Cosmological acceleration from a gas of strings
arXiv:0907.1342 · doi:10.1016/j.nuclphysbps.2009.07.039
Abstract
In string gas cosmology, the extra dimensions of the underlying theory are kept at a microscopic scale by a gas of strings. In the matter-dominated era, however, dust pressure can lead to oscillations of the extra dimensions and to acceleration in the three visible dimensions, even with a vanishing cosmological term. We review the resulting oscillating expansion history, that provides an acceptable fit to the observed accelerated expansion of the Universe.
6 pages, 2 figures. Proceedings of the GGI Dark Matter and Dark Energy conference