An analysis of the expansion acceleration of the Universe in the Interacting Holographic Dark Energy model

TL;DR

This paper investigates how the interacting holographic dark energy model, especially with the apparent horizon, can explain the Universe's accelerated expansion and phase transition from deceleration to acceleration.

Contribution

It demonstrates that incorporating interaction and using the apparent horizon enables the holographic model to account for cosmic acceleration.

Findings

Interaction induces phase change and transition to acceleration.

Apparent horizon allows acceleration in holographic models.

Model explains transition from decelerated to accelerated expansion.

Abstract

Holographic model is originated from Holographic principle. The equation of state in Holographic model and Einstein's gravity with particle horizon can be obtained as wD>-1/3 and cannot justify the expansion acceleration of the Universe. But, by using the event horizon, this model can result in the accelerating expansion in Einstein's gravity and Brans-Dicke cosmology. In this context, we study the holographic model with apparent horizon satisfying the acceleration expansion. We shall see, in the presence of interaction, phase change and transition from decelerated state to accelerated state is possible. This shows the sign of deceleration parameter.