An exploration of physics beyond the standard model with next generation cosmological observations

par Dr Santiago Casas (TTK, RWTH Aachen University)

jeudi 9 févr. 2023, 11:00 → 12:00 Europe/Paris

Petit Amphi/salle Sommets (Lapth)

Within this decade we will have access to an unprecedented amount of cosmological data coming from different sources, that cover from radio to optical, to multi-messenger astrophysics. These will allow us to test our standard model of cosmology  (and fundamental physics) to a precision like never imagined before. In this talk I will give an overview of the current theoretical status of models beyond LCDM, mainly focused on the Dark Energy problem, but I will also give a short excursion into Inflation and Neutrino Physics amid the current tensions showing cracks in our current theoretical foundations. Large scale structure data will become the new precision cosmology tool for this decade, improving in some cases over the current Cosmic Microwave Background constraints. Most of the statistical power will be coming from optical experiments such as Euclid, Vera Rubin (LSST), Nancy Roman (WFIRST) and DESI. However, we will show that the cross-correlation with other sources, for example with powerful Radio observatories such as SKAO, can be helpful to break degeneracies and remove systematics. I will present efforts to forecast these constraints with current tools and explain the development of statistical methods to explore the complexity of the likelihoods. As we will see, in order to reach the 
so-called high-precision cosmological limit and rule most of the still-allowed parameter space of theories, there are still huge challenges to be solved, especially in the non-linear and non-Gaussian regimes. These challenges will require new ideas in terms of theoretical modelling, computational efficiency, machine learning and data analysis.