Judit Prat (U Chicago)
Tue. October 5th, 2021, 11:30 am-12:30 pm
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Cosmology from weak lensing and galaxy clustering in the Dark Energy Survey
Galaxy cosmic surveys such as the Dark Energy Survey are a powerful tool to extract cosmological information. In particular, the combination of weak lensing and galaxy clustering measurements, usually known as 3x2pt, provides a potent and robust way to constrain the parameters controlling the structure formation in the late Universe. In this talk I will give an overview of the results and methods of Dark Energy Survey Y3 3x2pt cosmological analysis, focusing specially on the galaxy-galaxy lensing probe, which is the cross-correlation of the shapes of source background galaxies with lens foreground galaxy positions. I will also describe how we can construct suitable ratios of these galaxy-galaxy lensing measurements to exploit the otherwise usually disregarded small-scale information and naturally integrate it as part of the 3x2pt analysis.
Host: Idit Zehavi