Physics Colloquium - Cosmology with ACT and the Simons Observatory

The Cosmic Microwave Background (CMB) encodes the history of our Universe, spanning enormous ranges of time and physical scale-from conditions in its earliest moments to the distribution of matter on the largest scales. Precision measurements of the CMB provide constraints on a diverse set of phenomena, including inflationary physics, light relic particles, dark matter, dark energy, and a broad range of astrophysical processes. In this talk, I present results from the Atacama Cosmology Telescope (ACT) and discuss the progress that will be made with its recently commissioned successor, the Simons Observatory.