De Sitter spacetimes with torsion in the model of dS gauge theory of gravity

TL;DR

This paper explores de Sitter spacetimes with torsion within a gauge theory of gravity, identifying unique solutions and analyzing their properties, which extend the understanding of vacuum solutions in this theoretical framework.

Contribution

It characterizes vacuum solutions with torsion in de Sitter gauge gravity, including the unique static, spherically symmetric solution with vector torsion.

Findings

Static de Sitter spacetime with torsion is the only spherically symmetric vacuum solution.

Different de Sitter spacetimes with torsion have distinct torsion expressions.

Properties of these spacetimes are systematically studied.

Abstract

In the model of de Sitter gauge theory of gravity, the empty homogenous and isotropic spacetimes with constant curvature scalar and nonvanishing homogenous and isotropic torsion must have de Sitter metrics. The static de Sitter spacetime with static, O(3)-symmetric, vector torsion is the only spherically symmetric, vacuum solution with the metric of the form $g_{\mu\nu}={\rm diag}(A^2(r),-B^2(r),-r^2,-r^2\sin^2\th)$. The expressions of the torsion for different de Sitter spacetimes are presented. They are different from one to another. The properties of different de Sitter spacetimes with torsion are also studied.