Bianchi-I cosmology from causal thermodynamics
| Autor: | Leandro G. Gomes, Eduardo Bittencourt, R. Klippert |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Physics
Physics and Astronomy (miscellaneous) Spacetime 010308 nuclear & particles physics Isotropy FOS: Physical sciences Thermodynamics General Relativity and Quantum Cosmology (gr-qc) Mathematical Physics (math-ph) Cosmological constant 01 natural sciences Cosmology General Relativity and Quantum Cosmology Physics::Fluid Dynamics De Sitter universe Barotropic fluid 0103 physical sciences 010306 general physics Constant (mathematics) Linear equation Mathematical Physics |
| Popis: | 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. 19 pages, 1 figure. An appendix concerning the diagonalizability of Bianchi type-I spacetimes was included. This matches the published version |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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