Scalar field descriptions of two dark energy models

We give a scalar field description of two dark energy parametrizations, and we analyze in detail its cosmology both at the level of background evolution and at the level of linear perturbations. In particular, we compute the statefinder parameters and the growth index as functions of the redshift for both dark energy parametrizations, and the comparison with the ΛCDM model as well as with a few well-known geometrical dark energy models is shown. In addition, the combination parameter A=fσ8 of both models is compared against current data.