Sommaire:

Upcoming experiments aim to retrieve highly detailed data of the distribution of matter on the largest cosmological scales, driven by the search for physics beyond the standard models of cosmology and particle physics. For this we need to control and minimise uncertainties in the theoretical modelling which is a challenging task, especially given the non-linearity and complexity of the underlying description. In this context, some of the most limiting theoretical uncertainties are shell-crossing singularities, which are instances with large matter densities that arise when trajectories of collisionless matter intersect. In this talk I provide an overview of recent advances, on both the theoretical/analytical and numerical front, for obtaining fast and accurate shell-crossing predictions.

- CR & Oliver Hahn, Phys. Rev. D 107 (2023) 2, 023515, arXiv:2211.02053
- CR, Shohei Saga, Atsushi Taruya & Stéphane Colombi, PRD accepted, arXiv:2303.12832
- CR, Uriel Frisch & Oliver Hahn, Phys. Rev. Fluids 7 (2022) 10, 104610, arXiv:2207.12416

Pour plus d'informations, merci de contacter Montandon T.