Using galaxy surveys to understand the cosmological evolution.
Wed 17 April, 2019 @14:15 PM, level 7, David Caro Building
Dr Rossana Ruggeri, Swinburne University
With the aid of millions of galaxies, cosmology, as a data driven discipline, investigates the physics just after the Big-Bang, when the seeds of anisotropies ( later becoming galaxies through gravity ) were created and the effect of dark energy driving the evolution of the Universe today.
In this talk I will present various ways in which we can use galaxy redshift surveys to test theoretical models. In particular, using observables like Baryon Acoustic Oscillations and Redshift-space distortions, we can measure the cosmological parameters as well as test models of dark energy and modified gravity. The low statistical errors on cosmological parameters promised by future galaxy surveys will only be realised with the development of new, fast, analysis methods that reduce potential systematic problems to low levels. In the second part of my talk, I will present an efficient method for measuring the redshift evolution in the cosmological parameters and its application to measure the latest eBOSS DR14 data.