic
Cosmological Models: Gravitational Radiation
Scientific paper
The authors study the tensor modes of perturbations of a two-fluid model in general relativity, where one of the fluids has the equation of state p = -ρ/3 (a variable cosmological constant, a cosmic string fluid, a texture) or p = -ρ (a cosmological constant), while the other is ordinary matter (radiation, stiff matter, incoherent matter). In case (a), with the stringlike fluid, the spatial section is compact but the scale factor evolves in a way similar to that in an open universe with positive pressure, providing alternative solutions for the age and horizon problems. The study of gravitational waves is extended to all values of the effective curvature keff = k - 8/3πGρ, that is, positive, negative or zero, k being the curvature of the spacelike section. In case (b), with a cosmological constant, the study is restricted to a flat spatial section. The behaviour of gravitational waves has, in each case, particular features, that can be reflected in the anisotropy spectrum of the cosmic microwave background radiation. The authors also discuss these exotic fluids as candidates for dark matter models.
Fabris Julio Cesar
Vitorino de Borba Gonçalves Sérgio
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