An Investigation into LRS Bianchi I Universe in Brans-Dicke Theory

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Journal of New Theory
Issue:44
An Investigation into LRS Bianchi I Universe in Brans-Dicke Theory

An Investigation into LRS Bianchi I Universe in Brans-Dicke Theory

Pages : 87-96

View : 41 | Download : 30

Publication Date : 2023-09-30

Article Type : Research Paper

Abstract :In this study, the homogenous and anisotropic locally rotationally symmetric insert ignore into journalissuearticles values(LRS); Bianchi type-I universe filled with the bulk viscous and the string cloud matter has been investigated in the Brans-Dicke insert ignore into journalissuearticles values(BD); scalar-tensor theory. The modified Einstein field equations of the constructed model have been solved by using the relation of the scale factors $A=B^m$ and considering the deceleration parameter to be $q=m-1$. It is found that the string does not survive for the model due to the obtained zero string energy density insert ignore into journalissuearticles values($\\rho_s=0$); and agrees with some studies in recent years. Moreover, it is possible to say that string matter may be turned into phantom energy over time, depending on the obtained negative rest energy density of the matter. When BD scalar field $\\Phi$ is assumed constant, the attained solutions are reduced to General Relativity insert ignore into journalissuearticles values(GR); solutions for the static vacuum. Thus, the constructed model has not allowed the reduction of the BD solutions to GR solutions, including the matter distributions. In addition, some expansion models for choosing a value of constant $m$ have been obtained and provided. All the results have been analyzed in detail.
Keywords : LRS Bianchi I universe, Brans Dicke theory, bulk viscous, string cloud, deceleration parameter

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