Sourced Friedmann equations with holographic energy density

TL;DR

This paper explores how sourced Friedmann equations with holographic energy density can naturally incorporate matter interactions and generate cosmic acceleration, providing a new perspective on dark energy models.

Contribution

It introduces a framework with sourced Friedmann equations that allows for matter interactions and proposes a microscopic decay mechanism for holographic energy density leading to acceleration.

Findings

Holographic energy density decays into dust matter with negative constant equation of state.

The framework can produce accelerating cosmological solutions.

IR cutoffs like Hubble horizon and future event horizon are effective in this model.

Abstract

We reexamine cosmological applications of the holographic energy density in the framework of sourced Friedmann equations. This framework is suitable because it can accommodate a macroscopic interaction between holographic and ordinary matter naturally. In the case that the holographic energy density decays into dust matter, we propose a microscopic mechanism to generate an accelerating phase. Actually, the cosmic anti-friction arisen from the decay process induces acceleration. For examples, we introduce two IR cutoffs of Hubble horizon and future event horizon to test this framework. As a result, it is shown that the equations of state for the holographic energy density are determined to be the same negative constants as those for the dust matter.