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29 March 2024
 
  » arxiv » 1104.2948

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The WiggleZ Dark Energy Survey: the growth rate of cosmic structure since redshift z=0.9
Chris Blake ; Sarah Brough ; Matthew Colless ; Carlos Contreras ; Warrick Couch ; Scott Croom ; Tamara Davis ; Michael J. Drinkwater ; Karl Forster ; David Gilbank ; Mike Gladders ; Karl Glazebrook ; Ben Jelliffe ; Russell J. Jurek ; I-hui Li ; Barry Madore ; Chris Martin ; Kevin Pimbblet ; Gregory Poole ; Michael Pracy ; Rob Sharp ; Emily Wisnioski ; David Woods ; Ted Wyder ; Howard Yee ;
Date 15 Apr 2011
AbstractWe present precise measurements of the growth rate of cosmic structure for the redshift range 0.1 < z < 0.9, using redshift-space distortions in the galaxy power spectrum of the WiggleZ Dark Energy Survey. Our results, which have a precision of around 10% in four independent redshift bins, are well-fit by a flat LCDM cosmological model with matter density parameter Omega_m = 0.27. Our analysis hence indicates that this model provides a self-consistent description of the growth of cosmic structure through large-scale perturbations and the homogeneous cosmic expansion mapped by supernovae and baryon acoustic oscillations. We achieve robust results by systematically comparing our data with several different models of the quasi-linear growth of structure including empirical models, fitting formulae calibrated to N-body simulations, and perturbation theory techniques. We extract the first measurements of the power spectrum of the velocity divergence field, P_vv(k), as a function of redshift (under the assumption that P_gv(k) = -sqrt[P_gg(k) P_vv(k)] where g is the galaxy overdensity field), and demonstrate that the WiggleZ galaxy-mass cross-correlation is consistent with a deterministic (rather than stochastic) scale-independent bias model for WiggleZ galaxies for scales k < 0.3 h/Mpc. Measurements of the cosmic growth rate from the WiggleZ Survey and other current and future observations offer a powerful test of the physical nature of dark energy that is complementary to distance-redshift measures such as supernovae and baryon acoustic oscillations.
Source arXiv, 1104.2948
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