Dark energy and inflation invoked in CCGG by locally contorted space-time
David Vasak, Johannes Kirsch, Juergen Struckmeier

TL;DR
This paper explores how Covariant Canonical Gauge Theory of Gravity (CCGG) introduces torsion and a scalar field that mimic dark energy, leading to diverse cosmological scenarios and potential solutions to the cosmological constant problem and Hubble tension.
Contribution
It demonstrates that CCGG naturally incorporates torsion and a scalar field affecting cosmology, with a single parameter controlling deviations from Einstein gravity and explaining various universe evolutions.
Findings
Identification of three cosmological solutions including bounce and inflation scenarios
The deformation parameter influences the universe's evolution and can be constrained by observations
The theory offers insights into the cosmological constant problem and Hubble tension
Abstract
The cosmological implications of the Covariant Canonical Gauge Theory of Gravity (CCGG) are investigated. We deduce that, in a metric compatible geometry, the requirement of covariant conservation of matter invokes torsion of space-time. In the Friedman model this leads to a scalar field built from contortion and the metric with the property of dark energy, which transforms the cosmological constant to a time-dependent function. Moreover, the quadratic, scale invariant Riemann-Cartan term in the CCGG Lagrangian endows space-time with kinetic energy, and in the field equations adds a geometrical curvature correction to Einstein gravity. Applying in the Friedman model the standard CDM parameter set, those equations yield a cosmological field depending just on one additional, dimensionless ``deformation'' parameter of the theory that determines the strength of the quadratic term,…
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