Astronomy and Astrophysics – Astrophysics
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011ap%26ss.333..343p&link_type=abstract
Astrophysics and Space Science, Volume 333, Issue 1, pp.343-350
Astronomy and Astrophysics
Astrophysics
3
Frw Universe, Dark Energy, Constant Deceleration Parameter
Scientific paper
In this paper we study the evolution of the dark energy parameter within the scope of a spatially homogeneous and isotropic FRW universe filled with barotropic fluid and dark energy. The scale factor is considered as a power law function of time which yields a constant deceleration parameter. We consider the case when the dark energy is minimally coupled to the perfect fluid as well as direct interaction with it. The cosmic jerk parameter in our derived models is consistent with the recent data of astrophysical observations. It is concluded that in non-interacting case, all the three open, close and flat universes cross the phantom region whereas in interacting case only open and flat universes cross the phantom region. We find that during the evolution of the universe, the equation of state (EoS) for dark energy ω D changes from ω D >-1 to ω D <-1, which is consistent with recent observations.
Amirhashchi Hassan
Pradhan Anirudh
Saha Bijan
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