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The WiggleZ Dark Energy Survey: Joint measurements of the expansion and growth history at z < 1 | | Chris Blake
; Sarah Brough
; Matthew Colless
; Carlos Contreras
; Warrick Couch
; Scott Croom
; Darren Croton
; 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 B. Poole
; Michael Pracy
; Rob Sharp
; Emily Wisnioski
; David Woods
; Ted Wyder
; Howard Yee
; | | Date: |
17 Apr 2012 | | Abstract: | We perform a joint determination of the distance-redshift relation and cosmic
expansion rate at redshifts z = 0.44, 0.6 and 0.73 by combining measurements of
the baryon acoustic peak and Alcock-Paczynski distortion from galaxy clustering
in the WiggleZ Dark Energy Survey, using a large ensemble of mock catalogues to
calculate the covariance between the measurements. Further combining our
results with other baryon acoustic oscillation and distant supernovae datasets,
we use a Monte Carlo Markov Chain technique to determine the evolution of the
Hubble parameter H(z) as a stepwise function in 9 redshift bins of width dz =
0.1, also marginalizing over the spatial curvature. Our measurements of H(z),
which have precision better than 7% in most redshift bins, are consistent with
the expansion history predicted by a cosmological-constant dark-energy model,
in which the expansion accelerates at redshift z < 0.7. We also measure the
normalized cosmic growth rate at z = 0.44, 0.6 and 0.73, together with its
covariance with the expansion history, using redshift-space distortions in the
WiggleZ Survey dataset. The measured growth rate is consistent with the same
cosmological-constant model that describes the expansion history. | | Source: | arXiv, 1204.3674 | | Services: | Forum | Review | PDF | Favorites | |
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