Study of baryon acoustic oscillations with SDSS DR12 data and measurement of Ω_\textrmDE(a)

2016/07/08 by B. Hoeneisen, Hoeneisen, B.
Physics and Astronomy · #Astrophysics and Cosmic Phenomena #Astrophysics of Galaxies (astro-ph.GA) #Cosmology and Gravitation Theories #Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #Galaxies: Formation, Evolution, Phenomena

paper · pdf · doi:10.48550/arxiv.1607.02424

openalex publication_date 2016/07/08 · openalex created_date 2016/09/16 · openalex updated_date 2026/07/28

Abstract

We define Baryon Acoustic Oscillation (BAO) distances d_α(z, z_c), d_z(z, z_c), and d_/(z, z_c) that do not depend on cosmological parameters. These BAO distances are measured as a function of redshift z with the Sloan Digital Sky Survey (SDSS) data release DR12. From these BAO distances alone, or together with the correlation angle θ_\textrmMC of the Cosmic Microwave Background (CMB), we constrain the cosmological parameters in several scenarios. We find 4.3 σ tension between the BAO plus θ_\textrmMC data and a cosmology with flat space and constant dark energy density Ω_\textrmDE(a). Releasing one and/or the other of these constraints obtains agreement with the data. We measure Ω_\textrmDE(a) as a function of a.

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