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Constraining bias and cosmic growth at z=0.6 with the WiggleZ survey

by Felipe Marin (Swinburne University of Technology, Hawthorn, AU)

Jul 17, 2014 from 02:00 PM to 03:30 PM

Where Seminars' room, floor -1, via Ranzani 1

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The use of 2-point statistics (correlation functions and Power spectra) has
been the common tool to analyse the galaxy distribution and obtain constraints
on cosmological and galaxy formation models. But it does not contain all the
information available from the galaxy field, and theoretical understanding
combined with improved computation techniques allow us to include other
statistics and observables to obtain additional constraints.
In this talk I present results from the analysis of the WiggleZ 3-point
correlation function, which measures the probability of finding triangles in
the galaxy field; using this statistic we can constrain galaxy bias and
estimate the cosmological growth function at different epochs. Secondly,
I present preliminary results of constraints in the growth rate of structure
combining clustering from the WiggleZ and BOSS surveys sharing the same
volume, using the method of modelling redshift-space distortions. With the
current surveys, applying these methods we estimate the evolution of cosmic
growth, finding agreement with the predictions of the concordance LCDM
universe. I will discuss the outlook for future surveys, where these methods
promise to improve the power of prediction from galaxy surveys, in order to
understand questions on the nature of dark energy and gravity models.