Formation of large-scale structures in some modified-gravity scenarios

Formation of large-scale structures in some modified-gravity scenarios

Scalar fields may play a role in late time cosmology (e.g., be related to the current acceleration of the expansion) but must be screened on small scales or high-density environments to satisfy Solar System constraints. I will discuss a few such models (e.g., dilaton models or K-mouflage scenarios) and describe how the evolution of the background and the formation of large-scale structures are modified as compared with the standard LCDM scenario. In particular, I will present analytical methods that can be applied to study large-scale structures in these scenarios.