The clustering of galaxies in the SDSS-III Baryon Oscillation Spectroscopic Survey: Measuring growth rate and geometry with anisotropic clustering

摘要: We use the observed anisotropic clustering of galaxies in Baryon Oscillation Spectroscopic Survey Data Release 11 CMASS sample to measure linear growth rate structure, Hubble expansion and comoving distance scale. Our covers 8498 deg2 encloses an effective volume 6 Gpc3 at redshift z¯=0.57. find fσ8 = 0.441 ± 0.044, H 93.1 3.0 km s−1 Mpc−1 DA 1380 23 Mpc when fitting simultaneously. When we fix background one predicted by spatially flat Λ cold dark matter (ΛCDM) model agreement with recent Planck results, 0.447 0.028 (6 per cent accuracy). While our measurements are generally consistent predictions ΛCDM general relativity, they mildly favour models which strength gravitational interactions is weaker than what relativity. Combining cosmic microwave data results tight constraints on basic cosmological parameters deviations from standard model. Separately varying these parameters, w −0.983 0.075 (8 accuracy) γ 0.69 0.11 (16 for equation state energy index, respectively. Both good values −1 0.554.