Exploring the dark side of the Universe in a dilatonic brane-world scenario

TL;DR

This paper investigates how a dilatonic brane-world model can explain late-time cosmic acceleration, including phantom-like behavior and crossing the cosmological constant line, without requiring phantom matter.

Contribution

It introduces a dilatonic brane-world scenario with induced gravity that naturally produces dark energy effects and crossing behavior without exotic matter.

Findings

Achieves phantom-like acceleration safely

Demonstrates crossing of the cosmological constant line

Models dark energy via brane tension and dilaton field

Abstract

We describe the late-time acceleration of the Universe within the paradigm of the brane-world scenario. More precisely, we show how a phantom-like behaviour or a crossing of the cosmological constant line can be achieved safely in a dilatonic brane-world model with an induced gravity term on the brane. The brane tension plays the role of dark energy which is coupled to the dilaton bulk scalar field. The phantom mimicry as well as the crossing of the cosmological constant line are achieved without invoking any phantom matter either on the brane or in the bulk.