Gravity Group Seminar, François Boulanger (Institut d'Astrophysique Spatiale, Orsay, France)

Fri, Dec 2, 2016, 12:00 pm to 1:30 pm
Joseph Henry Room

TITLE The interstellar B-fields crossing primordial CMB B-modes ABSTRACT Planck, as well as balloon and ground based experiments, have measured the polarization of the sky at sub-mm and mm wavelengths with unprecedented sensitivity. The data analysis involves research in cosmology and Galactic astrophysics, which might lead to a major discovery for fundamental physics. The main goal is to characterise anisotropies in polarization of the Cosmic Microwave Background (CMB) with sufficient precision and confidence to detect the expected signature from primordial gravitational waves. At the same time, we are getting the data needed to characterise interstellar polarization and magnetic fields in the diffuse interstellar medium and molecular clouds. The analysis of Planck data has led to a statistical modelling of dust emission as a foreground to CMB polarization, which may be used to optimize and assess component separation. I will review this work in the context of future CMB experiments.