$Λ$-CDM Universe: A Phenomenological Approach With Many Possibilities

Details $Λ$-CDM Universe: A Phenomenological Approach With Many Possibilities $Λ$-CDM Universe: A Phenomenological Approach With Many Possibilities

2007-08-05

arxiv.org/abs/0708.0680v2

Int.J.Mod.Phys.D17:301-309,2008

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

10 Latex pages; Corrected typos; To appear in Int. J. Mod. Phys. D

Scientific paper

10.1142/S0218271808012012

A time-dependent phenomenological model of $\Lambda$, viz. $\dot \Lambda\sim H^3$ is selected to investigate the $\Lambda$-CDM cosmology. Time-dependent form of the equation of state parameter $\omega$ is derived and it has been possible to obtain the sought for flip of sign of the deceleration parameter q. Present age of the Universe, calculated for some specific values of the parameters agrees very well with the observational data.

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