Cross-correlation analyses between tracers of the large-scale structure (LSS) of the Universe have become one of the most powerful tools in modern astrophysics and cosmology. By combining independent observables, we can map the distribution of both dark and luminous matter across different cosmic epochs while better handling the instrumental and observational systematics that often affect single surveys. Moreover, this approach allows us to effectively break degeneracies between nuisance and cosmological parameters, providing competitive constraints on both. In this talk, I will discuss the cross-correlation of Cosmic Microwave Background (CMB) lensing with radio galaxy maps and with the Quaia quasar sample, showing how these tracers map the growth of cosmic structures up to high redshifts. I will then focus on state-of-the-art results obtained from the newly released Euclid Quick Release 1 (QR1) data, presenting their high-significance cross-correlation with both CMB lensing and the EMU radio survey. Ultimately, this overview highlights how synergies approaches between LSS observables can be a unique tool for testing our description of the Universe.
04/06/2026
Speaker. Giulia Piccirilli
June 4th at 12:00 CEST in Aula Gratton
To follow remotely, you can use this link: https://meet.google.com/nxs-dfyi-qpc