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3rd ARENA Conference: An Astronomical Observatory at CONCORDIA (Dome C, Antarctica), Frascati : Italie (2009)
QUBIC, a bolometric interferometer to measure the B-modes of the CMB
J.-C. Hamilton1, R. Charlassier1

The quest for the B-modes in the CMB polarization is one of the main challenges of modern cosmology as it would allow to give sharp constraints on the inflationary period. One of the main challenges of B modes detection is the treatment of systematic errors. Comparison of observations subject to different systematics is crucial. Interferometers offer such an alternative to imagers. However, to obtain the required sensitivity, a very large number of baselines is needed, which is extremely difficult to achieve with heterodyne interferometry. Bolometric interferometry copes with this problem using a new technique: the interference pattern produced by a few hundred horns is imaged on a bolometer array, and a time modulation of phase shifts insures the separation of visibilities while coherently adding redundant ones. The QUBIC collaboration proposes to build such an instrument.
1 :  APC - UMR 7164 - AstroParticule et Cosmologie
APC - Cosmologie et gravitation
Planète et Univers/Astrophysique/Cosmologie et astrophysique extra-galactique

Physique/Astrophysique/Cosmologie et astrophysique extra-galactique