Dr. Matthew Madhavacheril, Perimeter Institute
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Abstract: While the Planck satellite has measured large-scale temperature anisotropies in the cosmic microwave background (CMB) to excellent precision, a wealth of information remains to be uncovered in small-scale ‘secondary’ anisotropies of the CMB. These include gravitational lensing and the Sunyaev-Zeldovich effects due to scattering of photons off hot and/or moving clouds of ionized gas. Measuring these CMB secondaries allows us to map out the distribution of mass, gas and velocity in the Universe, all of which are difficult to measure through other means. The statistics of the mass, gas and velocity distribution will allow for yet another leap in our understanding of cosmology and fundamental physics by probing the particle nature of dark matter, neutrino physics, dark energy and the initial conditions, in addition to providing new insights into galaxy formation. I will present new maps, catalogs and results from the Atacama Cosmology Telescope (a ground-based high-resolution CMB survey) that mark the beginning of arcminute-resolution wide-area CMB science. I will also present new applications of CMB secondaries in the context of the upcoming Simons Observatory survey.
Zoom Link: https://arizona.zoom.us/my/astr.n305, or https://arizona.zoom.us/j/3926316088