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Phenomenology of Λ-CDM Model: A Possibility of Accelerating Universe with Positive Pressure

S. Ray M.Y. Khlopov 1 P.P. Ghosh U. Mukhopadhyay 
1 APC - THEORIE
APC (UMR_7164) - AstroParticule et Cosmologie, Institut für theoretische Physik
Abstract : 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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http://hal.in2p3.fr/in2p3-00193780
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Submitted on : Tuesday, December 4, 2007 - 3:44:04 PM
Last modification on : Thursday, November 18, 2021 - 3:58:01 AM

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S. Ray, M.Y. Khlopov, P.P. Ghosh, U. Mukhopadhyay. Phenomenology of Λ-CDM Model: A Possibility of Accelerating Universe with Positive Pressure. International Journal of Theoretical Physics, Springer Verlag, 2011, 50, pp.939-951. ⟨10.1007/s10773-010-0639-0⟩. ⟨in2p3-00193780⟩

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