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ARPN Journal of Science and Technology >> Volume 7, Issue 1, January 2017

ARPN Journal of Science and Technology

Cosmological Consequences with Time Dependent ∧ -Term in Bianchi Type-I Space-Time-Revisited

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Author Arunesh Kumar Pandey, R. K. Mishra, Anirudh Pradhan
ISSN 2225-7217
On Pages 908-914
Volume No. 3
Issue No. 9
Issue Date October 01, 2013
Publishing Date October 01, 2013
Keywords Cosmology, Variable cosmological term, Perfect fluid models, Statefinder parameters


Einsteinís field equations with variable cosmological constant ∧ in presence of perfect fluid for a homogeneous and anisotropic Bianchi type-I space-time has been studied by generalizing recent results (Pradhan et al., in JBAP 2: 50, 2013). Einsteinís field equations are exactly solved by considering a scale factor a(t) =vt^n.e^t, where n is a positive constant which yields a time-dependent deceleration parameter (DP) q = -1 + 2n/(n+t)^2 , representing a model which generates a transition of the universe from the early decelerating phase to the recent accelerating phase. The cosmological constant ∧ is found to be a decreasing function of time and it approaches a small positive value at the present epoch which is corroborated by consequences from recent supernovae Ia observations. From recently developed Statefinder diagnostic, the behaviour of different stages of the evolution of the universe has been studied. The physical and geometric properties of the cosmological models have also been described.

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