Crossing the Phantom Divide Line in a DGP-Inspired $F(R,\phi)$-Gravity

TL;DR

This paper investigates a DGP-inspired $F(R,)$ braneworld model where a scalar field and curvature effects unify, demonstrating conditions under which the universe's late-time acceleration can cross the phantom divide line.

Contribution

It introduces a specific $F(R,)$ form and an ansatz that enable crossing of the phantom divide line within a DGP-inspired framework.

Findings

Identifies parameter regions for late-time acceleration

Shows crossing of the phantom divide line is possible

Provides a unified scalar-curvature model for cosmic acceleration

Abstract

We study possible crossing of the phantom divide line in a DGP-inspired $F(R,\phi)$ braneworld scenario where scalar field and curvature quintessence are treated in a unified framework. With some specific form of $F(R,\phi)$ and by adopting a suitable ansatz, we show that there are appropriate regions of the parameters space which account for late-time acceleration and admit crossing of the phantom divide line.