Speaker
Description
CMB lensing provides a powerful way to measure the mass of the neutrinos. Traditional analyses of CMB lensing can suffer from biases in neutrino mass constraints if the wrong dark energy model or parametrization is assumed. In this talk, I will present a method to remove low-redshift contributions from CMB lensing mass maps, enhancing their sensitivity to high-redshift structures and becoming robust to low-redshift modelling. This is achieved by subtracting appropriately scaled galaxy density maps, effectively nulling the low-redshift structure through a model-insensitive procedure similar to delensing. This results in a high-redshift-only mass map that can uniquely probe the growth of structure at very high redshifts while also providing powerful constraints on neutrino mass.
