Degeneracy and discreteness in cosmological model fitting

• 来源期刊: 天文和天体物理学研究
• 年，卷（期）: 2016,（3）
• 页码范围: 121-128
• 页数: 8页
• 语种: 英文
• DOI: 10.1088/1674-4527/16/3/050

摘要

We explore the problems of degeneracy and discreteness in the standard cosmological model (ACDM).We use the Observational Hubble Data (OHD) and the type Ia supemovae (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.