Interacting model of new agegraphic dark energy:observational constraints and age problem  

0Interacting model of new agegraphic dark energy:observational constraints and age problem

作　　者：LI YunHe MA JingZhe CUI JingLei WANG Zhuo ZHANG Xin 

机构地区：[1]Department of Physics, College of Sciences, Northeastern University, Shenyang 110004, China [2]Center for High Energy Physics, Peking University, Beijing 100080, China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2011年第8期1367-1377,共11页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.10705041 and 10975032);the National Ministry of Education of China under the innovation program for undergraduate students

摘　　要：Many dark energy models fail to pass the cosmic age test because of the old quasar APM 08279+5255 at redshift z=3.91,the ΛCDMmodel and holographic dark energy models being no exception.Inthis paper,we focus onthe topic of the age problem inthe new agegraphic dark energy(NADE)model.We determine the age of the universe in the NADE model by fitting the observational data,including type Ia supernovae(SNIa),baryon acoustic oscillations(BAO)and the cosmic microwave background(CMB).We find that the NADE model also faces the challenge of the age problem caused by the old quasar APM 08279+5255.In order to overcome such a difficulty,we consider the possible interaction between dark energy and dark matter.We show that this quasar can be successfully accommodated in the interacting new agegraphic dark energy(INADE)model at the 2σlevel under the current observational constraints.Many dark energy models fail to pass the cosmic age test because of the old quasar APM 08279＋5255 at redshift z=3.91,the ΛCDMmodel and holographic dark energy models being no exception.Inthis paper,we focus onthe topic of the age problem inthe new agegraphic dark energy（NADE）model.We determine the age of the universe in the NADE model by fitting the observational data,including type Ia supernovae（SNIa）,baryon acoustic oscillations（BAO）and the cosmic microwave background（CMB）.We find that the NADE model also faces the challenge of the age problem caused by the old quasar APM 08279＋5255.In order to overcome such a difficulty,we consider the possible interaction between dark energy and dark matter.We show that this quasar can be successfully accommodated in the interacting new agegraphic dark energy（INADE）model at the 2σlevel under the current observational constraints.

关 键 词：agegraphic dark energy interacting dark energy model observational constrains cosmic age problem 

分 类 号：P159[天文地球—天文学] P315.7