Summary:

In this talk I will discuss the main motivations to explore theories of gravity beyond General Relativity. In particular, I will focus on the popular class of scalar-tensor theories, discussing their formulation and how to parametrise them efficiently on a cosmological background. This framework is optimal to describe large class of models at once, which makes it ideal to test deviations from the standard cosmological model. I will discuss some of the main results in the literature, as well as the tools available to compare cosmological data with theoretical predictions. I shall focus mostly on hi_class, an Einstein-Boltzmann solver optimised for beyond-Horndeski models. Finally, I will speculate about the future of alternative theories of gravity and show what we can realistically expect from the next generation of surveys.

For more information please contact Lavalle J.