Holographic dark energy in Brans-Dicke cosmology with chameleon scalar field. (arXiv:1006.0658v1 [gr-qc])

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.

hep-th updates on arXiv.org