Non-zero torsion and late cosmology

Miguel Cruz (Facultad de Física, Universidad Veracruzana, Xalapa, Veracruz, 91000, México) ; Fernando Izaurieta (Departamento de Física, Universidad de Concepción, Casilla 160, Concepción, 4070105, Chile) ; Samuel Lepe (Instituto de Física, Facultad de Ciencias, Pontificia Universidad Católica de Valparaíso, Av. Brasil 2950, Valparaíso, Chile)

In this work, we study some thermodynamical aspects associated with torsion in a flat FLRW spacetime cosmic evolution. By implementing two Ansatze for the torsion term, we find that the model admits a phantom regime or a quintessence behavior. This scheme differs from the $$\Lambda $$ Λ CDM model at the thermodynamical level. The resulting cosmic expansion is not adiabatic, the fulfillment of the second law of thermodynamics requires a positive torsion term, and the temperature of the cosmic fluid is always positive. The entropy of the torsion phantom scenario is negative, but introducing chemical potential solves this issue. For a Dirac-Milne type Universe, the torsion leads to a growing behavior for the temperature of the fluid but has no incidence on the rate of expansion.

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      "value": "In this work, we study some thermodynamical aspects associated with torsion in a flat FLRW spacetime cosmic evolution. By implementing two Ansatze for the torsion term, we find that the model admits a phantom regime or a quintessence behavior. This scheme differs from the $$\\Lambda $$ <math><mi>\u039b</mi></math> CDM model at the thermodynamical level. The resulting cosmic expansion is not adiabatic, the fulfillment of the second law of thermodynamics requires a positive torsion term, and the temperature of the cosmic fluid is always positive. The entropy of the torsion phantom scenario is negative, but introducing chemical potential solves this issue. For a Dirac-Milne type Universe, the torsion leads to a growing behavior for the temperature of the fluid but has no incidence on the rate of expansion."
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Published on:
19 June 2020
Publisher:
Springer
Published in:
European Physical Journal C , Volume 80 (2020)
Issue 6
Pages 1-9
DOI:
https://doi.org/10.1140/epjc/s10052-020-8128-y
Copyrights:
The Author(s)
Licence:
CC-BY-4.0

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