Cosmologie

Dilution refrigerator without circulating fluid

The study of the cold Universe allows us to go back to the origins of our solar system with the observation of star embryos and the origins of the Universe with the measurement of the polarization of the Cosmic Microwave Background. The astronomical instruments in the sub-millimetre and millimetre domains require the use of superconducting detectors cooled down to 100mK. This makes these experiments particularly complex to implement, especially at the system level. A simplification of cryogenic systems would be a major asset for future instruments.

Deblending galaxies for Vera Rubin Observatory LSST & Euclid weak lensing studies

During the last decade, cosmology has entered a precision era, leading to the prevalence of the standard cosmological model, ΛCDM. Nevertheless, the main ingredient of this model, dark energy, remains mysterious while dominating the energy budget of the Universe. Its comprehension is the current Graal of this domain. The next generation of cosmological surveys, among which Legacy Survey of Space and Time (LSST) of the Vera Rubin Observatory (on the ground) & Euclid (in space), both starting in 2022, are in that regard the most important projects for the next 10 years. 

Détecteurs à inductance cinétique pour la mesure de la polarisation du fond diffus cosmologique

L’étude des fluctuations polarisées du rayonnement fossile à 3K (Cosmic Microwave Background, CMB) apparaît aujourd’hui comme une voie incontournable pour progresser dans notre compréhension de l’Univers. Le niveau de signal attendu, quelques nK pour le mode B le plus faible, requiert une chaîne de détection à la fois ultra sensible et extrêmement immune aux effets parasites instrumentaux. 

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