Internal symmetry in Bianchi type-I cosmologies

Details Internal symmetry in Bianchi type-I cosmologies Internal symmetry in Bianchi type-I cosmologies

2003-04-07

arxiv.org/abs/gr-qc/0304033v2

Phys.Rev. D68 (2003) 023504

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

19 pages, minor changes, accepted for publication in PRD

Scientific paper

10.1103/PhysRevD.68.023504

Using the one-parameter internal symmetry group in the Bianchi type-I spacetime for cosmological models with a perfect fluid, we show that a system of coordinates exists in the associated internal space where two scale factors become equal. We find the general solution for an anisotropic model containing a perfect fluid with constant baryotropic index and investigate the asymptotic regimes. We obtain exact solutions for a set of anisotropic fluids which includes an anisotropic stiff fluid.

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