Cosmological Model with Cosmic transit behaviour in Brans-Dicke Theory

TL;DR

This paper develops a dark energy cosmological model within generalized Brans-Dicke theory, incorporating a unified dark fluid and a time-varying deceleration parameter to simulate cosmic transition, constrained by observational data.

Contribution

It introduces a novel cosmological model with a dynamic deceleration parameter in Brans-Dicke theory, analyzing its behavior with observational constraints.

Findings

Model successfully simulates cosmic transit behavior.

Constraints on Brans-Dicke parameter and scalar field from $H(z)$ data.

Demonstrates viability of unified dark fluid in this framework.

Abstract

We have constructed a dark energy cosmological model in the framework of generalized Brans Dicke theory (GBD) with a self-interacting potential. The source of dark energy is considered through a unified dark fluid (UDF) characterized by a linear equation of state (EoS). A time varying deceleration parameter simulating the cosmic transit behaviour has been introduced to get the dynamical behaviour of the model. The $H(z)$ data have been explored to constrain the model parameters and to study the dynamical aspects of the Brans-Dicke parameter and the scalar field.