Extended holographic Ricci dark energy in chameleon Brans-Dicke cosmology

TL;DR

This paper explores an extended holographic Ricci dark energy model within chameleon Brans-Dicke cosmology, revealing a quintom-like behavior and stronger matter coupling as the universe expands, with reconstructed potential and coupling functions.

Contribution

It introduces a generalized Brans-Dicke framework with non-minimal matter coupling applied to holographic Ricci dark energy, analyzing its effects on cosmological parameters and potential functions.

Findings

BD parameter restrictions derived

Matter-chameleon coupling increases with expansion

EHRDE exhibits quintom-like behavior

Abstract

In the present work we have studied some features of the generalized Brans-Dicke (BD) model in which the scalar field is allowed to couple non-minimally with matter sector. Extended holographic Ricci dark energy (EHRDE) has been considered in the above framework of BD cosmology. Some restrictions have been derived for the BD parameter $\omega$ and a stronger matter-chameleon coupling has been observed with expansion of the universe. In this framework, the equation of state parameter of EHRDE has behaved like quintom. Also, we have reconstructed the potential and coupling function for BD model for the EHRDE. It has been observed that potential function is increasing as the matter-chameleon coupling is getting stronger.