Physics – General Physics
Scientific paper
2010-10-08
Physics
General Physics
11 pages, 5 figures
Scientific paper
The special law of variation for average Hubble's parameter proposed by Kumar and Singh (2007) in Bianchi-I space-time yields constant value of deceleration parameter given by q = n-1, which provides accelerating models of the universe for n < 1 and decelerating ones for n > 1. In the present work, we have emphasized that decelerating models can be described by the usual perfect fluid, while dynamics of accelerating universe can be described by considering some exotic type of matter such as the dark energy. We have investigated the role of dark energy with variable equation of state parameter in the evolution of universe within the framework of a spatially homogeneous Bianchi-I space-time by taking into account the special law of variation for the average Hubble's parameter. Dark energy cosmologies have been discussed in two different cases, viz., power-law (n \neq 0) and exponential-law (n = 0). The analysis of the models reveals that the present-day universe is dominated by dark energy, which can successfully describe the accelerating nature of the universe consistent with the observations. The isotropy and flatness of the universe turn out to be natural consequences of dark energy.
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