South Pole CMB measurements: Results from BICEP/Keck and the South Pole Telescope, and near term prospects

The BICEP/Keck Array (BK) and the South Pole Telescope (SPT) are two cosmic microwave background (CMB) experiments located at the South Pole. The BK telescopes are small aperture refractors that focus on resolving the degree-scale B-mode feature imprinted on the CMB by inflationary gravitational waves, whose amplitude is related to the energy scale of inflation in simple inflation models. The South Pole Telescope is a 10m telescope with ~1 arcmin resolution imaging broad scales of cosmic structures including galaxy clusters.

In this talk, I will give an overview of both experiments' latest results, including the tightest constraints on the tensor-to-scalar ratio r to-date, measurements of CMB lensing, and cosmology from CMB spectra and cluster counts. In particular, I will highlight the joint analysis of these two experiments’ datasets: delensing BK B-mode measurements using lensing template generated by SPT, Planck, and CIB measurements, and the future of delensing with BICEP Array and SPT-3G data. Lastly, I will give current instrument updates from both experiments: BICEP Array development and SPT-3G observations.