https://doi.org/10.1140/epjp/i2012-12023-1
Regular Article
Chamelionic generalized Brans-Dicke cosmology
1
Key Laboratory of Numerical Simulation of Sichuan Province, 641112, Sichuan, China
2
College of Mathematics and Information Science, Neijiang Normal University, 641112, Sichuan, China
* e-mail: nabulsiahmadrami@yahoo.fr
Received:
17
November
2011
Revised:
29
January
2012
Accepted:
1
February
2012
Published online:
21
February
2012
We discuss the late-time dynamics of a chameleonic generalized Brans-Dicke cosmology with the power law chameleonic function f (φ) ∝ φ n , where n is a real parameter motivated from string theories by conjecturing that the four-dimensional Hubble parameter varies with a scale factor like φ = ξa m , where (ξ, m) are real parameters. For some critical values of m, n and the Brans-Dicke parameter, it was observed that the universe is free from the initial singularity. Both singularity-free and singular cosmological scenarios are discussed. Several cosmological tests like the physical cosmological distances and the statefinder parameters are discussed.
© Società Italiana di Fisica and Springer, 2012
