20May 2017

A STUDY OF THE TIME VARIATION OF BRANS-DICKE PARAMETER (ω)

  • Department of Physics, St. Xavier?s College, Kolkata.30 Mother Teresa Sarani (Park Street), Kolkata ? 700016, West Bengal, India.
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The explicit dependence of the dimensionless Brans-Dicke (BD) parameter (ω) upon time and also upon the equation of state (EoS) parameter (γ) has been determined, by solving BD field equations for a space of zero curvature and also the wave equation for the scalar field (φ). Empirical expressions of the scale factor and the scalar field have been used for this purpose. Dependence of the present value of the BD parameter (ω_0) upon a parameter controlling the time variation of the scalar field has been obtained and shown graphically. Time variation of the BD parameter, for different values of the EoS parameter, characterizing cosmological eras, has been depicted graphically.

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[Sudipto Roy. (2017); A STUDY OF THE TIME VARIATION OF BRANS-DICKE PARAMETER (ω) Int. J. of Adv. Res. 5 (May). 589-597] (ISSN 2320-5407). www.journalijar.com

Sudipto Roy
Department of Physics, St. Xavier’s College, Kolkata

DOI:

Article DOI: 10.21474/IJAR01/4149      
DOI URL: https://dx.doi.org/10.21474/IJAR01/4149

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