Cosmological Acceleration from Gravitational Waves
arXiv:1512.03659
Abstract
It is shown that the classical gravitational waves of super-horizon wavelengths are able to form the de Sitter accelerated expansion of the empty (with no matter fields) Universe. The contemporary Universe is about 70% empty and asymptotically is going to become completely empty, so the effect caused by emptiness should be already very noticeable. It could manifest itself as the dark energy.
This paper has been withdrawn by the author because it was incorporated into arXiv:1508.07312 which is already published