Phenomenology of Λ-CDM Model: A Possibility of Accelerating Universe with Positive Pressure - IN2P3 - Institut national de physique nucléaire et de physique des particules Access content directly
Journal Articles International Journal of Theoretical Physics Year : 2011

Phenomenology of Λ-CDM Model: A Possibility of Accelerating Universe with Positive Pressure

S. Ray
  • Function : Author
M.Y. Khlopov
  • Function : Author
P.P. Ghosh
  • Function : Author
U. Mukhopadhyay
  • Function : Author

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.

Dates and versions

in2p3-00193780 , version 1 (04-12-2007)

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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, 2011, 50, pp.939-951. ⟨10.1007/s10773-010-0639-0⟩. ⟨in2p3-00193780⟩
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