The primordial B-mode polarisation of the Cosmic Microwave Background is the imprints of the gravitational wave background generated by inflation. Observing the B-mode is up to now the most direct way to constrain the physics of the primordial Universe, especially inflation. To detect these B-modes, high sensitivity is required as well as an exquisite control of systematics effects. To comply with these requirements, we propose a new instrument called QUBIC (Q and U Bolometric Interferometer for Cosmology) based on bolometric interferometry. The control of systematics is obtained with a close-packed interferometer while bolometers cooled to very low temperature allow for high sensitivity. We present the architecture of this new instrument, the status of the project and the self-calibration technique which allows accurate measurement of the instrumental systematic effects.
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This work was supported by Agence Nationale de la Recherche (ANR), Centre National d’Etudes Spatiales (CNES), Centre National de la Recherche Scientifique (CNRS), Science and Technology Facilities Council (STFC), the National Science Foundation (NSF), the National Aeronautics and Space Administration (NASA), Instititut Paul Emile Victor (IPEV), Programma Nazionale Ricerche in Antartide (PNRA) and Science Foundation Ireland (SFI).
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Piat, M., Battistelli, E., Baù, A. et al. QUBIC: the Q&U Bolometric Interferometer for Cosmology. J Low Temp Phys 167, 872–878 (2012). https://doi.org/10.1007/s10909-012-0522-x
- Cosmic microwave background