An interacting scalar field and the recent cosmic acceleration

TL;DR

This paper demonstrates that the Brans-Dicke scalar field, with energy transfer from dark matter, can explain both early deceleration and late-time acceleration of the universe without additional quintessence fields.

Contribution

It introduces a model where the Brans-Dicke scalar field alone accounts for cosmic acceleration phases through interaction with dark matter.

Findings

Scalar field causes early deceleration

Scalar field causes late-time acceleration

Interaction enables unified cosmic acceleration explanation

Abstract

In this paper it is shown that the Brans - Dicke scalar field itself can serve the purpose of providing an early deceleration and a late time acceleration of the universe without any need of quintessence field if one considers an interaction, i.e, transfer of energy between the dark matter and the Brans - Dicke scalar field.