Anisotropic cosmological models with a perfect fluid and a $Λ$ term

We consider a self-consistent system of Bianchi type-I (BI) gravitational field and a binary mixture of perfect fluid and dark energy given by a cosmological constant. The perfect fluid is chosen to be the one obeying either the usual equation of state, i.e., $p = ζ\ve$, with $ζ\in [0, 1]$ or a van der Waals equation of state. Role of the $Λ$ term in the evolution of the BI Universe has been studied.

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