Journal ArticleDOI
Behaviour of Brans-Dicke parameter in generalised chameleon cosmology with Kantowski-Sachs space-time
J. Satish,R. Venkateswarlu +1 more
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In this article, the authors considered chameleonic generalized Brans-Dicke cosmology in the framework of Kantwoski-Sacks universes and investigated the time dependence of the Brans Dicke parameter ω(t) for an expanding universe.Abstract:
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.read more
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Time evolution of the matter content of the expanding universe in the framework of Brans-Dicke gravity
TL;DR: In this article, a cosmological model has been constructed in the framework of Brans-Dicke (BD) gravity, based on an interconversion between matter and dark energy, for a spatially flat universe in the era of pressureless dust.
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Bulk viscous fluid cosmological models in f(R, T) gravity
J. Satish,R. Venkateswarlu +1 more
TL;DR: In this article, the authors considered that the function f(R, T) as f (R, T) = R + 2 f (T ) or f ( R, T ) = f 1 ( R ) + f 2 ( T ) is an evolving effective cosmological constant, which depends on the stress energy tensor.
Journal ArticleDOI
Time Evolution of the Matter Content of the Expanding Universe in the Framework of Brans-Dicke Gravity
TL;DR: In this paper, a cosmological model has been constructed in the framework of Brans-Dicke (BD) gravity, based on an interconversion between matter and dark energy, for a spatially flat universe in the era of pressureless dust.
Journal ArticleDOI
Some Bianchi Type Viscous Holographic Dark Energy Cosmological Models in the Brans–Dicke Theory
TL;DR: In this paper , Bianchi type II, VIII, and IX spatially homogeneous and anisotropic space-times in the background of the Brans-Dicke theory of gravity within the framework of viscous holographic dark energy were analyzed.
References
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Journal ArticleDOI
Extended inflationary cosmology
Daile La,Paul J. Steinhardt +1 more
TL;DR: A new type of inflationary scenario based on metric formulations of gravity different from that of Einstein, e.g., Brans-Dicke theory of gravity is presented, which can be completed via bubble nucleation and fine tuning of an effective potential to obtain a slow-rollover transition.
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Nonminimal coupling and quintessence
Orfeu Bertolami,P. J. Martins +1 more
TL;DR: In this paper, the authors analyzed the conditions under which the dynamics of a self-interacting Brans-Dicke field can account for the accelerated expansion of the universe.
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Cosmic acceleration without quintessence
Narayan Banerjee,Diego Pavón +1 more
TL;DR: In this article, it is argued that Brans-Dicke theory may explain the present accelerated expansion of the universe without resorting to a cosmological constant or quintessence matter.
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Cosmography and constraints on the equation of state of the Universe in various parametrizations
TL;DR: In this article, a Monte Carlo Markov chain analysis is used to compare the supernova Ia Union 2 compilation, combined with the Hubble Space Telescope measurements of the Hubble constant, and the Hubble parameter data sets.
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Varying alpha in a more realistic Universe
David F. Mota,John D. Barrow +1 more
TL;DR: In this paper, the authors study the space-time evolution of the fine structure constant, α, inside evolving spherical overdensities in a lambda-CDM Friedmann universe using the spherical infall model.