Gauss-Bonnet dark energy
Abstract
We propose the Gauss-Bonnet dark energy model inspired by string/M-theory where standard gravity with scalar contains additional scalar-dependent coupling with Gauss-Bonnet invariant. It is demonstrated that effective phantom (or quintessence) phase of late universe may occur in the presence of such term when the scalar is phantom or for non-zero potential (for canonical scalar). However, with the increase of the curvature the GB term may become dominant so that phantom phase is transient and barrier may be passed. Hence, the current acceleration of the universe may be caused by mixture of scalar phantom and (or) potential/stringy effects. It is remarkable that scalar-Gauss-Bonnet coupling acts against the Big Rip occurence in phantom cosmology.
Cite
@article{arxiv.hep-th/0504052,
title = {Gauss-Bonnet dark energy},
author = {Shin'ichi Nojiri and Sergei D. Odintsov and Misao Sasaki},
journal= {arXiv preprint arXiv:hep-th/0504052},
year = {2009}
}
Comments
LaTeX file, 9 pages, some revision/errors corrected