“Cosmology and Fundamental Physics from the three-dimensional Large Scale Structure”
Advances in experimental techniques make it possible to map the high redshift Universe in three dimensions at high fidelity in the near future. This will increase the observed volume by many-fold, while providing unprecedented access to very large scales, which hold key information about early-Universe physics. This will allow us to constrain primordial non-Gaussianity and the shape of the primordial power spectrum to unprecedented levels. In addition, such measurements can directly probe the Dark Energy density in the dark matter domination era, while having the potential to detect percent-level fractional amounts of Early Dark Energy to z ~ 10^5, when the Universe was only a few years old. The precision of these measurements, combined with CMB observations, also has the promise of greatly improving our constraints on the physics of the dark sector, the masses of neutrinos, the amount of spatial curvature and potential modifications to General Relativity. In this talk, I will explain how DESI-II and Stage-5 spectroscopy will address these fundamental questions and open up a new window on the Universe, greatly enhancing the potential for new discoveries.
