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

David Benisty, Denitsa Staicova

Research output: Contribution to journalArticlepeer-review

52 Scopus citations

Abstract

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 -cold dark matter (CDM) model fit yields the cosmological parameters m = 0:261 -0:028 and -= 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 CDM model we test kCDM and wCDM. The spatial curvature is 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-CDM scores best.

Original languageEnglish
Article numberA38
JournalAstronomy and Astrophysics
Volume647
DOIs
StatePublished - 1 Mar 2021

Keywords

  • Astronomical databases: miscellaneous
  • Cosmological parameters
  • Methods: data analysis

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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