Speaker
Description
The gravitational lensing of the Cosmic Microwave Background (CMB) provides a powerful and robust probe of the projected matter distribution across cosmic time, offering unique sensitivity to the growth of large-scale structure, cosmic expansion, and fundamental physics such as the sum of neutrino masses. As cosmology enters a high-precision era, CMB lensing has become a cornerstone observable for testing the standard ΛCDM model and characterizing emerging tensions.
In this talk, I will present results from the final data release of the Atacama Cosmology Telescope (ACT), including state-of-the-art CMB lensing maps covering 30% of the sky. These maps combine improved nighttime and daytime ACT observations with large-scale CMB data from Planck, delivering high-fidelity lensing reconstructions that substantially advance over previous measurements. I will discuss updated constraints on the amplitude of structure growth, neutrino mass upper limits, and other key cosmological parameters derived from these maps, as well as their implications for current cosmological tensions and possible extensions beyond ΛCDM.