Effective theory of dark energy on redshift survey scales

There are currently so many dark energy scenarios, each leading to a different phenomenology, that it will be hard 
to compare their predictions with the observations of future surveys. I will review a unifying approach to describe dark 
energy and modified gravity models based on a single scalar field and allowing different matter species to couple 
differently to the gravitational sector. Restricting to the quasi-static approximation, I will discuss the constraining power 
of a future redshift survey with Euclid-like characteristics on the parameters of such description, in the case when cold 
dark matter is non-trivially coupled to the gravitational sector.