Cosmic anisotropy with Reduced Relativistic Gas
Simpliciano Castardelli dos Reis, Ilya L.Shapiro
TL;DR
This paper studies how anisotropies in the universe evolve when filled with a relativistic gas model that transitions between radiation and matter, showing solutions tend to isotropy with pressureless matter.
Contribution
It extends the reduced relativistic gas model to Bianchi type I anisotropic universes, demonstrating evolution towards isotropy with pressureless matter.
Findings
Solutions evolve to isotropic universe
RRG model interpolates between radiation and matter
Anisotropies diminish over time
Abstract
The dynamics of cosmological anisotropies is investigated for Bianchi type I universe filled by a relativistic matter represented by the reduced relativistic gas model (RRG), with equation of state interpolating between radiation and matter. Previously it was shown that the interpolation is observed in the background cosmological solutions for homogeneous and isotropic universe and also for the linear cosmological perturbations. We extend the application of RRG to the Bianchi type I anisotropic model and find that the solutions evolve to the isotropic universe with the pressureless matter contents.
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