Spinor dark energy and cosmological coincidence problem

Hao Wei

doi:10.1016/j.physletb.2010.10.053

Abstract

Recently, the so-called Elko spinor field has been proposed to be a candidate of dark energy. It is a non-standard spinor and has unusual properties. When the Elko spinor field is used in cosmology, its unusual properties could bring some interesting consequences. In the present work, we discuss the cosmological coincidence problem in the spinor dark energy models by using the dynamical system method. Our results show that the cosmological coincidence problem should be taken to heart in the investigations of spinor dark energy models.

Highlights

Since the discovery of accelerated expansion of our universe, dark energy has been one of the most active fields in modern cosmology [1,2,3]
The Elko spinor has been proposed to be a candidate of dark energy [27]. This type of dark energy model described by the Elko spinor fields is the one we will discuss in the present work
The so-called Elko spinor field has been proposed to be a candidate of dark energy

Summary

INTRODUCTION

Since the discovery of accelerated expansion of our universe, dark energy has been one of the most active fields in modern cosmology [1,2,3]. In the literature there are relatively few works on the dark energy models with spinor fields. The Elko spinor has been proposed to be a candidate of dark energy [27]. This type of dark energy model described by the Elko spinor fields is the one we will discuss in the present work. It is worth noting that in the present work, we merely consider the spinor dark energy with the correct pressure and energy density given in Eqs. It is worth noting that in the present work, we merely consider the spinor dark energy with the correct pressure and energy density given in Eqs. (6) and (7) [39]

SPINOR DARK ENERGY AND COSMOLOGICAL COINCIDENCE PROBLEM

Dynamical system

Spinor dark energy with a power-law potential

Spinor dark energy with an exponential potential

SUMMARY