Low-Redshift Constraints on Covariant Canonical Gauge Theory of Gravity

TL;DR

This paper investigates the low-redshift cosmological constraints on Covariant Canonical Gauge Gravity, an extension of General Relativity with additional geometric terms, finding it compatible with current observational data.

Contribution

It introduces and tests a quadratic Riemann-Cartan extension of GR, analyzing its cosmological implications and compatibility with observational data.

Findings

The model fits low-redshift data comparably to ΛCDM.

Modifications are subdominant in low-redshift cosmology.

Non-zero curvature and deformation parameters are consistent with observations.

Abstract

Constraints on the Covariant Canonical Gauge Gravity (CCGG) theory from low-redshift cosmology are studied. The formulation extends Einstein's theory of General Relativity (GR) by a quadratic Riemann-Cartan term in the Lagrangian, controlled by a "deformation" parameter. In the Friedman universe this leads to an additional geometrical stress energy and promotes, due to the necessary presence of torsion, the cosmological constant to a time-dependent function. The MCMC analysis of the combined data sets of Type Ia Supernovae, Cosmic Chronometers and Baryon Acoustic Oscillations yields a fit that is well comparable with the $\Lambda$CDM results. The modifications implied in the CCGG approach turn out to be subdominant in the low-redshift cosmology. However, a non-zero spatial curvature and deformation parameter are shown to be consistent with observations.