Cosmologie

Theory and observations of the 21cm line at large redshift

Radio astronomy is undergoing a period of rapid advances because of digital techniques that allow an improvement in sensitivity of several orders of magnitude. The universe nearby and the initial conditions of the universe have now been characterized at great precision thanks to modern galaxy surveys and precision measurements of the cosmic microwave background. But the intermediate epoch, sometimes dubbed the “Dark Ages,” remains largely unexplored. However precision measurements using the 21cm line will allow a detailed three-dimensional characterization of this intermediate epoch.

Analyse multicomposante de l’émission polarisée du ciel pour l’observation de la polarisation du fond cosmologique

Courant 2015, la collaboration Planck a publié les résultats de la mesure du spectre de puissance angulaire des anisotropies du CMB en température et polarisation, permettant de contraindre avec une précision sans précédent les six principaux paramètres nécessaires pour expliquer les données.

Analysis and modelling of polarized sky emission in WMAP and Planck data sets

Analysis and modelling of polarized sky emission in WMAP and Planck data sets

In 2015, the Planck collaboration has published the results of the measurement of the temperature and polarisation angular power spectra of CMB anisotropies, constraining with unprecedented accuracy the six major cosmological parameters necessary to fit the data.

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