Measurements of the Cosmic Microwave Background (CMB) have transformed cosmology into a precision science, and they continue to deliver new insights into the birth and evolution of our Universe. One of the major hurdles in extracting these insights, however, come from "foreground" signals emitted from intervening matter. These spurious emissions can mask and even mimic the primordial CMB, introducing errors into our conclusions.

This thesis would address these problems in a couple of new ways -- by using different combinations of data to "null" the CMB before estimating the foregrounds, and by using different techniques for segmenting the sky in order to allow us to account for variations in the properties of the foregrounds over there sky.

There would be a fair amount of computing, and the work would be done in the contexts of the Simons Observatory and the LiteBIRD collaborations.