Gauss-Bonnet dark energy

Details Gauss-Bonnet dark energy Gauss-Bonnet dark energy

2005-04-06

arxiv.org/abs/hep-th/0504052v2

Phys.Rev.D71:123509,2005

Physics

High Energy Physics

High Energy Physics - Theory

LaTeX file, 9 pages, some revision/errors corrected

Scientific paper

10.1103/PhysRevD.71.123509

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 $w=-1$ 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.

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