Interacting model of new agegraphic dark energy: observational constraints and age problem

TL;DR

This paper investigates the age problem in the new agegraphic dark energy (NADE) model and proposes an interacting version (INADE) that can better accommodate old high-redshift objects like quasar APM 08279+5255.

Contribution

It introduces an interacting NADE model and demonstrates its ability to resolve the age problem with observational data constraints.

Findings

NADE faces age problem with old quasar APM 08279+5255.

Interaction between dark energy and dark matter alleviates the age problem.

INADE model successfully accommodates the quasar at 2σ confidence level.

Abstract

Many dark energy models fail to pass the cosmic age test because of the old quasar APM 08279+5255 at redshift $z=3.91$, the $\Lambda$CDM model and holographic dark energy models being no exception. In this paper, we focus on the topic of age problem in the new agegraphic dark energy (NADE) model. We determine the age of the universe in the NADE model by fitting the observational data, including type Ia supernovae (SNIa), baryon acoustic oscillations (BAO) and the cosmic microwave background (CMB). We find that the NADE model also faces the challenge of the age problem caused by the old quasar APM 08279+5255. In order to overcome such a difficulty, we consider the possible interaction between dark energy and dark matter. We show that this quasar can be successfully accommodated in the interacting new agegraphic dark energy (INADE) model at the $2\sigma$ level under the current observational constraints.