Nonlinear Spinors as the Candidate of Dark Matter

TL;DR

This paper explores nonlinear spinor gases as a potential unified candidate for dark matter and dark energy, providing a theoretical framework that explains negative pressure and the cosmological constant in cosmology.

Contribution

It introduces a new equation of state for nonlinear spinor gases and suggests their role in explaining dark matter, dark energy, and the cosmological constant.

Findings

Equation of state w(a) less than or approximately -1 in early universe

Nonlinear spinor gases can produce negative pressure

Potential link between nonlinear spinors and cosmological constant

Abstract

In this paper, we discuss the equation of state for nonlinear spinor gases in the context of cosmology. The mean energy momentum tensor is similar to that of the prefect fluid, but an additional function of state $W$ is introduced to describe the nonlinear potential. The equation of state $w(a)\lesssim -1$ in the early universe is calculated, which provides a natural explanation for the negative pressure of dark matter and dark energy. $W$ may be also the main origin of the cosmological constant $\Lambda$. So the nonlinear spinor gases may be a candidate for dark matter and dark energy.