Semi-Holographic Universe

TL;DR

This paper proposes a semi-holographic model of the universe where dark energy obeys the holographic principle, leading to a natural emergence of dark matter and a stable late-time scaling solution consistent with observations.

Contribution

It introduces a semi-holographic framework linking dark energy and dark matter through thermodynamics, providing a potential solution to the coincidence problem.

Findings

Existence of a stable dark energy-dark matter scaling solution.

Deceleration parameter aligns with current observational data.

Dark energy obeying holography implies dark matter is necessary.

Abstract

By assuming that a dark component (dark energy) in the universe strictly obeys the holographic principle, that is, its entropy is one fourth of the apparent horizon, we find that the existence of the other dark component (dark matter) is compulsory, as a compensation of dark energy, based on the first law of thermodynamics. By using the method of dynamical system analysis, we find that there exists a stable dark energy-dark matter scaling solution at late time, which is helpful to solve the coincidence problem. For reasonable parameters, the deceleration parameter is well consistent with current observations.