Florian Beutler
(University of Western Australia)
Abstract:
In my talk I will present results of the large scale structure analysis with the 6dF Galaxy Survey (6dFGS). The large-scale correlation function of 6dFGS allows the detection of a Baryon Acoustic Oscillation (BAO) signal. The low effective redshift of 6dFGS makes it a competitive and independent alternative to Cepheids and low-z supernovae in constraining the Hubble constant. It also depends on very different systematic uncertainties. We found a Hubble constant of H_0 = 67 +/- 3.2 km/s/Mpc in agreement with analyses of the Cosmic Microwave Background. We also use the measurement of redshift space distortions (f\sigma_8) to test General Relativity. Modifications of General Relativity are one possible explanation of the observed effect of dark energy. My talk will also discuss prediction for the future WALLABY survey, which will be able to constrain f\sigma_8 to 3-4% precision and will provide a low redshift anchor for this sort of measurements. WALLABY is a radio galaxy survey and a precursor for much larger galaxy surveys, which future radio telescopes like the SKA will deliver.