Laura Salvati
Institut d'Astrophysique Spatiale (Orsay, France)
Addressing this challenge requires a coherent modeling framework that connects the Last Scattering Surface to the formation of Large-Scale Structure, consistently accounting for astrophysical effects along the way. One promising approach is to develop a unified description of the Cosmic Microwave Background (CMB) and its foreground signals. Importantly, many extragalactic foregrounds are not merely contaminants, but valuable cosmological and astrophysical tracers of structure formation.
Nevertheless, most current CMB analyses rely on simplified template descriptions of foregrounds, which do not fully exploit their underlying cosmological and astrophysical information. I will show how implementing a physically consistent modeling of the thermal and kinetic Sunyaev–Zeldovich effects can both tighten cosmological constraints from the CMB and contribute to a unified framework that connects early-Universe physics to the late-time evolution of large-scale structure. The thermal Sunyaev–Zeldovich (tSZ) effect traces hot ionized gas and provides a powerful tool for detecting and studying galaxy clusters. The kinetic Sunyaev–Zeldovich (kSZ) effect, sensitive to the bulk motion of ionized gas, offers unique insight into the distribution of baryons and the epoch of reionization. Together, these observables help bridge early- and late-time cosmology within a consistent physical framework.
Amphithéâtre Henri Mineur, Institut d'Astrophysique de Paris