Behaviour of Brans-Dicke parameter in generalised chameleon cosmology with Kantowski-Sachs space-time

In this paper we consider chameleonic generalized Brans-Dicke cosmology in the framework of Kantwoski-Sacks universes. We investigate the time dependence of the Brans-Dicke parameter ω ( t ) for an expanding Universe, and obtain an explicit dependence of ω ( t ) in different expansion phases of the...

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Bibliographic Details
Published in:European physical journal plus 2014-12, Vol.129 (12), p.275, Article 275
Main Authors: Satish, J., Venkateswarlu, R.
Format: Article
Language:English
Subjects:
Applied and Technical Physics
Atomic
Complex Systems
Condensed Matter Physics
Cosmology
Deceleration
Mathematical and Computational Physics
Molecular
Optical and Plasma Physics
Parameters
Physics
Physics and Astronomy
Regular Article
Theoretical
Time dependence
Universe
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Summary:In this paper we consider chameleonic generalized Brans-Dicke cosmology in the framework of Kantwoski-Sacks universes. We investigate the time dependence of the Brans-Dicke parameter ω ( t ) for an expanding Universe, and obtain an explicit dependence of ω ( t ) in different expansion phases of the Universe. Here we take the power law form of the scale factor. The behaviour of ω ( t ) is studied for matter-dominated, vacuum-energy-dominated universe, radiation-dominated and mass-less scalar-field-dominated era. It is also proposed to study the nature of the deceleration parameter.
ISSN:2190-5444
2190-5444
DOI:10.1140/epjp/i2014-14275-y