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Measuring lensing ratios with upcoming and future cosmological surveys
José Ramón Bermejo-Climent (INAF OAS)
Tuesday 18/02/2020 @ 14:00, Sala IV piano Battiferro
The cosmic microwave background (CMB) anisotropies and the Large Scale Structure (LSS) tracers are complementary probes for understanding our Universe. Upcoming LSS surveys such as Euclid, LSST and SKA will measure the dark matter distribution with an unprecedented sensitivity, and the combination of these datasets with the CMB information will allow to measure the parameters of cosmological models with better precision. Beyond their combination, it will be possible to extract more information and break degeneracies from the cross-correlation between both probes. In this talk we discuss and show examples of the science that can be done with CMB-LSS cross-correlation. We first discuss how Euclid can measure the so-called lensing ratio, i.e. the ratio between the CMB lensing/galaxy counts and the galaxy shear/galaxy counts cross-correlations. We end up in highlighting how CMB-galaxy clustering cross-correlation can complete a 2D tomographic approach in the perspective of the next cosmological surveys.