Consequences of a Cosmic Scalar with Kinetic Coupling to Curvature

Details Consequences of a Cosmic Scalar with Kinetic Coupling to Curvature Consequences of a Cosmic Scalar with Kinetic Coupling to Curvature

2007-08-31

arxiv.org/abs/0709.0009v1

Class.Quant.Grav.24:5573-5580,2007

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

7 pages

Scientific paper

10.1088/0264-9381/24/22/017

The classical gravitational theory of a scalar field with a gradient coupling to the Ricci tensor is examined. This is a scalar-vector-tensor gravitational theory, but in the case that the coupling is weak and the scalar evolves like a quintessence field on cosmological time scales, the field equations within the solar system are similar to a vector-tensor theory predicting tightly-constrained preferred-frame effects. In the early universe, it is shown that strong coupling effects can damp the evolution of the scalar field rolling down a potential to help drive an inflationary epoch. In the absence of a potential, the strong coupling effects drive a coasting expansion epoch which ultimately terminates in a sudden singularity.

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