Spinor quintom cosmology with intrinsic spin

TL;DR

This paper develops a spinor quintom dark energy model incorporating intrinsic spin within Einstein-Cartan theory, demonstrating its ability to produce stable cosmic expansion phases and crossing between quintessence and phantom states.

Contribution

It introduces a novel spinor quintom model with intrinsic spin, deriving the energy-momentum tensor and showing how suitable potentials enable crossing between dark energy regimes.

Findings

Model achieves crossing between quintessence and phantom epochs.

Stable expansion phases are realized avoiding Big Rip singularities.

Matter dominated era is stabilized through spinor pressure contributions.

Abstract

We consider a spinor quintom dark energy model with intrinsic spin, in the framework of Eintein- Cartan-Sciama-Kibble theory. After constructing the mathematical formalism of the model, we obtain the spin contributed total energy-momentum tensor giving the energy density and the pressure of the quintom model, and then we find the equation of state parameter in terms of the spinor potential. Choosing suitable potentials leads to the quintom scenario crossing between quintessence and phantom epochs, or vice versa. Analyzed three quintom scenarios provides stable expansion phases avoiding Big Rip singularities, and yielding matter dominated era through the stabilization of the spinor pressure via spin contribution. The stabilization in spinor pressure leads to neglecting it as compared to the increasing energy density, and constituting a matter dominated stable expansion epoch.