Study of baryon acoustic oscillations with SDSS DR12 data and measurements of Ω_k and Ω_\textrmDE(a). Part II

2016/08/30 by Hoeneisen, B.
#Astrophysics of Galaxies (astro-ph.GA) #Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences

paper · doi:10.48550/arxiv.1608.08486

Abstract

We define Baryon Acoustic Oscillation (BAO) observables d_α(z, z_c), d_z(z, z_c), and d_/(z, z_c) that do not depend on any cosmological parameter. From each of these observables we recover the BAO correlation length d_\textrmBAO with its respective dependence on cosmological parameters. These BAO observables are measured as a function of redshift z with the Sloan Digital Sky Survey (SDSS) data release DR12. From the BAO measurements alone, or together with the correlation angle θ_\textrmMC of the Cosmic Microwave Background (CMB), we constrain the curvature parameter Ω_k and the dark energy density Ω_\textrmDE(a) as a function of the expansion parameter a in several scenarios. These observables are further constrained with external measurements of h and Ω_\textrmb h². We find some tension between the data and a cosmology with flat space and constant dark energy density Ω_\textrmDE(a).

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