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Presented By: Department of Physics

HEP-Astro Seminar | The DES Year-3 Cosmic Shear Results

Lucas Secco (University of Chicago/Kavli Institute of Cosmological Physics)

The Dark Energy Survey (DES) has recently completed the blinded analysis of its first 3 years of data. We have obtained cosmological constraints from a powerful weak lensing data set of more than 100 million galaxies spanning an effective area of over 4000 square degrees. In this talk, I will present the constraints on the lensing amplitude parameter S8 that come from cosmic shear correlations in DES Y3. I will describe what the DES Y3 results add to our understanding of the apparent tension in S8 between low-redshift weak lensing constraints and those inferred via the Cosmic Microwave Background (CMB). I will also describe our approach to mitigating the main modeling/astrophysical systematics of cosmic shear, namely baryons and intrinsic alignments (IA), and what our data says about the IA signal under a Bayesian model selection method. I will finally comment on a novel detection of 3-point shear correlations and what to expect from DES Y6.

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