In this paper,we investigate the new agegraphic dark energy model in the framework of Brans-Dicketheory,which is a natural extension of the Einstein's general relativity.In this framework the form of the new agegr...In this paper,we investigate the new agegraphic dark energy model in the framework of Brans-Dicketheory,which is a natural extension of the Einstein's general relativity.In this framework the form of the new agegraphicdark energy density takes as ρ_q=3n^2φ(t)η^(-2),where η is the conformal age of the universe and φ(t)is the Brans-Dickescalar field representing the inverse of the time-variable Newton's constant.We derive the equation of state of the newagegraphic dark energy and the deceleration parameter of the universe in the Brans-Dicke theory.It is very interestingto find that in the Brans-Dicke theory the agegraphic dark energy realizes quintom-like behavior,i.e.,its equation ofstate crosses the phantom divide w=-1 during the evolution.We also compare the situation of the agegraphic darkenergy model in the Brans-Dicke theory with that in the Einstein's theory.In addition,we discuss the new agegraphicdark energy model with interaction in the framework of the Brans-Dicke theory.展开更多
基金Supported by the National Natural Science Foundation of China under Grant No.10705041
文摘In this paper,we investigate the new agegraphic dark energy model in the framework of Brans-Dicketheory,which is a natural extension of the Einstein's general relativity.In this framework the form of the new agegraphicdark energy density takes as ρ_q=3n^2φ(t)η^(-2),where η is the conformal age of the universe and φ(t)is the Brans-Dickescalar field representing the inverse of the time-variable Newton's constant.We derive the equation of state of the newagegraphic dark energy and the deceleration parameter of the universe in the Brans-Dicke theory.It is very interestingto find that in the Brans-Dicke theory the agegraphic dark energy realizes quintom-like behavior,i.e.,its equation ofstate crosses the phantom divide w=-1 during the evolution.We also compare the situation of the agegraphic darkenergy model in the Brans-Dicke theory with that in the Einstein's theory.In addition,we discuss the new agegraphicdark energy model with interaction in the framework of the Brans-Dicke theory.
