We consider a new modified gravity model with nonlocal term of the form R−1F(□)R. This kind of nonlocality is motivated by investigation of applicability of a few unusual ans\"atze to obtain some exact cosmological solutions. In particular, we find attractive and useful quadratic ansatz □R=qR2.
@article{arxiv.1411.5034,
title = {A New Model of Nonlocal Modified Gravity},
author = {Ivan Dimitrijevic and Branko Dragovich and Jelena Grujic and Zoran Rakic},
journal= {arXiv preprint arXiv:1411.5034},
year = {2014}
}