Degeneracy and discreteness in cosmological model fitting

作     者：Huan-Yu Teng Yuan Huang Tong-Jie Zhang 

作者机构：Department of AstronomyBeijing Normal UniversityBeijing 100875China Departments of Physics and AstronomyUniversity of CaliforniaBerkeleyCA 94720USA Lawrence Berkeley National Laboratory1 Cyclotron RoadBerkeleyCA 94720USA 

出 版 物：《Research in Astronomy and Astrophysics》 (天文和天体物理学研究（英文版）)

年 卷 期：2016年第16卷第3期

页      面：121-128页

核心收录：

学科分类：081702[工学-化学工艺] 07[理学] 08[工学] 0817[工学-化学工程与技术] 070401[理学-天体物理] 0704[理学-天文学] 

基　　金：supported by the National Natural Science Foundation of China(Grant No.11173006) the National Basic Research Program of China(project 973,No.2012CB821804) 

主　　题：cosmological parameters    cosmology: observations    methods: statistical 

摘      要：We explore the problems of degeneracy and discreteness in the standard cosmological model（ΛCDM）. We use the Observational Hubble Data（OHD） and the type Ia supernovae（SNe Ia） data to study this issue. In order to describe the discreteness in fitting of data, we define a factor G to test the influence from each single data point and analyze the goodness of G. Our results indicate that a higher absolute value of G shows a better capability of distinguishing models, which means the parameters are restricted into smaller confidence intervals with a larger figure of merit evaluation. Consequently, we claim that the factor G is an effective way of model differentiation when using different models to fit the observational data.