New initial condition of the new agegraphic dark energy model

作     者：李云鹤 张敬飞 张鑫 

作者机构：Department of PhysicsCollege of SciencesNortheastern University 

出 版 物：《Chinese Physics B》 (中国物理B（英文版）)

年 卷 期：2013年第22卷第3期

页      面：561-566页

核心收录：

学科分类：07[理学] 070401[理学-天体物理] 0704[理学-天文学] 

基　　金：Project supported by the National Natural Science Foundation of China (Grant Nos. 10705041,10975032,11047112,and 11175042) the Program for New Century Excellent Talents at the University of Ministry of Education of China (Grant No. NCET-09-0276) the National Ministry of Education of China(Grant Nos. N100505001 and N110405011) 

主　　题：new agegraphic dark energy model initial condition single-parameter model observational constraints 

摘      要：The initial condition Ωde（zini）=n^2（1＋zini）^-2/4 at zini = 2000,widely used to solve the differential equation of the density of the new agegraphic dark energy（NADE） Ωde,makes the NADE model a single-parameter dark-energy cosmological ***,we find that this initial condition is only applicable in a flat universe with only dark energy and pressureless *** fact,in order to obtain more information from current observational data,such as the cosmic microwave background（CMB） and the baryon acoustic oscillations（BAO）,we need to consider the contribution of *** this situation,the initial condition mentioned above becomes *** overcome this shortcoming,we investigate the evolutions of dark energy in matter-dominated and radiation-dominated epochs,and obtain a new initial condition de（zini）=n2（1＋zini）-2（1＋F（zini））2/4 at z ini = 2000,where F（z）≡Ωr0（1＋z）/[Ωm0＋Ωr0（1＋z）] with Ωr0 and Ωm0 being the current density parameters of radiation and pressureless matter,*** revised initial condition is applicable for the differential equation of Ωde obtained in the standard Friedmann-Robertson-Walker（FRW） universe with dark energy,pressureless matter,radiation,and even spatial curvature,and can still keep the NADE model as a single-parameter *** the revised initial condition and the observational data of type Ia supernova（SNIa）,CMB,and BAO,we finally constrain the NADE *** results show that the single free parameter n of the NADE model can be constrained tightly.