Dark spinors with torsion in cosmology

TL;DR

This paper introduces a matter source in Einstein-Cartan theory compatible with cosmology, showing it leads to accelerated expansion and torsion decay, aligning with standard cosmological models.

Contribution

It identifies a natural matter source with compatible spin tensor in Einstein-Cartan theory and analyzes its cosmological implications.

Findings

Accelerated expansion acts as an attractor in the model

Torsion field decays rapidly during acceleration

Results align with standard cosmological model

Abstract

We solve one of the open problems in Einstein-Cartan theory, namely we find a natural matter source whose spin angular momentum tensor is compatible with the cosmological principle. We analyze the resulting evolution equations and find that an epoch of accelerated expansion is an attractor. The torsion field quickly decays in that period. Our results are interpreted in the context of the standard model of cosmology.