Abstract
Motivated by the recent work of one of us Setare and Jamil (2010) [1], we generalize this work to the case where the pressureless dark matter and the holographic dark energy do not conserve separately but interact with each other. We investigate the cosmological applications of interacting holographic dark energy in Brans–Dicke theory with chameleon scalar field which is non-minimally coupled to the matter field. We find out that in this model the phantom crossing can be constructed if the model parameters are chosen suitably. We also perform the study for the new agegraphic dark energy model and calculate some relevant cosmological parameters and their evolution.
Highlights
Among various scenarios to explain the acceleration of the universe expansion, the holographic dark energy (HDE) and agegraphic dark energy (ADE) models have got a lot of enthusiasm recently
Combining Eqs. (27), (40) and (41) with Eq (38) we find the equation of state parameter of the interacting HDE
We have considered interacting HDE model in the framework of BD cosmology where the HDE density ρD = 3c2/(8πGL2) is replaced with ρD = 3c2φ/L2
Summary
Among various scenarios to explain the acceleration of the universe expansion, the holographic dark energy (HDE) and agegraphic dark energy (ADE) models have got a lot of enthusiasm recently. These models are originated from some considerations of the features of the quantum theory of gravity. The later (ADE) model assumes that the observed dark energy comes from the spacetime and matter field fluctuations in the universe. Where tp is the reduced Planck time and t is a proper time scale On these basis, Cai [9] proposed the energy density of the original ADE in the form. It differs from that of Ref. [1], in that we assume the pressureless dark matter and dark energy do not conserve separately but interact with each other, while the author of [1] assumes that the dark components do not interact with each other
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