Event Details

Cosmological Lensing: From Detectors to Dark Energy

Abstract:

Twenty years after the first joint detections of gravitational lensing by large-scale structure (cosmic shear), current galaxy lensing surveys are placing impressive constraints on our understanding of structure growth over cosmic time, even rivaling the precision delivered by cosmic microwave background (CMB) experiments. However, to effectively harness the statistical power of upcoming surveys using the Vera C. Rubin Observatory and the Nancy G. Roman Space Telescope, we must carefully characterize and control potential sources of systematic error. I will speak about some of the most precarious moving parts of the analysis, such as the galaxy shape measurements and the photometric redshift distributions, in the context of results from ongoing ground-based galaxy surveys like the Dark Energy Survey. I will also describe ways in which we are preparing for our pursuit of the origins of cosmic acceleration with Rubin and Roman.