de Sitter Gauge Theory of Gravity: An Alternative Torsion Cosmology

TL;DR

This paper introduces a de Sitter gauge theory-based cosmological model that predicts an exponential universe expansion, aligns with observational data, and offers an alternative to the standard Lambda-CDM model.

Contribution

It develops a novel cosmological model based on de Sitter gauge theory, analyzes its dynamics, and fits it to supernova data, providing an alternative torsion cosmology.

Findings

The universe tends toward exponential expansion as a positive attractor.

The model's predictions are consistent with Union 2 SNIa observational data.

The dynamical system has nine critical points, including attractors.

Abstract

A new cosmological model based on the de Sitter gauge theory (dSGT) is studied in this paper. By some transformations, we find, in the dust universe, the cosmological equations of dSGT could form an autonomous system. We conduct dynamics analysis to this system, and find 9 critical points, among which there exist one positive attractor and one negative attractor. The positive attractor shows us that our universe will enter a exponential expansion phase in the end, which is similar to the conclusion of $\Lambda$CDM. We also carry out some numerical calculations, which confirms the conclusion of dynamics analysis. Finally, we fit the model parameter and initial values to the Union 2 SNIa dataset, present the confidence contour of parameters and obtain the best-fit values of parameters of dSGT.