2014 Volume 69 Issue 7 Pages 444-452
The observational evidence of dark energy is one of the most serious problems in modern cosmology. From the joint constraints on the dark energy equation of state using the recent data of SN Ia, CMB and BAO, there is a possibility that the gravitational law may be modified from General Relativity at large distances. We review a number of theoretical models of modified gravity which can account for the cosmic acceleration, while recovering the General Relativistic behavior in the solar system. We also discuss the growth of structures in modified gravity models in order to confront them with the observations of galaxy clusterings and weak lensing.