Dark energy from scalar field with Gauss Bonnet and non-minimal kinetic coupling

Details Dark energy from scalar field with Gauss Bonnet and non-minimal kinetic coupling Dark energy from scalar field with Gauss Bonnet and non-minimal kinetic coupling

2011-08-31

arxiv.org/abs/1108.6236v1

Physics

High Energy Physics

High Energy Physics - Theory

21 pages

Scientific paper

10.1142/S0217732312500186

We study a model of scalar field with a general non-minimal kinetic coupling to itself and to the curvature, and additional coupling to the Gauss Bonnet 4-dimensional invariant. The model presents rich cosmological dynamics and some of its solutions are analyzed. A variety of scalar fields and potentials giving rise to power-law expansion have been found. The dynamical equation of state is studied for two cases, with and without free kinetic term . In both cases phenomenologically acceptable solutions have been found. Some solutions describe essentially dark energy behavior, and and some solutions contain the decelerated and accelerated phases.

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