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International Journal of Theoretical Physics 50 (2011) 939-951
Phenomenology of Λ-CDM Model: A Possibility of Accelerating Universe with Positive Pressure
S. Ray, M.Y. Khlopov1, 2, P.P. Ghosh, U. Mukhopadhyay

Among various phenomenological $\Lambda$ models, a time-dependent model $\dot \Lambda\sim H^3$ is selected here to investigate the $\Lambda$-CDM cosmology. Using this model the expressions for the time-dependent equation of state parameter $\omega$ and other physical parameters are derived. It is shown that in $H^3$ model accelerated expansion of the Universe takes place at negative energy density, but with a positive pressure. It has also been possible to obtain the change of sign of the deceleration parameter $q$ during cosmic evolution.
1 :  APC - UMR 7164 - AstroParticule et Cosmologie
2 :  Center for cosmoparticle physics "Cosmion" - Center for cosmoparticle physics "Cosmion"
Physique/Relativité Générale et Cosmologie Quantique
General relativity – Dark energy – Variable Λ
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