Bianchi-I cosmology from causal thermodynamics
Abstract
We investigate diagonal Bianchi-I spacetimes in the presence of viscous fluids by using the shear and the anisotropic pressure components as the basic variables, where the viscosity is driven by the (second-order) causal thermodynamics. A few exact solutions are presented, among which we mention the anisotropic versions of de Sitter/anti-de Sitter geometries as well as an asymptotically isotropic spacetime presenting an effective constant cosmic acceleration without any cosmological constant. The qualitative analysis of the solutions for barotropic fluids with linear equations of state suggests that the behaviour is quite general.
Keywords
Cite
@article{arxiv.1610.00020,
title = {Bianchi-I cosmology from causal thermodynamics},
author = {Eduardo Bittencourt and Leandro G. Gomes and Renato Klippert},
journal= {arXiv preprint arXiv:1610.00020},
year = {2017}
}
Comments
19 pages, 1 figure. An appendix concerning the diagonalizability of Bianchi type-I spacetimes was included. This matches the published version