Holographic dark energy in Brans-Dicke cosmology with chameleon scalar field

Details Holographic dark energy in Brans-Dicke cosmology with chameleon scalar field Holographic dark energy in Brans-Dicke cosmology with chameleon scalar field

2010-06-02

arxiv.org/abs/1006.0658v1

Phys.Lett.B690:1-4,2010

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

8 pages, no figure

Scientific paper

10.1016/j.physletb.2010.05.002

We study a cosmological implication of holographic dark energy in the Brans-Dicke gravity. We employ the holographic model of dark energy to obtain the equation of state for the holographic energy density in non-flat (closed) universe enclosed by the event horizon measured from the sphere of horizon named $L$. Our analysis shows that one can obtain the phantom crossing scenario if the model parameter $\alpha$ (of order unity) is tuned accordingly. Moreover, this behavior is achieved by treating the Brans-Dicke scalar field as a Chameleon scalar field and taking a non-minimal coupling of the scalar field with matter. Hence one can generate phantom-like equation of state from a holographic dark energy model in non-flat universe in the Brans-Dicke cosmology framework.

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