Mathematics – Logic
Scientific paper
Jun 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994phrvd..49.6460v&link_type=abstract
Physical Review D (Particles, Fields, Gravitation, and Cosmology), Volume 49, Issue 12, 15 June 1994, pp.6460-6466
Mathematics
Logic
4
Exact Solutions, Numerical Relativity, Particle-Theory And Field-Theory Models Of The Early Universe
Scientific paper
We study the dynamical evolution of the cosmological density parameter Ω in the presence of shear and bulk viscosity (in first order as well as in extended nonequilibrium thermodynamical settings) perturbations, both analytically and numerically. Our results show that overall the main conclusions of Madsen and Ellis within the FLRW framework, namely, that (i) Ω rarely takes values close to unity throughout the evolution of the Universe, (ii) Ω~=1 is epoch and equation of state dependent, and (iii) the set of initial conditions leading to Ω≠1 at any particular epoch is nonzero remains robust with respect to such perturbations, particularly at late times. There are, however, important detailed changes to the dynamics at early times.
Elst Henk van
Tavakol Reza
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