The Effective Field Theory approach to gravitation on cosmological scales
One of the major challenges in modern cosmology is to explain the phenomenon of cosmic acceleration.
Thanks to the enormous amount of precise data that have been gathered and will be provided by cosmological surveys it will soon be possible to discriminate between competing models.
I will discuss the relevance of the Effective Field Theory (EFT) approach in testing modified gravity and dark energy models that aim at solving the problem of cosmic acceleration. In particular I will briefly review the EFT construction and its implementation into the Einstein-Boltzmann solver EFTCAMB that is publicly available and can be used to test a wide range of models against cosmological observations. I will then comment on the theories that have been recently studied with this tool and the corresponding observational constraints. .