Grâce aux mesures de lentillage gravitationnel et de clustering des galaxies, Euclid posera des contraintes sans précédent sur l'Univers récent. D'autre part, des observations CMB de haute qualité (Planck et futures expériences) sont capables d'imposer des contraintes strictes sur l'Univers primordial. La combinaison de ces deux sources d'informations cosmologiques peut constituer un bras de...
The thermal Sunyaev-Zeldovich (tSZ) effect is produced by the inverse Compton scattering of cosmic microwave background (CMB) photons by hot electrons, particularly in galaxies clusters. It has been used as a powerful tool to constrain the cosmological parameters given its particular sensitivity to sigma8 and omega_m.
I produced a new all-sky tSZ map constructed from the latest Planck PR4...
Characterising accurately the polarised dust emission from our Galaxy will be decisive for the quest for the Cosmic Microwave Background (CMB) primordial $B$-modes. The incomplete modelling of its potentially complex spectral properties could lead to biases in the CMB polarisation analyses and to a spurious detection of the tensor-to-scalar ratio $r$. It is particularly crucial for future...
With a single training image and using wavelet phase harmonic augmentation, we present polarized Cosmic Microwave Back- ground (CMB) foreground marginalization in a high-dimensional likelihood-free (Bayesian) framework. We demonstrate robust foreground removal using only a single frequency of simulated data for a BICEP-like sky patch. Using Moment Networks we estimate the pixel-level posterior...
LiteBIRD is a full sky space mission, expected to be launched in the late 2020s, whose goal is to constrain primordial physics via a high precision measurement of CMB polarization. It is a strategic Large-class mission of JAXA and is strongly supported in Europe, in particular by CNES which is in charge of the Medium and High Frequency Telescopes. LiteBIRD's main scientific objective is to...
CMB observations from the Planck satellite have provided cosmic variance limited temperature measurement at large and intermediate scales. In the next couple of years, ground-based experiments such as SPT, ACT and Simons Observatory will make a high resolution measurement of CMB polarization, allowing the extraction of competitive cosmological informations from $C_\ell^{EE}$ and $C_\ell^{TE}$....
A dedicated 15m telescope could map the all-sky in the millimetre, adding 20 arcsecond resolution to Planck all-sky maps. We will present the scientific drivers for that instrument: CMB, lensing, SZ, Cosmic Web, CIB, and Polarized dust. This would provide a European original contribution to the S4 efforts at a moderate cost (20ME).
