Study of baryon acoustic oscillations with SDSS DR13 data and measurements of Ω_k and Ω_\textrmDE(a)

2016/12/13 by B. Hoeneisen, Hoeneisen, B.
Physics and Astronomy · #Astrophysics and Cosmic Phenomena #Astrophysics of Galaxies (astro-ph.GA) #Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #High-Energy Particle Collisions Research #Pulsars and Gravitational Waves Research

paper · pdf · doi:10.48550/arxiv.1612.04226

openalex publication_date 2016/12/13 · openalex created_date 2024/04/10 · openalex updated_date 2026/07/28

Abstract

We measure the baryon acoustic oscillation (BAO) observables d_α(z, z_c), d_z(z, z_c), and d_/(z, z_c) as a function of redshift z in the range 0.1 to 0.7 with Sloan Digital Sky Survey (SDSS) data release DR13. These observables are independent and satisfy a consistency relation that provides discrimination against miss-fits due to background fluctuations. From these measurements and the correlation angle θ_\textrmMC of fluctuations of the Cosmic Microwave Background (CMB) we obtain Ω_k = -0.015 ± 0.030, Ω_\textrmDE + 2.2 Ω_k = 0.717 ± 0.004 and w₁ = 0.37 ± 0.61 for dark energy density allowed to vary as Ω_\textrmDE(a) = Ω_\textrmDE [ 1 + w₁ ( 1 - a)]. We present measurements of Ω_\textrmDE(a) at six values of the expansion parameter a. Fits with several scenarios and data sets are presented. The data is consistent with space curvature parameter Ω_k = 0 and Ω_\textrmDE(a) constant.

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