Modified gravity as realistic candidate for dark energy, inflation and   dark matter
  We review the unification of early-time inflation with late-time acceleration in several local modified gravity models which pass Solar System and cosmological tests. It is also demonstrated that account of non-local gravitational corrections to the action does not destroy the possibility of such unification. Dark matter effect is caused by composite graviton degree of freedom in such models. 
Shin'ichi Nojiri and Sergei D. Odintsov