Day 1155

Tuesday.

1609.05476
Cosmological constraints from the redshift dependence of the Alcock-Paczynski effect: application to the SDSS-III BOSS DR12 galaxies
Li, et al

Apply the methodology developed in Li 2014, 2015 to BOSS DR12 galaxies and derive cosmo constraints from the redshift dependence of the AP effect.  The apparent anisotropy in distribution of observed galaxies arise from two main sources, RSD due to galaxy peculiar velocities, and the geometric distortion when incorrect cosmological models are assumed for transforming redshift to comoving distance, known as the AP effect.  Anisotropies produced by RSD are, although large, maintains a nearly uniform magnitude over a large range of redshift, while the degree of anisotropies from the AP effect varies with redshift by much larger magnitude.  Split the DR12 galaxies into 6 z bins, measure the 2pt correlation function in each bin, and assess the redshift evolution of anisotropies.  Obtain constraints of Omega_m=0.290±0.053, w=-1.07±0.15, which are comparable with the current constraints from other cosmo probes such as SNe Ia, CMB, and BAO.  Combining these cosmo probes with this method yield tight constraints for Omega_m=0.301±0.006, w=-1.054±0.025.  This method is complementary to the other LSS probes like BAO and topology.  Expect this technique will play an important role in deriving cosmo constraints from LSS surveys.