159 articles – 2000 Notices  [english version]
 HAL : in2p3-00193780, version 1
 arXiv : 0711.0686
 International Journal of Theoretical Physics 50 (2011) 939-951
 Phenomenology of Λ-CDM Model: A Possibility of Accelerating Universe with Positive Pressure
 (2011)
 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.
 équipe(s) de recherche : APC - THEORIE
 Thème(s) : Physique/Relativité Générale et Cosmologie Quantique
 Mot(s)-clé(s) : General relativity – Dark energy – Variable Λ
 Lien vers le texte intégral : http://fr.arXiv.org/abs/0711.0686
 in2p3-00193780, version 1 http://hal.in2p3.fr/in2p3-00193780 oai:hal.in2p3.fr:in2p3-00193780 Contributeur : Simone Lantz <> Soumis le : Mardi 4 Décembre 2007, 15:44:04 Dernière modification le : Mardi 28 Août 2012, 17:57:27