Dark Energy Model with Spinor Matter and Its Quintom Scenario

TL;DR

This paper introduces a Spinor Quintom dark energy model using a nontraditional spinor potential, capable of crossing the cosmological constant boundary without ghosts and mimicking Chaplygin gas behavior.

Contribution

It presents a novel spinor field-based dark energy model that achieves EoS crossing -1 without ghosts and reproduces Chaplygin gas dynamics.

Findings

Model allows EoS to cross -1 boundary.

Mimics Chaplygin gas during evolution.

Realizes Quintom scenario with spinor fields.

Abstract

A class of dynamical dark energy models, dubbed Spinor Quintom, can be constructed by a spinor field $\psi$ with a nontraditional potential. We find that, if choosing suitable potential, this model is able to allow the equation-of-state to cross the cosmological constant boundary without introducing any ghost fields. In a further investigation, we show that this model is able to mimic a perfect fluid of Chaplygin gas with $p=-c/\rho$ during the evolution, and also realizes the Quintom scenario with its equation-of-state across -1.