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
Institut für theoretische Physik, APC - UMR 7164 - AstroParticule et Cosmologie
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.
Type de document :
Article dans une revue
International Journal of Theoretical Physics, Springer Verlag, 2011, 50, pp.939-951. <10.1007/s10773-010-0639-0>


http://hal.in2p3.fr/in2p3-00193780
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Soumis le : mardi 4 décembre 2007 - 15:44:04
Dernière modification le : mardi 11 octobre 2016 - 14:55:44

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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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