Cosmic Evolution in Brans-Dicke Chameleon Cosmology
arXiv:1105.3893 · doi:10.1140/epjp/i2011-11080-2
Abstract
We have investigated the Brans-Dicke Chameleon theory of gravity and obtained exact solutions of the scale factor $a(t)$, scalar field $Ï(t)$, an arbitrary function $f(Ï)$ which interact with the matter Lagrangian in the action of the Brans-Dicke Chameleon theory and potential $V(Ï)$ for different epochs of the cosmic evolution. We plot the functions $a(t)$, $Ï(t)$, $f(t)$ and $V(Ï)$ for different values of the Brans-Dicke parameter. In our models, there is no accelerating solution, only decelerating one with $q>0$. The physical cosmological distances have been investigated carefully. Further the statefinder parameters pair and deceleration parameter are discussed.
To be appear in "The European Physical Journal - Plus (EPJ Plus)",Extended version,15 pages, 17eps figures