Non-minimally Coupled Quintom Model Inspired by String Theory

TL;DR

This paper proposes a string theory-inspired quintom dark energy model with a non-minimally coupled tachyon scalar field, analyzing conditions for the equation of state to cross the cosmological constant boundary.

Contribution

It introduces a novel non-minimally coupled tachyon-based quintom model inspired by string theory, deriving conditions for EoS crossing -1.

Findings

Derived the EoS for the model

Identified conditions for crossing ω = -1

Analyzed implications of non-minimal coupling

Abstract

In this paper we consider a quintom model of dark energy with a single scalar field $T$ given by a Lagrangian which inspired by tachyonic Lagrangian in string theory. We consider non-minimal coupling of tachyon field to the scalar curvature, then we obtain the equation of state (EoS), and the condition required for the model parameters when $\omega$ crosses over -1.