Dark energy with dark spinors

TL;DR

This paper proposes a dark spinor field model that explains the universe's accelerated expansion, allowing the equation of state to cross the phantom divide without instabilities or singularities, aligning with some experimental data.

Contribution

It introduces a novel dark spinor field theory that achieves crossing of the phantom divide safely, avoiding ghosts and singularities, and provides a viable dark energy candidate.

Findings

The dark spinor model crosses the phantom divide without instabilities.

It converges to dark energy avoiding the big rip.

The model aligns with experimental data favoring crossing of the phantom divide.

Abstract

Ever since the first observations that we are living in an accelerating universe, it has been asked what dark energy is. There are various explanations all of which with have various draw backs or inconsistencies. Here we show that using a dark spinor field it is possible to have an equation of state that crosses the phantom divide, becoming a dark phantom spinor which evolves into dark energy. This type of equation of state has been mildly favored by experimental data, however, in the past there were hardly any candidate theories that satisfied this crossing without creating ghosts or causing a singularity which results in the universe essentially ripping. The dark spinor model converges to dark energy in a reasonable time frame avoiding the big rip and without attaining negative kinetic energy as it crosses the phantom divide.