Astro Seminar Series - Hybrid Seminar

Jessie Muir is a postdoctoral fellow at the Perimeter Institute for Theoretical physics working on cosmology theory and data analysis. Previously she was a Porat Fellow at KIPAC, at Stanford University, and she obtained her PhD at the University of Michigan. As part of the Dark Energy Survey Theory and Combined Probes working group, she has co-led the analysis team constraining model extensions to LCDM with the survey's first three years of galaxy clustering and weak lensing. 

Talk Title and Abstract

Beyond-LCDM cosmology results from Dark Energy Survey

The Dark Energy Survey (DES) is a 5000 square degree galaxy imaging survey which completed six years of observations in 2019. By measuring the shapes and colors of more than 200 million galaxies in addition to conducting a supernova survey, DES is a multi-purpose experiment that is able to study the large-scale properties of the Universe using measurements of weak gravitational lensing, galaxy clustering, galaxy clusters, and supernovae in order to test the standard cosmological model, LCDM.  I will describe how we use the combined analysis of galaxy clustering and weak lensing to constrain cosmology and will give an overview of the findings from the analysis of the survey's first three years of data. In particular, I will highlight recently released constraints on several models for physics extending LCDM, including time-dependent dark energy equation of state, modified gravity, and light relic sterile neutrinos.

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