Upcoming galaxy surveys will observe enormous cosmological volumes with unprecedented precision; as a result, these surveys hold the promise of cosmological constraints with precision competitive with CMB experiments. On the other hand, current galaxy surveys deliver constraints that show significant tensions with more traditional approaches, in some cases up to 5 sigma (e.g., H0, S8, etc). These tensions may be the result of model shortcomings, systematic effects, or even a missing element in our current understanding of the Universe. To determine the origin of these tensions, it is necessary to utilise the full constraining power that new surveys provide, which requires using more realistic theoretical models and non-traditional cosmological observables.
The primary objective of this session is to discuss the most recent developments in the extraction of statistical information from different types of observables and in modelling techniques to constrain cosmology. The main topics of discussion will be:
Galaxy-halo connection
Perturbation theory and beyond
Machine-learning methods to constrain cosmology
Modelling baryon effects and intrinsic alignments for cosmology
Probes beyond the 2-point statistics
Cosmological constraints from the non-linear regime
Constraining alternative gravity and cosmological models