Dark Energy Models With Variable Equation Of State Parameter

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Mukhopadhyay, Utpal
Ray, Saibal
Rahaman, Farook
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Abstract
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Two variable $\Lambda$ models, viz. $\Lambda \sim (\dot a/a)^2$ and $\Lambda \sim \rho$ have been studied under the assumption that the equation of state parameter $\omega$ is a function of time. The selected $\Lambda$ models are found to be equivalent both in four and five dimensions. The possibility of signature flip of the deceleration parameter is also shown.
Comment: 15 Latex pages, a few changes in the text. Accepted in IJMPD
Keywords
General Relativity and Quantum Cosmology
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