Phys. Rev. D 68, 023504 (2003) [8 pages]Internal symmetry in Bianchi type-I cosmologiesReceived 19 December 2002; published 2 July 2003 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. © 2003 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevD.68.023504
DOI:
10.1103/PhysRevD.68.023504
PACS:
98.80.Jk, 04.20.Jb
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