Transitioning Universe with hybrid scalar field in Bianchi I space-time

Abstract

In this paper we investigate a Bianchi type I transitioning Universe in Brans-Dicke theory. To get an explicit solution of the field equations, we assume scalar field as $\ddot{I}•=\ddot{I}{•}_0{\left[t^{\hat{I}}\pm exp({\hat{I}}^{2}t)\right]}^{\hat{I}}´$ with $\ddot{I}{•}_0$, $\hat{I}\pm$, ${\hat{I}}^2$ and $\hat{I}´$ as constants. The values of $\hat{I}\pm$ and ${\hat{I}}^2$ are obtained by probing the proposed model with recent observational Hubble data (OHD) points. The interacting and non-interacting scenarios between dark matter and dark energy of the derived Universe within the framework of Brans-Dicke gravity are investigated. The $om(z)$ analysis of the Universe in derived model shows that the Universe is filled with dynamical dark energy with its equation of state parameter $\ddot{I}{‰}_{de}>-1$. Hence the Universe behaves like a quintessence model at present epoch. Some physical properties of the Universe are also discussed.

11 pages, 9 figures