Phenomenology of $Λ$-CDM model: a possibility of accelerating Universe with positive pressure

Details Phenomenology of $Λ$-CDM model: a possibility of accelerating Universe with positive pressure Phenomenology of $Λ$-CDM model: a possibility of accelerating Universe with positive pressure

2007-11-05

arxiv.org/abs/0711.0686v3

Int.J.Theor.Phys.50:939-951,2011

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

16 Latex pages, 11 figures, Considerable modifications in the text; Accepted in IJTP

Scientific paper

10.1007/s10773-010-0639-0

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.

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