| Thème(s) : |
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Physique/Relativité Générale et Cosmologie Quantique
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| Titre : |
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Phenomenology of Λ-CDM Model: A Possibility of Accelerating Universe with Positive Pressure |
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| Auteur : |
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S. Ray, M.Y. Khlopov1, 2, P.P. Ghosh, U. Mukhopadhyay |
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| Laboratoire : |
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| équipe(s) de recherche : |
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APC - THEORIE |
| Résumé : |
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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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| Type de publication : |
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Articles dans des revues avec comité de lecture |
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Date de publication
ou d'écriture : |
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2011 |
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| Nom du périodique : |
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| International Journal of Theoretical Physics (Int. J. Theor. Phys.) |
| Publisher |
Springer Verlag (Germany) |
| ISSN |
0020-7748 (eISSN : 1572-9575) |
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| Volume : |
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50 |
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| Page/Article : |
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939-951 |
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| Copyright : |
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(c) 2011: Springer Science+Business Media, LLC |
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| Commentaire : |
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11 Latex page |
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| Mot(s)-clé(s) : |
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General relativity – Dark energy – Variable Λ |
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