Testing modified gravity models with recent cosmological observations  

作　　者：ZHANG WenShuai CHENG Cheng HUANG QingGuo LI Miao LI Song LI XiaoDong WANG Shuang 

机构地区：[1]Department of Modern Physics,University of Science and Technology of China,Hefei 230026,China [2]Institute of Theoretical Physics,Chinese Academy of Sciences,Beijing 100190,China [3]Kavli Institute for Theoretical Physics China,Chinese Academy of Sciences,Beijing 100190,China [4]State Key Laboratory of Theoretical Physics,Chinese Academy of Sciences,Beijing 100190,China [5]Interdisciplinary Center for Theoretical Study,University of Science and Technology of China,Hefei 230026,China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2012年第12期2244-2258,共15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. 10535060/A050207,10821504 and 10975167);the Project of Knowledge Innovation Program of Chinese Academy of Science

摘　　要：We explore the cosmological implications of five modified gravity(MG) models by using the recent cosmological observational data,including the recently released SNLS3 type Ia supernovae sample,the cosmic microwave background anisotropy data from the Wilkinson Microwave Anisotropy Probe 7-yr observations,the baryon acoustic oscillation results from the Sloan Digital Sky Survey data release 7,and the latest Hubble constant measurement utilizing the Wide Field Camera 3 on the Hubble Space Telescope.The MG models considered include the Dvali-Gabadadze-Porrati(DGP) model,two f(R) models,and two f(T) models.We find that compared with the ΛCDM model,MG models can not lead to an appreciable reduction of the χ 2 min.The analysis of AIC and BIC shows that the simplest cosmological constant model(ΛCDM) is still the most preferred by the current data,and the DGP model is strongly disfavored.In addition,from the observational constraints,we also reconstruct the evolutions of the growth factor in these models.We find that the current available growth factor data are not enough to distinguish these MG models from the ΛCDM model.We explore the cosmological implications of five modified gravity（MG） models by using the recent cosmological observational data,including the recently released SNLS3 type Ia supernovae sample,the cosmic microwave background anisotropy data from the Wilkinson Microwave Anisotropy Probe 7-yr observations,the baryon acoustic oscillation results from the Sloan Digital Sky Survey data release 7,and the latest Hubble constant measurement utilizing the Wide Field Camera 3 on the Hubble Space Telescope.The MG models considered include the Dvali-Gabadadze-Porrati（DGP） model,two f（R） models,and two f（T） models.We find that compared with the ΛCDM model,MG models can not lead to an appreciable reduction of the χ 2 min.The analysis of AIC and BIC shows that the simplest cosmological constant model（ΛCDM） is still the most preferred by the current data,and the DGP model is strongly disfavored.In addition,from the observational constraints,we also reconstruct the evolutions of the growth factor in these models.We find that the current available growth factor data are not enough to distinguish these MG models from the ΛCDM model.

关 键 词：modified gravity cosmic acceleration dark energy experiment growth factor 

分 类 号：P159[天文地球—天文学]