Resummation methods in cosmological perturbation theory: next to leading computations

by Mr Stefano Anselmi (Padova University)

Thursday 24 Feb 2011, 16:00 → 17:30 Europe/Brussels

E/3rd floor-E.349 - Seminar room (E.349) (Marc de Hemptinne (chemin du Cyclotron, 2, Louvain-la-Neuve))

One of the most interesting challenges of present cosmology concerns the understanding of structure formation and evolution. Relevant physical information is encoded in scales smaller than O(100 Mpc), where the structures are more clustered and perturbation theory breaks down. Therefore, in order to accurately describe the relevant observables, different semi-analytical approaches to the problem have appeared in the last years. In this context the non-linear propagator gains a fundamental role. It represents the cross-correlation between the final density, or velocity, perturbations and the initial ones. We will discuss how to compute the non-linear propagator including a larger class of perturbative corrections which are neglected in other analytic re-summations.