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New Insights into Cosmology and the Galaxy-Halo Connection from non-linear Scales

Current and future galaxy surveys have the potential to transform our understanding of galaxy formation. Information on small, non-linear scales holds the greatest statistical power and potential insight into the galaxy-halo connection. In this talk, I will concentrate on constraints derived from galaxy clustering, galaxy-galaxy lensing and satellite kinematics, showing that there is consistent tension between those different probes. I will present new measurements of the tension between clustering and lensing in the Baryonic Acoustic Oscillations Survey (BOSS). The most promising explanations for this tension, baryonic feedback, assembly bias and cosmological parameters different from the Planck CMB constraints, are discussed. Furthermore, I will show that previous tension between satellite kinematics and other probes can be attributed to systematics in the modelling. We developed an updated, more robust analysis to extract constraints on the galaxy-halo connection from satellite kinematics. The accuracy of this approach is tested using a large number of realistic mock catalogs and shown to yield unbiased, highly competitive constraints. We then apply this updated analysis to the Sloan Digital Sky Survey (SDSS) and compare our inferences from satellite kinematics to those from previous studies.

Speaker: Johannes Lange, Yale

Tuesday, 09/18/18


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Campbell Hall, Rm 131

UC Berkeley
Berkeley, CA 94720