MG14 - Talk detail

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Abstract

One of the major challenges of modern cosmology is the detection of primordial B-mode polarization anisotropies in the CMB, a smoking gun for inflation, particularly emphasized in 2014 with an announcement by BICEP2 later questioned by Planck collaboration showing that it was most likely due to contamination by polarized emission from dust in our own Galaxy. We are constructing QUBIC, the first bolometric interferometer, to be installed at the Concordia base in Dome C, Antarctica at the end of 2016, to measure the B-modes of the CMB on large scales. Bolometric Interferometry is a novel instrumental concept allowing for exquisite control of instrumental systematics (through the "self-calibration" technique) as well as the "Background Limited" sensitivity of bolometers. Our two bands (150 and 220 GHz) allow to efficiently control dust polarization contamination and achieve a conservative r<0.05 (95% CL) in two years (including realistic detection efficiency and foregrounds).

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