2017/09/30 by G. C. Carvalho, A. Bernui, M. Benetti +3 · 1 citation
Physics and Astronomy · #astro-ph.CO #gr-qc
paper · pdf · doi:10.1016/j.astropartphys.2020.102432
arxiv created 2019/08/14 · arxiv updated 2021/08/04
We report five measurements of the transverse baryonic acoustic scale, θBAO, obtained from the angular two-point correlation function calculation for Luminous Red Galaxies of the eleventh data release of the Sloan Digital Sky Survey (SDSS). Each measurement has been obtained by considering a thin redshift shell (δz = 0.01 and 0.02) in the interval z ∈ [0.565, 0.660] , which contains a large density of galaxies (∼ 20,000 galaxies/redshift shell). Differently from the three-dimensional Baryon Acoustic Oscillations (BAO) measurements, these data points are obtained almost model-independently and provide a Cosmic Microwave Background (CMB)-independent way to estimate the sound horizon rs . Assuming a time-dependent equation-of-state parameter for the dark energy, we also discuss constraints on the main cosmological parameters from θBAO and CMB data.