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

TL;DR

This paper explores a Bianchi type I universe model in Brans-Dicke gravity with a hybrid scalar field, analyzing its evolution, dark energy interaction, and observational consistency, revealing a quintessence-like behavior.

Contribution

It introduces an explicit scalar field solution in Bianchi I spacetime within Brans-Dicke theory and investigates its observational viability and dark energy properties.

Findings

The universe exhibits dynamical dark energy with _{de} > -1.

Model fits observational Hubble data well.

Universe behaves like a quintessence model at present.

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 $\phi = \phi_{0}\left[t^{\alpha}exp(\beta t)\right]^{\delta}$ with $\phi_{0}$, $\alpha$, $\beta$ and $\delta$ as constants. The values of $\alpha$ and $\beta$ 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 $\omega_{de} > -1$. Hence the Universe behaves like a quintessence model at present epoch. Some physical properties of the Universe are also discussed.