Exploring the Origin of Cosmic Structures

par Matteo Biagetti (IFPU/SISSA Trieste)

jeudi 26 janv. 2023, 11:00 → 12:00 Europe/Paris

Salle des Sommets (Lapth)

Since the dawn of civilization, cultures have searched for answers about essential properties of the Universe on large scales, to understand its origin, evolution, and fate. In the current cosmological paradigm, the Λ Cold Dark Matter (ΛCDM) model, these properties are described by a small set of numbers determining the amount of matter, the expansion rate, and the initial conditions for the formation of structures. Despite the simplicity of the model, there is little understanding of its components. What is causing a recent accelerated expansion in the Universe? What is the nature of dark matter? Similarly, our model of how structures were formed at the origins of the universe is mostly phenomenological, and any progress in this direction would bring knowledge not only of the cosmological model itself, but also of fundamental forces and particles at very high energies. In this landscape, current and forthcoming galaxy redshift surveys such as BOSS, DESI, Euclid, SPHEREx and LSST show strong potential to shed light on these issues. These surveys observe angular positions and redshifts of galaxies across large cosmological volumes, allowing us to trace the distribution of matter as a function of time. In this talk, I will present new (and established) methods and strategies that are pivotal to fully exploit forthcoming data and shed light on the fundamental physics behind our cosmological model.