Colloque national CMB-France #8

Session

Sessions 8

26 nov. 2026, 11:00

Institut Astrophysique de Paris

29. Galactic Science with the LiteBIRD satellite: Spectral characterization of diffuse Galactic polarized emission at the angular power spectrum level

Samy Vinzl (IRAP)

26/11/2026 11:00

Accurate modeling of polarized Galactic emission has become a major challenge for current and next-generation Cosmic Microwave Background (CMB) B-mode experiments. Ignoring the spectral complexity of thermal dust and Galactic synchrotron emission when integrating along the line of sight and over large sky fractions inevitably leads to biases in CMB polarization analyses.
In this talk, I will...

27. Bayesian inference of polarised dust SED variations with scattering transforms: validation on Planck-like simulations

Sébastien Pierre (LPENS)

26/11/2026 11:20

Spatial variations of the polarized dust spectral energy distribution (SED) are a major concern for the search for primordial Cosmic Microwave Background (CMB) $B$-modes, as they could be misinterpreted as a cosmological signal. These variations are however difficult to characterize, since only a few noisy polarized channels trace dust in currently available surveys. For this purpose, we...

28. Non-parametric spectral-matching component separation for measuring CMB B-mode polarization with a satellite mission

Hoang Viet Tran (APC, Université Paris Cité)

26/11/2026 11:40

The measurement of primordial CMB B-mode polarization is fundamentally limited by our ability to separate this faint signal from bright and complex Galactic foregrounds. Spectral Matching Independent Component Analysis (SMICA) offers a flexible, semi-blind approach to this foreground-cleaning problem. However, its standard implementation relies on a physically unrealistic assumption of...