Cosmologie

Impact of foregrounds on search for primordial gravitational waves with current and planned CMB observations.

CMB B-mode studies are amongst the most exciting, contemporary endeavors in the field of cosmology. They are broadly expected to provide a new, unique window on the physics of the very early Universe, giving a very strong evidence in favor of inflation as a correct paradigm, within which to model this phase of the Universe's evolution, but also potentially constraining some of the fundamental energy scales of physics. These are hoped to provide some essential clues for high energy physics models.

Search for primordial gravity waves with the new generation of the CMB polarization observatories

CMB B-mode studies are amongst some of the most exciting, contemporary endeavors in the field of cosmology. They are broadly expected to provide a new, unique window on the physics of the very early Universe, potentially detecting primordial gravitational waves, giving a very strong evidence in favor of inflation as a correct paradigm, within which to model this phase of the Universe's evolution, and thus potentially constraining some of the fundamental energy scales of physics. These are hoped to provide some essential clues for high energy physics models.

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.

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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