Orateur
Description
One of the most powerful tests of our cosmological model and of new physics is to determine the growth of large-scale structure with time. Motivated by this and by reports of tensions in structure growth and neutrino mass measurements, in the first part of my talk I will show state-of-the-art determinations of cosmic structure growth using CMB gravitational lensing measurements from the Atacama Cosmology Telescope (ACT). I will discuss the implications of our ACT DR6 lensing results for the validity of our standard cosmological model, for key cosmological parameters, and for upcoming lensing analyses with the Simons Observatory.
I will also present first measurements of a new probe of cosmic structure and the early universe: the cosmic velocity field reconstructed from the kinetic SZ (kSZ) scattering effect. After showing our early measurements of this signal with ACT, I will explain why such velocity measurements may soon be the key to reliable measurements of primordial non-Gaussianity from large-scale structure.
