TL;DR
This paper explores how spinning fluids influence the evolution of flat cosmological models, revealing solutions where fluid velocity and momentum are not aligned, and expressing spin effects via the scale factor.
Contribution
It introduces a model of spinning fluid in cosmology with non-co-linear velocity and momentum, extending traditional perfect-fluid models with spin considerations.
Findings
Solutions with non-co-linear velocity and momentum
Expressions for spin and momentum densities in terms of the scale factor
Spinning fluid affects the dynamics of flat cosmological models
Abstract
The dynamics of a spinning fluid in a flat cosmological model is investigated. The space-time is itself generated by the spinning fluid which is characterized by an energy-momentum tensor consisting a sum of the usual perfect-fluid energy-momentum tensor and some Belinfante-Rosenfeld tensors. It is shown that the equations of motion admit a solution for which the fluid four-velocity and four-momentum are not co-linear in general. The momentum and spin densities of the fluid are expressed in terms of the scale factor.
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