Talk by Tamara Davis – University of Copenhagen

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Dark Cosmology Centre > Calendar DARK > Calendar 2013 > Talk by Tamara Davis

Talk by Tamara Davis

DARK's affiliated scientist, Tamara Davis, will give a talk entitled The WiggleZ Dark Energy Survey - Final Results at 11:15 Thursday 13 June 2013.

Abstract:
The WiggleZ Dark Energy Survey - Final Results
Tamara Davis, on behalf of the entire WiggleZ team.

Observations are now complete for the WiggleZ dark energy survey and we have mapped the positions of 219,682 bright blue galaxies out to a redshift of about z=1, over a cubic giga-parsec of space.  I will present the full complement of cosmological results coming out of this data set.  

With the addition of WiggleZ data, baryon acoustic oscillations are now able to confirm the acceleration of the expansion of the universe, independent of any supernova data, and this has since been further strengthened by the addition of Baryon Oscillation Spectroscopic Survey (BOSS) data.  Arguably the most exciting results are our measurements of the growth of structure out to z~0.8, and measurements of the Alcock-Paczynski effect (sphericity of spheres) that allow us to measure the rate of expansion at different redshifts H(z) without needing a cosmological model.  These allow us to distinguish between non-standard models of gravity that are indistinguishable using only measurements of expansion rate.  I will also cover our constraints on the mass of the neutrino and the effective number of neutrinos, which are amongst the tightest constraints available from any experiment.  Finally, I will show how the large volume we have sampled has allowed us to detect the scale at which the universe transitions from clustered to homogeneous, confirming one of the cornerstones of modern cosmology.  

The WiggleZ data have now been made public, and include data, random catalogues, and lognormal realisations.  With it we have also released our CosmoMC module so our data can easily be included in your own cosmological analyses.