Holographic Dark Energy with Torsion

TL;DR

This paper explores a holographic dark energy model incorporating axial torsion within Einstein-Cartan gravity, analyzing different infrared cut-offs and their effects on cosmic acceleration, with potential superluminal implications.

Contribution

It introduces a novel holographic dark energy model with axial torsion and examines its implications for cosmic acceleration using various IR cut-offs.

Findings

Holographic dark energy with particle horizon does not cause acceleration.

Future event horizon as IR cut-off achieves acceleration.

Hubble radius as IR cut-off may lead to superluminal expansion.

Abstract

We consider the holographic dark energy model with axial torsion which satisfy the cosmological principle. Subsequently, by using the torsional analogues of Friedmann equations for the new equation from Einstein-Cartan gravity theory, we obtain the equation of state for dark energy in this model. We find that the extended holographic dark energy from the particle horizon as the infrared (IR) cut-off does not give the accelerating expansion of the universe. Also, employing the future event horizon as IR cut-off still achieves the accelerating expansion of the universe. In contrast, there is a possibility that the Hubble radius as IR cut-off achieves to the accelerating expansion of the universe in superluminal region for axial torsion. More precisely, the current value of ratio for torsion to the matter density, $\gamma^{0}=0.5$ gives the equation of state of dark energy $\omega_{\Lambda}\cong-1$.