Following on the submission of four coordinated white papers in answer to the ESA "Voyage 2050" consultation of the scientific community, CMB spectral distortions has been identified as one of possible science themes for a future L-class space mission to be launched in the 2035-2050 time frame. I will summarize the science cases, observation requirements, and possible mission profiles in this context.
Multi-field inflation models predict sizeable non-Gaussian primordial perturbations and consequently anisotropic $\mu$-type spectral distortions of the cosmic microwave background (CMB) blackbody. While CMB anisotropies allow us to probe primordial non-Gaussianity at wavenumbers $k \simeq 0.05\,{\rm Mpc}^{−1}$, $\mu$-distortion anisotropies are related to non-Gaussianity of primordial...
We advocate R&D in spectroscopy with KIDs to tackle polarized foregrounds in the next generation CMB instruments. In particular, in order to remove the dust polarized emission, the use of low resolution spectrocopy may be required. I will present Grenoble efforts towards that goal.
