Roy, Sudipto and Nandi, Dipika and Ghosh, Sumana and Das, Apashanka (2018) Time Evolution of Density Parameters for Matter and Dark Energy and their Interaction Term in Brans-Dicke Gravity. [Preprint]
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Abstract
In the framework of Brans-Dicke (BD) theory, the first part of the present study determines the time dependence of BD parameter, energy density and equation of state (EoS) parameter of the cosmic fluid in a universe expanding with acceleration, preceded by a phase of deceleration. For this purpose, a scale factor has been chosen such that the deceleration parameter, obtained from it, shows a signature flip with time. Considering the dark energy to be responsible for the entire pressure, the time evolution of energy parameters for matter and dark energy and the EoS parameter for dark energy have been determined. An effective interaction term, between matter and dark energy, has been proposed and calculated. Its negative value at the present time indicates conversion of matter into dark energy. Using this term, the time dependence of the rates of change of matter and dark energy has been determined. It is found that the nature of dependence of the scalar field upon the scale factor plays a very important role in governing the time evolution of the cosmological quantities studied here. The present study provides us with a simple way to determine the time evolution of dark energy for a homogeneous and isotropic universe of zero spatial curvature, without involving any self-interaction potential or cosmological constant in the formulation.
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| Item Type: | Preprint | |||||||||||||||
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| Keywords: | Brans-Dicke Gravity, Cosmological Parameters, Dark Energy, Matter-Dark Energy Interaction Term. | |||||||||||||||
| Subjects: | Specific Sciences > Physics > Cosmology Specific Sciences > Physics Specific Sciences > Physics > Relativity Theory |
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| Depositing User: | Dr. Sudipto Roy | |||||||||||||||
| Date Deposited: | 21 May 2018 18:13 | |||||||||||||||
| Last Modified: | 21 May 2018 18:13 | |||||||||||||||
| Item ID: | 14694 | |||||||||||||||
| Subjects: | Specific Sciences > Physics > Cosmology Specific Sciences > Physics Specific Sciences > Physics > Relativity Theory |
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| Date: | 19 May 2018 | |||||||||||||||
| URI: | https://philsci-archive.pitt.edu/id/eprint/14694 |
Available Versions of this Item
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Time Evolution of Energy Density, EoS Parameter and the Density Parameters for Matter and Dark Energy
in Brans-Dicke Gravity. (deposited 26 Apr 2018 12:03)
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Time Evolution of Density Parameters for Matter and Dark Energy and their Interaction Term in Brans-Dicke Gravity. (deposited 07 May 2018 14:07)
- Time Evolution of Density Parameters for Matter and Dark Energy and their Interaction Term in Brans-Dicke Gravity. (deposited 21 May 2018 18:13) [Currently Displayed]
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Time Evolution of Density Parameters for Matter and Dark Energy and their Interaction Term in Brans-Dicke Gravity. (deposited 07 May 2018 14:07)
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