Non-zero torsion and late cosmology

Miguel Cruz, Fernando Izaurieta, Samuel Lepe
2020 European Physical Journal C: Particles and Fields  
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 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
more » ... sitive. 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.
doi:10.1140/epjc/s10052-020-8128-y fatcat:5qetkwex3jf7rapbeolug6z2pa