Probing Cosmic Structure Growth with Full-Scale Cross-Survey Modeling

Speaker

Johannes Lange
University of Michigan (USA)

Abstract

The canonical picture of cosmology, the Lambda Cold Dark Matter (LCDM) model, has been remarkably successful in explaining a large variety of different observations. However, in recent years, apparent tensions in this standard model have started to appear and spark interest in alternative cosmological models. Cosmic structure growth as probed by large-scale structure (LSS) galaxy surveys is one of the most sensitive probes of dark energy and physics beyond LCDM. First, I will summarize recent results from LSS surveys analyzing weak gravitational lensing, focusing on the possibility of a cosmological growth-of-structure tension. I will then present ongoing efforts to maximize the information content we can extract from LSS surveys through full-scale cross-survey modeling. I will discuss how the "lensing is low" problem can illuminate our understanding of cosmic structure growth, galaxy formation, and small-scale baryonic physics. Afterward, I will present a full-scale cosmology study of redshift-space galaxy clustering. I show that such an analysis yields some of the most stringent constraints on the cosmic growth rate of the Universe to date. Finally, I will give an outlook on what to expect from similar studies with the upcoming Dark Energy Spectroscopic Instrument (DESI).

Date and Time

November 24 2022
10am KST (= 1am UTC)

Zoom link (active once the seminar started)

Recording

Link to the recording on YouTube