KIPAC Seminar: Cosmology from CMB and large-scale structures with old and new probes

Cosmology is entering a new era of high-precision science with the next generation of ground-based CMB experiments and galaxy surveys, including the Simons Observatory, Euclid, Rubin, and SPHEREx. These experiments will deliver high-sensitivity datasets over large fractions of the sky, enabling us to constrain cosmology and astrophysics across all scales. 

In the first part of this talk, I will review the status of the Euclid mission, presenting its scientific objectives, observational strategies, and synergies with CMB experiments. I will discuss key results from its first public data release (Q1) and what these data reveal about performance as we approach the mission’s first cosmological analysis, expected in about a year. 

In the second part, I will focus on new probes of the primordial and late-time Universe that can be extracted from CMB observables complementary to anisotropies: CMB spectral distortions. I will demonstrate how a reanalysis of archival COBE/FIRAS data, using modern techniques, significantly improved upon the original FIRAS results after 30 years and placed the first constraints on feedback processes in galaxy formation. I will discuss how these advances highlight the promising prospects for future experiments such as the BISOU balloon and the FOSSIL mission in Europe.