Regular Article - Theoretical Physics
The cosmology of quadratic torsionful gravity
Institute of Theoretical Physics, Department of Physics, Aristotle University of Thessaloniki, 54124, Thessaloniki, Greece
2 DISAT, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129, Turin, Italy
3 INFN, Sezione di Torino, Via P. Giuria 1, 10125, Turin, Italy
Accepted: 5 August 2021
Published online: 15 August 2021
We study the cosmology of a quadratic metric-compatible torsionful gravity theory in the presence of a perfect hyperfluid. The gravitational action is an extension of the Einstein–Cartan theory given by the usual Einstein–Hilbert contribution plus all the admitted quadratic parity even torsion scalars and the matter action also exhibits a dependence on the connection. The equations of motion are obtained by regarding the metric and the metric-compatible torsionful connection as independent variables. We then consider a Friedmann–Lemaître–Robertson–Walker background, analyze the conservation laws, and derive the torsion modified Friedmann equations for our theory. Remarkably, we are able to provide exact analytic solutions for the torsionful cosmology.
© The Author(s) 2021
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