QUBIC: The QU Bolometric Interferometer for Cosmology

One of the major challenges of modern cosmology is the detection of B-mode polarization anisotropies in the CMB. These originate from tensor fluctuations of the metric produced during the inflationary phase. Their detection would therefore constitute a major step towards understanding the primordial Universe. The expected level of these anisotropies is however so small that it requires a new generation of instruments with high sensitivity and extremely good control of systematic effects. We propose the QUBIC instrument based on the novel concept of bolometric interferometry, bringing together the sensitivity advantages of bolometric detectors with the systematics effects advantages of interferometry. Methods: The instrument will directly observe the sky through an array of entry horns whose signals will be combined together using an optical combiner. The whole set-up is located inside a cryostat. Polarization modulation will be achieved using a rotating half-wave plate and interference fringes will be imaged on two focal planes (separated by a polarizing grid) tiled with bolometers. We show that QUBIC can be considered as a synthetic imager, exactly similar to a usual imager but with a synthesized beam formed by the array of entry horns. Scanning the sky provides an additional modulation of the signal and improve the sky coverage shape. The usual techniques of map-making and power spectrum estimation can then be applied. We show that the sensitivity of such an instrument is comparable with that of an imager with the same number of horns. We anticipate a low level of beam-related systematics thanks to the fact that the synthesized beam is determined by the location of the primary horns. Other systematics should be under good control thanks to an autocalibration technique, specific to our concept, that will permit the accurate determination of most of the systematics parameters.Comment: 12 pages, 10 figures, submitted to Astronomy and Astrophysic

QUBIC: The Q&U Bolometric Interferometer for Cosmology - A novel way to look at the polarized Cosmic Microwave Background

In this paper we describe QUBIC, an experiment that takes up the challenge posed by the detection of primordial gravitational waves with a novel approach, that combines the sensitivity of state-of-the art bolometric detectors with the systematic effects control typical of interferometers. The so-called "self-calibration" is a technique deeply rooted in the interferometric nature of the instrument and allows us to clean the measured data from instrumental effects. The first module of QUBIC is a dual band instrument (150 GHz and 220 GHz) that will be deployed in Argentina during the Fall 2018.Fil: Mennella, Aniello. University of Milan; ItaliaFil: Ade, P. A. R.. Cardiff University; Reino UnidoFil: Aumont, J.. Institut d'Astrophysique Spatiale; FranciaFil: Banfie, S.. Istituto Nazionale Di Fisica Nucleare; ItaliaFil: Battaglia, P.. Università degli Studi di Trieste; ItaliaFil: Battistelli, E. S.. Università degli Studi di Roma "La Sapienza"; ItaliaFil: Baùe, F.. Istituto Nazionale Di Fisica Nucleare; ItaliaFil: Buzi, D.. Università degli Studi di Roma "La Sapienza"; ItaliaFil: Columbro, F.. Università degli Studi di Roma "La Sapienza"; ItaliaFil: Bélie, B.. Institute of Fundamental Electronics; FranciaFil: Bennett, D.. Maynooth University; IrlandaFil: Bergé, L.. Centre de Sciences Nucléaires et de Sciences de la Matière; FranciaFil: Bernard, J. Ph.. Institut de Recherche en Astrophysique et Planétologie; FranciaFil: Bersanelli, M.. University of Milan; ItaliaFil: Bigot Sazy, M. A.. APC; FranciaFil: Bleurvacq, N.. APC; FranciaFil: Bordier, G.. APC; FranciaFil: Brossard, J.. APC; FranciaFil: Bunn, E. F.. Richmond University; Estados UnidosFil: Burke, D. P.. Maynooth University; IrlandaFil: Buzi, D.. Università degli Studi di Roma "La Sapienza"; ItaliaFil: Buzzelli, A.. Universita Tor Vergata; ItaliaFil: Cammilleri, D.. APC; FranciaFil: Cavaliere, F.. University of Milan; ItaliaFil: Chanial, P.. APC; FranciaFil: Etchegoyen, Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Tecnología en Detección y Astropartículas. Comisión Nacional de Energía Atómica. Instituto de Tecnología en Detección y Astropartículas. Universidad Nacional de San Martín. Instituto de Tecnología en Detección y Astropartículas; ArgentinaFil: Harari, Diego Dario. Comisión Nacional de Energía Atómica; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Medina, Maria Clementina. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto Argentino de Radioastronomía. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto Argentino de Radioastronomía; ArgentinaFil: Romero, Gustavo Esteban. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto Argentino de Radioastronomía. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto Argentino de Radioastronomía; ArgentinaFil: Suarez, Federico. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Tecnología en Detección y Astropartículas. Comisión Nacional de Energía Atómica. Instituto de Tecnología en Detección y Astropartículas. Universidad Nacional de San Martín. Instituto de Tecnología en Detección y Astropartículas; ArgentinaThe European Physical Society Conference on High Energy PhysicsVeneciaItaliaEuropean Physical Societ

Les métabolites de la vitamine D : leur action sur l'os des rats carencés en vitamine D

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