On f(R) gravity
arXiv:1406.4090
Abstract
A review of the new of the problem of dark energy using modified gravity approach is considered. An explanation of the difficulties facing modern cosmology is given and different approaches are presented. We show why some models of gravity may suffer of instabilities and how some are inconsistent with observations.
5 pages, 0 figuers. arXiv admin note: text overlap with arXiv:1401.0046 by other authors