Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2009-07-31
Phys.Lett.B681:205-209,2009
Physics
High Energy Physics
High Energy Physics - Theory
13 pages, new version, to appear in Phys. Lett. B
Scientific paper
10.1016/j.physletb.2009.10.011
We study cosmological application of interacting holographic energy density in the framework of Brans-Dicke cosmology. We obtain the equation of state and the deceleration parameter of the holographic dark energy in a non-flat universe. As system's IR cutoff we choose the radius of the event horizon measured on the sphere of the horizon, defined as $L=ar(t)$. We find that the combination of Brans-Dicke field and holographic dark energy can accommodate $w_D = -1 $ crossing for the equation of state of \textit{noninteracting} holographic dark energy. When an interaction between dark energy and dark matter is taken into account, the transition of $w_D$ to phantom regime can be more easily accounted for than when resort to the Einstein field equations is made.
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