Cosmological constraints from Radial Baryon Acoustic Oscillation measurements and Observational Hubble data

TL;DR

This study combines Radial Baryon Acoustic Oscillation measurements, supernovae, Hubble data, and CMB data to constrain cosmological models, finding consistent results and highlighting the potential of Hubble data for future constraints.

Contribution

It demonstrates the effectiveness of combining multiple observational datasets to constrain cosmological parameters and explores the potential of observational H(z) data as an alternative to supernovae.

Findings

Confidence regions from combined data are consistent across models.

OHD data can potentially replace SNe Ia in future constraints.

Results align with previous studies, confirming data compatibility.

Abstract

We use the Radial Baryon Acoustic Oscillation (RBAO) measurements, distant type Ia supernovae (SNe Ia), the observational $H(z)$ data (OHD) and the Cosmic Microwave Background (CMB) shift parameter data to constrain cosmological parameters of $\Lambda$CDM and XCDM cosmologies and further examine the role of OHD and SNe Ia data in cosmological constraints. We marginalize the likelihood function over $h$ by integrating the probability density $P\propto e^{-\chi^{2}/2}$ to obtain the best fitting results and the confidence regions in the $\Omega_{m}-\Omega_{\Lambda}$ plane.With the combination analysis for both of the {\rm $\Lambda$}CDM and XCDM models, we find that the confidence regions of 68.3%, 95.4% and 99.7% levels using OHD+RBAO+CMB data are in good agreement with that of SNe Ia+RBAO+CMB data which is consistent with the result of Lin et al's work. With more data of OHD, we can probably constrain the cosmological parameters using OHD data instead of SNe Ia data in the future.