The standard Cold Dark Matter (CDM) paradigm of structure
formation has proven to be extremely powerful in predicting the evolution and
formation of the structure we see in the Universe. However, the yet undetected dark
matter particles and some tension between simulations and observations have made the
investigation of alternative models a powerful and necessary tool to improve the
understanding of the Universe dynamics.
In this talk I will consider an extension of the CDM model in which a dark fluid
becomes non-minimally coupled to gravity at recent times (z<10) and investigate its
cosmological consequences. In particular I will present the effects of this coupling
when translated into an Einstein Frame on both background cosmology and linear
perturbations.