Speaker
Description
The standard ΛCDM model has been remarkably successful, but it has recently being challenged by several tensions. The combination of galaxy surveys and CMB lensing is a powerful probe of the large-scale structure and a key tool for testing the ΛCDM model in the era of next-generation experiments. Upcoming galaxy surveys such as the Legacy Survey of Space and Time (LSST) and Euclid, together with CMB experiments such as the Simons Observatory (SO) and LiteBIRD, will dramatically improve the volume of available data. This will enable not only tighter constraints from two-point statistics, but also high signal-to-noise measurements of higher-order statistics such as the bispectrum, which captures non-Gaussian information. The combination of multiple probes (i.e. galaxy clustering, cosmic shear, and CMB lensing) additionally improves parameter constraints and helps break degeneracies. Recent studies have demonstrated the impact of joint power spectrum and bispectrum analyses for subsets of these probes. However, comprehensive studies with combined information from all three tracers are still missing. In this talk, I will discuss the improvement of constraints on cosmological parameters using angular power spectra and bispectra for all possible combinations of the tracers, following a tomographic approach. I will highlight the potential of multi-probe, higher-order analyses for fully exploiting upcoming survey data.