Testing late-time cosmic acceleration with uncorrelated baryon acoustic oscillation dataset

Baryon acoustic oscillations (BAO) involve measuring the spatial distribution of galaxies to determine the growth rate of cosmic structures. We derive constraints on cosmological parameters from 17 uncorrelated BAO measurements that were collected from 333 published data points in the effective redshift range 0.106 <= z <= 2.36. We test the correlation of the subset using a random covariance matrix. The Lambda cold dark matter (Lambda CDM) model fit yields the cosmological parameters Omega(m)=0.261 +/- 0.028 and Omega(Lambda)=0.733 +/- 0.021. Combining the BAO data with the Cosmic Chronometers data, the Pantheon type Ia supernova, and the Hubble diagram of gamma-ray bursts and quasars, the Hubble constant yields 69.85 +/- 1.27 km s(-1) Mpc(-1) and the sound horizon distance gives 146.1 +/- 2.15 Mpc. Beyond the Lambda CDM model we test Omega kCDM and wCDM. The spatial curvature is Omega(k)=-0.076 +/- 0.012 and the dark energy equation of states is w=-0.989 +/- 0.049. We perform the Akaike information criteria test to compare the three models, and see that Lambda CDM scores best.

Automated summary

By measuring the spatial distribution of galaxies and combining various data sets, this study derived constraints on cosmological parameters, confirming the accuracy of the ΛCDM model as the best fit.