Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2005-10-14
Phys.Lett. B638 (2006) 94-99
Physics
High Energy Physics
High Energy Physics - Theory
6 pages, 3 figures, version in PLB
Scientific paper
10.1016/j.physletb.2006.05.050
In recent years different explanations are provided for both an inflation and a recent acceleration in the expansion of the universe. In this Letter we show that a model of physical interest is the modification of general relativity with a Gauss-Bonnet term coupled to a dynamical scalar-field as predicted by certain versions of string theory. This construction provides a model of evolving dark energy that naturally explains a dynamical relaxation of the vacuum energy (gravitationally repulsive potential) to a small value (exponentially close to zero) after a sufficient number of e-folds. The model also leads to a small deviation from the $w=-1$ prediction of non-evolving dark energy.
Carter Benedict M. N.
Neupane Ishwaree P.
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