On the cosmological effects of the Weyssenhoff spinning fluid in the Einstein-Cartan framework

Abstract

The effects of non-Riemannian structures in Cosmology have been studied long ago and are still a relevant subject of investigation. In the seventies, it was discovered that singularity avoidance and early accelerated expansion can be induced by torsion in the Einstein-Cartan theory. In this framework, torsion is not dynamical and is completely expressed by means of the spin sources. Thus, in order to study the effects of torsion in the Einstein-Cartan theory, one has to introduce matter with spin. In principle, this can be done in several ways. In this work we consider the cosmological evolution of the universe in the presence of a constant isotropic and homogeneous axial current and the Weyssenhoff spinning fluid. We analyse possible solutions of this model, with and without the spinning fluid.

arXiv commentWork presented at the 7th Alexander Friedmann International Seminar on Gravitation and Cosmology, Joao Pessoa, Brazil, 29 Jun - 5 Jul 2008. No figures, 5 pages. New version with dynamical equation corrected, new reference and a brief comparison with its experimental bounds

References in corpus (3)

• Physical Aspects of the Space-Time Torsion
• Status of non-Riemannian cosmology
• Cosmological model with macroscopic spin fluid

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• Emergent scenario in the Einstein-Cartan theory
• On the torsion effects of a relativistic spin fluid in early cosmology
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• Emergent Cosmos in Einstein-Cartan Theory
• Energy condition respecting warp drives: The role of spin in Einstein-Cartan theory
• Evolution of the early universe in Einstein-Cartan theory