Generalized Brans-Dicke theories

Details Generalized Brans-Dicke theories Generalized Brans-Dicke theories

2010-05-06

arxiv.org/abs/1005.0868v2

JCAP 1007:024,2010

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

14 pages, 4 figures, version to appear in JCAP

Scientific paper

10.1088/1475-7516/2010/07/024

In Brans-Dicke theory a non-linear self interaction of a scalar field allows a possibility of realizing the late-time cosmic acceleration, while recovering the General Relativistic behavior at early cosmological epochs. We extend this to more general modified gravitational theories in which a de Sitter solution for dark energy exists without using a field potential. We derive a condition for the stability of the de Sitter point and study the background cosmological dynamics of such theories. We also restrict the allowed region of model parameters from the demand for the avoidance of ghosts and instabilities. A peculiar evolution of the field propagation speed allows us to distinguish those theories from the LCDM model.

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