Letter to the Editor
Modified Gauss-Bonnet-Brans-Dicke cosmology with freezing scalar potentials
Rami Ahmad El-Nabulsi
; College of Mathematics and Information Science, Qujing Normal University, Qujing, Yunnan 655011, PR China
Abstract
In this letter, we discuss the late-time dynamics of a modified Gauss-Bonnet gravity theory `a la Brans-Dicke, dominated by freezing potentials V (φ) ∝ φ −n, n ∈ R. For a certain choice of the parameter n, it is observed that the universe is dominated by dark energy, accelerated in time and controlled by the Gauss-Bonnet invariant term. Besides, the Brans-Dicke parameter ω ≫ 1 compatible with some recent reports where this bound is updated by several thousands following from the bound on “˜γ − 1” from the Cassini mission, ˜γ being the PPN parameter. Many additional interesting features are raised and discussed in some details.
Keywords
modified Gauss-Bonnet gravity; dark energy; scaling solutions; accelerated expansion
Hrčak ID:
304605
URI
Publication date:
1.9.2010.
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