CCAPP Seminar: "Cosmological constraints from galaxy clustering and weak lensing using Dark Energy Survey Year 1 data: Methodology and Validation" Niall MacCrann (OSU)

February 12, 2018
Tuesday, June 27, 2017 - 11:30am to 12:30pm
PRB 4138
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I'll give an update on the key cosmological analysis of Dark Energy Survey Year 1 data, in which galaxy clustering and weak lensing information are combined to produce highly competitive cosmological constraints. As well as providing complementary cosmological information, this multi-probe analysis breaks degeneracies between systematics, such as galaxy intrinsic alignments, and cosmological parameters. After a brief introduction to the theory, I will discuss some of challenges we have faced in controlling systematics at the required level for this complex and high precision analysis. I will demonstrate the approach we have taken to ensuring the robustness of our results, including extensive validation on mock survey data. I will show forecasted and/or blinded cosmological parameter constraints.

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