CCAPP Seminar - Blake Sherwin (Princeton) "CMB Lensing Measurements: Mapping Dark Matter with ACT and ACTPol"

CMB lensing measurements use the cosmic microwave background to map the projected distribution of dark matter out to high redshifts. I will describe the first detection of the CMB lensing power spectrum with the Atacama Cosmology Telescope (ACT) and its cosmological implications, and will show results from cross-correlations of ACT CMB lensing maps with quasars, galaxies and other tracers of dark matter. I will then explain the great scientific potential of upcoming polarization lensing measurements with ACTPol, and will discuss the development of a lensing pipeline for this experiment.