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.

arXiv comment19 pages, 1 figure. An appendix concerning the diagonalizability of Bianchi type-I spacetimes was included. This matches the published version

References in corpus (6)

• How isotropic is the Universe?
• Observational Challenges for the Standard FLRW Model
• Is the Universe homogeneous?
• The initial singularity in solutions of the Einstein-Vlasov system of Bianchi type I
• Qualitative Analysis of Causal Anisotropic Viscous Fluid Cosmological Models
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Cited by in corpus (3)

• The Maxwell-Chern-Simons gravity and its cosmological implications
• Investigating the physical and geometrical parameters of the cosmological models with anisotropic background
• Nonlocal extension of causal thermodynamics of the isotropic cosmic fluid