Interacting new agegraphic dark energy in non-flat Brans-Dicke cosmology

Abstract

We construct a cosmological model of late acceleration based on the new agegraphic dark energy model in the framework of Brans-Dicke cosmology where the new agegraphic energy density ${\rho }_D=3n^2{m}_p^2/{\eta }^2$ is replaced with ${\rho }_D=3n^2{\varphi }^2/(4\omega {\eta }^2$). We show that the combination of Brans-Dicke field and agegraphic dark energy can accommodate $w_D=-1$ crossing for the equation of state of \textit{noninteracting} 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. In the limiting case $\alpha =0$ $(\omega \to \infty )$, all previous results of the new agegraphic dark energy in Einstein gravity are restored.

9 pages. The version to appear in Phys. Rev. D

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