English

Testing Late Time Cosmic Acceleration with uncorrelated Baryon Acoustic Oscillations dataset

Cosmology and Nongalactic Astrophysics 2021-03-10 v2 Astrophysics of Galaxies General Relativity and Quantum Cosmology High Energy Physics - Phenomenology

Abstract

Baryon Acoustic Oscillations (BAO) involve measuring the spatial distribution of galaxies to determine the growth rate of cosmic structure. We derive constraints on cosmological parameters from 1717 uncorrelated BAO measurements that were collected from 333333 published data points in the effective redshift range 0.106z2.360.106 \leq z \leq 2.36. We test the correlation of the subset using random covariance matrix. The Λ\LambdaCDM model fit yields the cosmological parameters: Ωm=0.261±0.028\Omega_m = 0.261 \pm 0.028 and ΩΛ=0.733±0.021\Omega_\Lambda = 0.733 \pm 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±1.27km/sec/Mpc 69.85 \pm 1.27 km/sec/Mpc and the sound horizon distance gives: 146.1±2.15Mpc 146.1 \pm 2.15 Mpc. Beyond the Λ\LambdaCDM model we test ΩK\Omega_KCDM and wCDM. The spatial curvature is Ωk=0.076±0.012\Omega_k = -0.076 \pm 0.012 and the dark energy equation of states: w=0.989±0.049w = -0.989 \pm 0.049. {We perform AIC test to compare the 3 models and see that Λ\LambdaCDM scores best.

Keywords

Cite

@article{arxiv.2009.10701,
  title  = {Testing Late Time Cosmic Acceleration with uncorrelated Baryon Acoustic Oscillations dataset},
  author = {David Benisty and Denitsa Staicova},
  journal= {arXiv preprint arXiv:2009.10701},
  year   = {2021}
}

Comments

8 pages; Accepted in Astronomy and Astrophysics