Cosmic age problem revisited in the holographic dark energy model

TL;DR

This paper proposes that including interaction and spatial curvature in the holographic dark energy model can resolve the cosmic age problem posed by old high-redshift objects like quasar APM 08279+5255.

Contribution

It introduces an interacting holographic dark energy model in a non-flat universe to address the cosmic age problem, extending previous models that faced similar issues.

Findings

Interaction and curvature help resolve the age problem.

The model accommodates the old quasar at high redshift.

Cosmic age constraints are satisfied with the new model.

Abstract

Because of an old quasar APM 08279+5255 at $z=3.91$, some dark energy models face the challenge of the cosmic age problem. It has been shown by Wei and Zhang [Phys. Rev. D {\bf 76}, 063003 (2007)] that the holographic dark energy model is also troubled with such a cosmic age problem. In order to accommodate this old quasar and solve the age problem, we propose in this Letter to consider the interacting holographic dark energy in a non-flat universe. We show that the cosmic age problem can be eliminated when the interaction and spatial curvature are both involved in the holographic dark energy model.