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General Relativity and Quantum Cosmology

arXiv:0711.0686 (gr-qc)
[Submitted on 5 Nov 2007 (v1), last revised 14 Dec 2010 (this version, v3)]

Title:Phenomenology of $Λ$-CDM model: a possibility of accelerating Universe with positive pressure

Authors:Saibal Ray, Maxim Khlopov, Utpal Mukhopadhyay, Partha Pratim Ghosh
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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.
Comments: 16 Latex pages, 11 figures, Considerable modifications in the text; Accepted in IJTP
Subjects: General Relativity and Quantum Cosmology (gr-qc); Cosmology and Nongalactic Astrophysics (astro-ph.CO)
Cite as: arXiv:0711.0686 [gr-qc]
  (or arXiv:0711.0686v3 [gr-qc] for this version)
  https://doi.org/10.48550/arXiv.0711.0686
Journal reference: Int.J.Theor.Phys.50:939-951,2011
Related DOI: https://doi.org/10.1007/s10773-010-0639-0

Submission history

From: Saibal Ray [view email]
[v1] Mon, 5 Nov 2007 16:42:51 UTC (24 KB)
[v2] Sat, 17 Jul 2010 07:40:08 UTC (23 KB)
[v3] Tue, 14 Dec 2010 07:00:31 UTC (1,492 KB)
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