Model-independent measurements of cosmic expansion and growth at z = 0.57 using the anisotropic clustering of CMASS galaxies from the Sloan Digital Sky Survey Data Release 9

We analyze the anisotropic two dimensional galaxy correlation function (2DCF) of the CMASS galaxy samples from the Sloan Digital Sky Survey Data Release 9 (DR9) of the Baryon Oscillation Spectroscopic Survey (BOSS) data. Modeling the 2DCF fully includ-ing nonlinear effects and redshift space distortions (RSD) in the scale range of 30 to 120 h−1Mpc, we find H(0.57)rs(zd)/c = 0.0444 ± 0.0019, DA(0.57)/rs(zd) = 9.01 ± 0.23, and fg(0.57)σ8(0.57) = 0.474 ± 0.075, where rs(zd) is the sound horizon at the drag epoch computed using a simple integral, and fg(z) is the growth rate at redshift z, and σ8(z) repre-sents the matter power spectrum normalization on 8h−1Mpc scale at z. We find that the scales larger than 120 h−1Mpc are dominated by noise in the 2DCF analysis, and that the inclusion of scales 30-40 h−1Mpc significantly tightens the RSD measurement. Our measurements are consistent with previous results using the same data, but have significantly better precision since we are using all the information from the 2DCF in the scale range of 30 to 120 h−1Mpc. Our measurements have been marginalized over sufficiently wide priors for the relevant pa-rameters; they can be combined with other data to probe dark energy and gravity.