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

• 来源期刊: 中国物理快报（英文版）
• 年，卷（期）: 2012,（7）
• 页码范围: 298-302
• 页数: 5页
• 语种: 英文
• DOI: 10.1088/0256-307X/29/7/079801

摘要

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 (A) 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 revesls that the cosmological term does not change its fundamental nature for ε =const and ε =ε(t),where ε is the coefficient of bulk viscosity.The A(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.