The WiggleZ Dark Energy Survey: the growth rate of cosmic structure since redshift z=0.9

摘要: We present precise measurements of the growth rate cosmic structure for redshift range 0.1 < z 0.9, using redshift-space distortions in galaxy power spectrum WiggleZ Dark Energy Survey. Our results, which have a precision around 10 per cent four independent bins, are well fitted by flat Λ cold dark matter (ΛCDM) cosmological model with density parameter Ω_m = 0.27. analysis hence indicates that this provides self-consistent description through large-scale perturbations and homogeneous expansion mapped supernovae baryon acoustic oscillations. achieve robust results systematically comparing our data with several different models quasi-linear including empirical models, fitting formulae calibrated to N-body simulations, perturbation theory techniques. extract first velocity divergence field, P_(θθ) (k), as function (under assumption P_(gθ) (k) − √P_(gg)(k)P_(θθ) (k), where g is overdensity field), demonstrate galaxy–mass cross-correlation consistent deterministic (rather than stochastic) scale-independent bias galaxies scales k 0.3 h Mpc^(−1). Measurements from the Survey other current future observations offer powerful test physical nature energy complementary distance–redshift measures such as