Testing Late Time Cosmic Acceleration with uncorrelated Baryon Acoustic Oscillations dataset

2020-09-22 2020-12-15

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 $17$ uncorrelated BAO measurements that were collected from $333$ published data points in the effective redshift range $0.106 \leq z \leq 2.36$. We test the correlation of the subset using random covariance matrix. The $\Lambda$CDM model fit yields the cosmological parameters: $\Omega_m = 0.261 \pm 0.028$ and $\Omega_\Lambda = 0.733 \pm 0.021$. 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 \pm 1.27 km/sec/Mpc$ and the sound horizon distance gives: $ 146.1 \pm 2.15 Mpc$. Beyond the $\Lambda$CDM model we test $\Omega_K$CDM and wCDM. The spatial curvature is $\Omega_k = -0.076 \pm 0.012$ and the dark energy equation of states: $w = -0.989 \pm 0.049$. {We perform AIC test to compare the 3 models and see that $\Lambda$CDM scores best.
Comment: 8 pages; Accepted in Astronomy and Astrophysics

Astrophysics - Cosmology and Nongalactic Astrophysics; Astrophysics - Astrophysics of Galaxies; General Relativity and Quantum Cosmology; High Energy Physics - Phenomenology; text

10.1051.0004-6361.202039502

Open access content. Open access content

COO oai:arXiv.org:2009.10701
A&A 647, A38 (2021)
doi:10.1051/0004-6361/202039502
1246607906

CORNELL UNIV
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