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Cosmology with the Dark Energy Survey, and Beyond

Physics/Astro Auditorium

Elizabeth Krause (University of Arizona)

November 15, 2018 @ 4:00 PM - 5:00 PM

The accelerated expansion of the Universe is the most surprising cosmological discovery in decades. It has inspired a new generation of ambitious surveys to determine the fundamental nature of this acceleration. I will introduce the different measurement techniques used by today’s cosmologists, describe the landscape of current and near future wide-field galaxy surveys, and present cosmology constraints from the first year of the Dark Energy Survey (DES Y1). This analysis constrains the composition and evolution of the Universe through a combination of galaxy clustering, galaxy-galaxy lensing, and cosmic shear. These three measurements yield consistent cosmological results, and in combination they provide some of the most stringent constraints on cosmological parameters. I will describe the validation of measurements and modeling from pixels to cosmology and I will give an outlook on cosmology analysis plans and challenges for future, much larger experiments such as LSST and WFIRST.