Vol 16, No 3

Degeneracy and discreteness in cosmological model fitting

Huan-Yu Teng, Yuan Huang, Tong-Jie Zhang


Abstract 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 ς to test the influence from each single data point and analyze the goodness of ς . Our results indicate that a higher absolute value of ς 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 ς is an effective way of model differentiation when using different models to fit the observational data.


Keywords cosmological parameters — cosmology: observations — methods: statistical

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