Neelima Sehgal, Stony Brook University

"Mapping Dark Matter on Large and Small Scales with the Cosmic Microwave Background"

Abstract: I will discuss the next frontier of research on the Cosmic Microwave Background (CMB): precisely measuring the gravitational lensing of the CMB. This CMB lensing signal encodes a wealth of statistical information about the distribution of matter in the Universe, which is sensitive to the total mass of the neutrinos and the particle properties of dark matter. I will discuss upcoming results using data from the Atacama Cosmology Telescope, and forecasts for the near-future Simons Observatory and CMB-S4 experiments. I will also discuss a novel way to probe dark matter particle properties using ultra-high resolution CMB lensing measurements, and a new experiment, called CMB-HD, which can achieve this science plus probe light relic particles and inflation with unprecedented sensitivity.