Non-minimal Kinetic coupling to gravity and accelerated expansion

Details Non-minimal Kinetic coupling to gravity and accelerated expansion Non-minimal Kinetic coupling to gravity and accelerated expansion

2009-11-19

arxiv.org/abs/0911.3702v2

Physics

High Energy Physics

High Energy Physics - Theory

17 pages, 1 figure, references added, constraints on time variation of the gravitational coupling added

Scientific paper

We study a scalar field with kinetic term coupled to itself and to the curvature, as a source of dark energy, and analyze the role of this new coupling in the accelerated expansion at large times. In the case of scalar field dominance, the scalar field and potential giving rise to power-law expansion are found in some cases, and a dynamical equation of state is calculated for a given solution of the field equations. A behavior very close to that of the cosmological constant was found.

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