Abstract
Bianchi Type-I cosmological models containing perfect fluid with time varying G and Λ have been presented. The solutions obtained represent an expansion scalar θ bearing a constant ratio to the anisotropy in the direction of space-like unit vector λ i. Of the two models obtained, one has negative vacuum energy density, which decays numerically. In this model, we obtain Λ ∼ H 2, Λ ∼ R 44/R and Λ ∼ T −2 (T is the cosmic time) which is in accordance with the main dynamical laws for the decay of Λ. The second model reduces to a static solution with repulsive gravity.
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Singh, J.P., Tiwari, R.K. Perfect fluid bianchi Type-I cosmological models with time varying G and Λ. Pramana - J Phys 70, 565–574 (2008). https://doi.org/10.1007/s12043-008-0019-y
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DOI: https://doi.org/10.1007/s12043-008-0019-y