Cosmologie

Multichroic detectors for Cosmic Microwave Background polarisation observation

The study of polarized fluctuations in the 3K Cosmic Microwave Background (CMB) appears today as an essential way to progress in our understanding of the Universe. The European community is now taking part in the LiteBird small satellite and is also studying a large mission in preparation for the ESA M6 call.

Novel techniques for design and optimization of next generation, foreground-robust, space-based CMB missions and their data analysis - an application to the design and optimization of the LiteBIRD mission.

Photo prise lors du meeting de la collaboration QUBIC, Nov. 2019, à l’APC. Crédits QUBIC

Réfrigérateur à dilution sans fluide en circulation

L’étude de l’Univers froid nous permet de remonter aux origines, que ce soit celles de notre système solaire avec l’observation des embryons d’étoiles ou celles de l’Univers avec la mesure de la polarisation du rayonnement fossile. Ces instruments d’observations dans les domaines sub-millimétrique et millimétrique nécessitent l’utilisation de détecteurs supraconducteurs refroidis jusqu’à 100mK. Ceci rend ces expériences particulièrement complexes à mettre en oeuvre, en particulier au niveau système.

The Role of Polarization in 21 cm Radio Surveys

The Role of Polarization in 21 cm Radio Surveys

Martin Bucher (bucherapc.univ-paris7.fr) and Francois Boulanger (francois.boulangerens.fr)

2-year postdoctoral position in probabilistic deep neural networks for weak lensing

Probing dark energy with multi-survey joint analyses: shear measurement with machine learning.

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, while dominating the energy budget of the Universe, remains mysterious and its comprehension is the current Graal of the domain. The next generation of cosmological surveys, among which Large Synoptic Survey Telescope (LSST) & Euclid, both starting in 2022, are a major step toward in observational cosmology toward the parametrization of dark energy.

Cosmic Microwave Background Observations for Large-Scale Structure Studies

The Planck mission and the current generation of ground-based cosmic microwave background (CMB) experiments (e.g., the Atacama Cosmology Telescope and the South Pole Telescope) have ushered in a new era of large-scale structure (LSS) studies. With arcminute resolution at frequencies around 100 GHz, CMB observatories probe the distribution of ionized gas in the circumgalactic medium (CGM) and the intergalactic medium (IGM) through the Sunyaev-Zeldovich (SZ) effects, the total mass distribution through gravitational lensing of the CMB and dust emission associated with star formation

Recherche d'ondes gravitationnelles primordiales dans le Big Bang avec QUBIC, l'interféromètre bolométrique pour la cosmologie

Recherche d'ondes gravitationnelles primordiales dans le Big Bang avec QUBIC, l'interféromètre bolométrique pour la cosmologie

On October 4, 2019, the LSST camera's filter changer flew to San Francisco. Read more...

LABORATOIRE

ASTROPARTICULE & COSMOLOGIE