New Agegraphic Dark Energy in Brans-Dicke Theory
Abstract
In this paper, we investigate the new agegraphic dark energy model in the framework of Brans-Dicke theory which is a natural extension of the Einstein's general relativity. In this framework the form of the new agegraphic dark energy density takes as , where is the conformal age of the universe and is the Brans-Dicke scalar field representing the inverse of the time-variable Newton's constant. We derive the equation of state of the new agegraphic dark energy and the deceleration parameter of the universe in the Brans-Dicke theory. It is very interesting to find that in the Brans-Dicke theory the agegraphic dark energy realizes quintom-like behavior, i.e., its equation of state crosses the phantom divide during the evolution. We also compare the situation of the agegraphic dark energy model in the Brans-Dicke theory with that in the Einstein's theory. In addition, we discuss the new agegraphic dark energy model with interaction in the framework of the Brans-Dicke theory.
Keywords
Cite
@article{arxiv.0909.4911,
title = {New Agegraphic Dark Energy in Brans-Dicke Theory},
author = {Xiang-Lai Liu and Xin Zhang},
journal= {arXiv preprint arXiv:0909.4911},
year = {2014}
}
Comments
15 pages, 4 figures