Chamelionic generalized Brans-Dicke cosmology

被引：0
作者：
R. A. El-nabulsi
机构：
[1] Key Laboratory of Numerical Simulation of Sichuan Province,College of Mathematics and Information Science
[2] Neijiang Normal University,undefined
来源：
The European Physical Journal Plus | / 127卷
关键词：
Vertical Axis; Dark Energy; Deceleration Parameter; Weak Energy Condition; Phantom Energy;
D O I：
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摘要：
We discuss the late-time dynamics of a chameleonic generalized Brans-Dicke cosmology with the power law chameleonic function f (φ) ∝ φn, 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 = ξam, 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.
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