Measuring Dark Energy With The Wigglez Survey

Details Measuring Dark Energy With The Wigglez Survey Measuring Dark Energy With The Wigglez Survey

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21940204b&link_type=abstract

American Astronomical Society, AAS Meeting #219, #402.04

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We present new measurements of the cosmic expansion history and growth history over the last 7 billion years, using data from the WiggleZ Dark Energy Survey of 200,000 galaxy redshifts. We have used baryon acoustic oscillations (BAOs) in the galaxy distribution as a standard ruler to measure the distance-redshift relation up to z=0.73, and present a BAO "Hubble diagram" which provides a powerful cross-check of the use of Type Ia supernovae as standard candles. We additionally use redshift-space distortions in the galaxy clustering pattern to determine the cosmic growth rate with 10% accuracy in redshift bins up to z=0.9. We show that a cosmological constant model of dark energy is able to simultaneously fit both the expansion and growth data. Finally, we measure Alcock-Paczynski distortions in the clustering pattern to reconstruct the expansion history in a non-parametric manner, demonstrating the reality of accelerating cosmic expansion.

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