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QUBIC, a bolometric interferometer to measure the B-modes of the CMB

Published online by Cambridge University Press:  24 December 2009

L. Spinoglio ,
N. Epchtein ,
J.-C. Hamilton  and
R. Charlassier
J.-C. Hamilton
Affiliation:
Laboratoire APC, Université Paris Diderot, Paris 7, CNRS, IN2P3, 10 rue Alice Domon et Léonie Duquet, 75205 Paris, France
R. Charlassier
Affiliation:
Laboratoire APC, Université Paris Diderot, Paris 7, CNRS, IN2P3, 10 rue Alice Domon et Léonie Duquet, 75205 Paris, France
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Abstract

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.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 40: 3rd ARENA Conference: An Astronomical Observatory at CONCORDIA (Dome C, Antarctica) , 2010 , pp. 399 - 404
Copyright
© EAS, EDP Sciences, 2010

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