Résumé / Abstract Seminaire_IAP
« Cosmology from CMB experiments and galaxy surveys from space »

Giulio Fabbian

Cosmology is entering a new era of high-precision science, driven by next-generation ground-based CMB experiments and space-based galaxy surveys, including the Simons Observatory, Euclid, Rubin, and SPHEREx. Together, these experiments will deliver high-sensitivity data over large fractions of the sky, allowing us to constrain cosmology and astrophysics across a wide range of scales.

I will review the key scientific questions in cosmology and astrophysics that can be addressed through joint analyses and cross-correlations between CMB and large-scale structure probes. I will then focus on two space-based galaxy surveys with particularly strong CMB cross-correlation potential: Gaia and Euclid.

I will first discuss Euclid's progress, presenting preliminary cosmological results from its early Q1 data release combined with CMB data and SKA precursor surveys. I will then show how Euclid's first major data release will sharpen these results by combining its galaxy, QSO/AGN, and cosmic shear samples with CMB lensing, thermal Sunyaev-Zel'dovich (tSZ), and kinetic Sunyaev-Zel'dovich (kSZ) measurements.

In the final part of the talk, I will review cosmological results obtained from Quaia, the largest quasar catalog to date built from the third data release of Gaia, and CMB probes, and discuss prospects for extending these analyses with Gaia fourth data release later this year.
vendredi 25 septembre 2026 - 11:00
Amphithéâtre Henri Mineur, Institut d'Astrophysique de Paris
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