Abstract
The Einstein field equations with perfect fluid source and variable Λ andG for Bianchi-type universes are studied under the assumption of a power-law time variation of the expansion factor, achieved via a suitable power-law assumption for the Hubble parameter suggested by M. S. Berman. All the models have a power-law variation of pressure and density and are singular at the epocht=0. The variation ofG(t) as 1/t and Λ(t) as 1/t 2 is consistent with these models.
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