Modified Gravity Phenomenology: overview and recent advancements
Tuesday 04 October 2016
to 14:30 at
Valentina Salvatelli (Centre de Physique Théorique Marseille)
Despite the success of General Relativity (GR) on Solar System tests, our knowledge of gravity on galactic and cosmological scales is still limited. Additionally a revision of GR on cosmological scales may explain the nature of the late-time acceleration of the universe. Probing gravity theories on large scales is therefore one of the most crucial and timely challenge for cosmologists. Some interesting results in this field have been found by recent experiments, like PLANCK, and complimentary and more precise tests will be enabled by the vast amount of astronomical surveys that will be realized in the next few years.
In this context the search for efficient parametrizations, that allow a simultaneous test of a broad class of gravity models, is decisive to succeed in the goal of testing extensions of GR by using cosmological data. In this talk I will summarize the state-of-the-art about cosmological constraints on gravity, I will present the pros and cons of using the Effective Field Theory of Dark Energy (EFT) as compact framework to explore gravity theories and I will show some compelling results that we can obtain by combining the cosmic microwave background observations with the EFT formalism.
(host: Martina Gerbino)