Holographic Dark Energy and the Universe Expansion Acceleration

TL;DR

This paper explores a holographic dark energy model based on a time-dependent cosmological constant, providing a geometric explanation for the universe's accelerated expansion and addressing the coincidence problem.

Contribution

It introduces a holographic principle-based dark energy model with no need for an equation of state, explaining acceleration and coincidence without extra structures.

Findings

Constraints on model parameters derived from physical bounds

Model explains universe acceleration without additional entities

Addresses the coincidence problem effectively

Abstract

By incorporating the holographic principle in a time-depending Lambda-term cosmology, new physical bounds on the arbitrary parameters of the model can be obtained. Considering then the dark energy as a purely geometric entity, for which no equation of state has to be introduced, it is shown that the resulting range of allowed values for the parameters may explain both the coincidence problem and the universe accelerated expansion, without resorting to any kind of additional structures.