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Combining Galaxy and CMB Surveys — all the science that “comes for free”

Chem-Phys 155
Speaker(s) / Presenter(s):
Dr. Chihway Chang (University of Chicago)

Host: Su


Title: Combining Galaxy and CMB Surveys — all the science that “comes for free”


Abstract: The LCDM model has been extraordinarily successful. In the past 20 years, the cosmology community has worked hard to make ever more precise measurements of the LCDM parameters using large datasets from cosmic surveys. As error bars shrink and several tensions arise, we are eager to look for new and different ways of making robust statements of the LCDM paradigm. In this talk I like to focus on one particular direction where we can get new information to help this effort — by combining different cosmic surveys, in particular galaxy and CMB surveys. I will first describe the latest cosmological analysis using the Dark Energy Survey (DES) and CMB lensing from the South Pole Telescope (SPT) and Planck. Then I will talk about combining DES galaxies and the thermal Sunyaev Zel'dovich (tSZ) effect measured from SPT and Planck to learn about the baryonic feedback in our galaxies. These analyses will highlight the power of combining different datasets to tackle some of the most pressing issues in observational cosmology today. 

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