The Final ACT: Atacama Cosmology Telescope Observations and Cosmological Constraints

This lecture by Arthur Kosowsky from the University of Pittsburgh presents the final results from the Atacama Cosmology Telescope (ACT), which observed the microwave sky from 2008 until its decommissioning in late 2022. Explore the new final sky maps dominated by data from the last four seasons of observation. Learn about the process of creating maps from raw time stream data and extracting angular power spectra. Discover updated constraints on the standard LCDM cosmological model and limits on various speculative extensions. Get a brief progress report on the Simons Observatory project, which aims to extend and broaden ACT's scientific legacy in the coming years.