Pure-B Filtering by Messenger Method

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Michael Ray
Colin Bischoff

Abstract

By Michael Ray, Physics and Mathematics


Advisor: Colin Bischoff


Abstract: The polarization of the Cosmic Microwave Background (CMB) is a unique probe for studying primordial gravitational waves created at time of the big bang. Gravitational waves show up as B modes in a polarization map but there are ambiguous B modes on a partial sky map around the boundary of the sky cut. To decide which B modes to throw out and which to keep, we employ the "messenger method" - an iterative method to solve for a filtered map. The effectiveness of this method has been demonstrated on simulations of the upcoming CMB-S4 experiment.

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Section
Classic Poster (1:00-3:00 PM)