of the Standard Model (SM) interactions [@Goenner04] and the formulation of the consistent quantum theory of gravity – both issues still await fully satisfactory solutions. Nevertheless the studies of high energy unification models (string theory, supergravity, effective theories emerging from quantum gravity, brane-world models, extra dimensional models, theories with noncommutative geometries, theories based on deformed Lorentz symmetries) predict deviations from GR at some high energy level and in a lower–energy limit lead to a number of competing effective theories. But can we expect modifications of GR at low energy scale as well? This cannot be excluded: although GR as far has passed safely most of the local weak–field and strong-field astrophysical tests it is well known that it needs an additional hypothetical contribution known as a Dark Matter to explain the galactic and cluster scale observations of the rotation profiles [@Milgrom83],[@TeVeS]. Recently the new motivations has come from cosmology: observations of the Supernovae Type Ia [@Riess2004] and Cosmic Microwave Background radiation anisotropies [@Planck2014] revealed the accelerated expansion of the Universe favoring the $\Lambda$CDM model with another “dark” component dubbed as Dark Energy. It is also well known that modified gravity can play a role in the early–time cosmology. The first 