Crossing of $\omega=-1$ with Tachyon and Non-minimal Derivative Coupling

TL;DR

This paper introduces a scalar field model with non-minimal derivative coupling to curvature, demonstrating that quantum corrections enable crossing the phantom divide line, which is typically impossible in single scalar field models.

Contribution

The study shows that non-minimal derivative coupling with curvature allows phantom divide crossing in a single scalar field model, incorporating quantum corrections.

Findings

Quantum corrections enable phantom divide crossing.

Non-minimal derivative coupling affects cosmological dynamics.

Single scalar field models can exhibit phantom crossing with these modifications.

Abstract

We construct a single scalar field model with tachyon field non-minimally coupled to itself, its derivative and to the curvature. We study the cosmological dynamics of the equation of state in this setup. While it is expected that in the case of single scalar field the crossing of the phantom divide line can not be realized [10], we show that incorporating quantum corrections, namely, non-minimal derivative coupling of scalar field with curvature in our model, lead to phantom divide crossing.