Wilson: Understanding the Photoelectric Cross Section in Silicon and Germanium: Implications for Dark Photon Searches / Wu: Updates on Delensing of CMB B-modes

May 04, 2018 - 10:30 am to 11:30 am

SLAC, Kavli 3rd Floor Conf. Room

Matthew Wilson (University of Toronto) / Kimmy Wu (KICP)


Inflation generically predicts the existence of primordial gravitational waves (PGW). Searching for this signature in the cosmic microwave background (CMB) B-mode polarization is a major goal for current CMB experiments. One source of foregrounds that obscures the search of PGWs is from the lensing of the CMB, which also produces B modes. Delensing is a technique to estimate and constraint the amount of lensing B modes, reduce it sample variance, and thereby improve the constraints on PGW-generated B modes. In this talk, I will present the latest development of delensing from the BICEP/Keck and South Pole Telescope (SPT) experiments. For future experiments, to optimally extract information from the low noise CMB maps, new techniques for delensing need to be developed. If time permits, I will introduce a forward-looking approach for delensing that outperforms current methods and will be important for next-generation searches of PGW from CMB experiments.