Unified dark fluid in Brans-Dicke theory

TL;DR

This paper explores anisotropic dark energy models within generalized Brans-Dicke theory, demonstrating how a wet dark fluid and evolving scalar field can produce an accelerating universe without affecting the scalar field's core properties.

Contribution

It introduces anisotropic dark energy models with a wet dark fluid in Brans-Dicke theory, highlighting the role of anisotropy and scalar field dynamics in cosmic acceleration.

Findings

Accelerating expansion achieved with linear Hubble rate relationships.

Anisotropy influences the non-evolving part of the Brans-Dicke parameter.

Scalar field and potential remain unaffected by anisotropic expansion.

Abstract

Anisotropic dark energy cosmological models are constructed in the frame work of generalised Brans-Dicke theory with a self interacting potential. Wet dark fluid characterized by a linear equation of state is considered as the source of dark energy. Shear scalar is considered to be proportional to the expansion scalar simulating an anisotropic relationship among the directional expansion rates. The dynamics of the universe in presence of wet dark fluid in anisotropic background have been discussed. The presence of evolving scalar field makes it possible to get accelerating phase of expansion even for a linear relationship among the directional Hubble rates. It is found that, the anisotropy in expansion rates does not affect the scalar field, self interacting potential but it controls the non-evolving part of the Brans- Dicke parameter.