Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2010-10-27
Eur.Phys.J.C71:1585,2011
Physics
High Energy Physics
High Energy Physics - Theory
23 pages, 7 figures
Scientific paper
10.1140/epjc/s10052-011-1585-6
We investigate the Brans-Dicke (BD) theory with the potential as cosmological model to explain the present accelerating universe. In this work, we consider the BD field as a perfect fluid with the energy density and pressure in the Jordan frame. Introducing the power-law potential and the interaction with the cold dark matter, we obtain the phantom divide which is confirmed by the native and effective equation of state. Also we can describe the metric $f(R)$ gravity with an appropriate potential, which shows a future crossing of phantom divide in viable $f(R)$ gravity models when employing the native and effective equations of state.
Kim Kyoung Yee
Lee Hyung Won
Myung Yun Soo
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