Super-acceleration in non-minimal derivative coupling model

TL;DR

This paper investigates a scalar field model with non-minimal derivative coupling to gravity, demonstrating that under certain conditions, it allows crossing the phantom divide line, which is otherwise forbidden.

Contribution

It reveals that with a power law potential and matter, the model enables phantom divide line crossing, a novel finding in non-minimal derivative coupling theories.

Findings

Phantom divide line crossing is possible with matter and potential.

Crossing is forbidden without matter and potential.

The model's behavior depends on specific potential and matter presence.

Abstract

A scalar field model with non-minimal derivative coupling to gravity is considered. It is shown that although in the absence of matter and potential the phantom divide line crossing is forbidden, but for the power law potential and in the presence of matter this crossing is, in principle, possible.