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Phenomenology of Λ-CDM Model: A Possibility of Accelerating Universe with Positive Pressure
Ray S., Khlopov M.Y., Ghosh P.P., Mukhopadhyay U.
International Journal of Theoretical Physics 50 (2011) 939-951 - http://hal.in2p3.fr/in2p3-00193780
Physique/Relativité Générale et Cosmologie Quantique
Phenomenology of Λ-CDM Model: A Possibility of Accelerating Universe with Positive Pressure
S. Ray, M.Y. Khlopov1, 2, P.P. Ghosh, U. Mukhopadhyay
1 :  APC - UMR 7164 - AstroParticule et Cosmologie
http://www.apc.univ-paris7.fr/
CNRS : UMR7164 – IN2P3 – Observatoire de Paris – Université Paris VII - Paris Diderot – CEA : DSM/IRFU
APC - UMR 7164, Université Paris Diderot, 10 rue Alice Domon et Léonie Duquet, case postale 7020, F-75205 Paris Cedex 13
France
2 :  Center for cosmoparticle physics "Cosmion" - Center for cosmoparticle physics "Cosmion"
Keldysh Institute of Applied Mathematics of Russian Academy of Sciences
Miusskaya Pl. 4, Moscow, 125047, Russia
Russie, Fédération De
APC - THEORIE
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.

Articles dans des revues avec comité de lecture
2011
International Journal of Theoretical Physics (Int. J. Theor. Phys.)
Publisher Springer Verlag (Germany)
ISSN 0020-7748 (eISSN : 1572-9575)
50
939-951
(c) 2011: Springer Science+Business Media, LLC

11 Latex page
General relativity – Dark energy – Variable Λ
Lien vers le texte intégral : 
http://fr.arXiv.org/abs/0711.0686