Cosmological Constant Dominated Transit Universe from the Early Deceleration Phase to the Current Acceleration Phase in Bianchi-V Spacetime

doi:10.1088/0256-307X/29/7/079801

Chin. Phys. Lett.

2012, Vol. 29

Issue (6): 079801 DOI: 10.1088/0256-307X/29/7/079801

GEOPHYSICS, ASTRONOMY, AND ASTROPHYSICS

Cosmological Constant Dominated Transit Universe from the Early Deceleration Phase to the Current Acceleration Phase in Bianchi-V Spacetime

YADAV Anil Kumar^*

Department of Physics, Anand Engineering College, Keetham, Agra-282 007, India

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YADAV Anil Kumar 2012 Chin. Phys. Lett. 29 079801

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Abstract We present the transition of the universe from the early decelerating phase to the current accelerating phase with viscous fluid and time-dependent cosmological constant Λ as a source of matter in Bianchi-V spacetime. To study the transit behaviour of the universe, we assume the scale factor as an increasing function of time, which generates a time-dependent deceleration parameter (DP). The study reveals that the cosmological term does not change its fundamental nature for ξ=const and ξ=ξ(t), where ξ is the coefficient of bulk viscosity. The Λ(t) is found to be positive and is a decreasing function of time. The same behavior was observed during recent supernovae observations. The physical behaviour of the universe is discussed in detail.

Received: 02 May 2012 Published: 31 May 2012

PACS:	98.80.Es	(Observational cosmology (including Hubble constant, distance scale, cosmological constant, early Universe, etc))
	98.80.-k	(Cosmology)

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https://cpl.iphy.ac.cn/10.1088/0256-307X/29/7/079801 OR https://cpl.iphy.ac.cn/Y2012/V29/I6/079801

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