Thermodynamic of the Ghost Dark Energy Universe

TL;DR

This paper explores the thermodynamics of a universe dominated by ghost dark energy, proposing a generalized model where the entropy-area relation is modified due to the choice of trapping horizon temperature.

Contribution

It introduces a generalized ghost dark energy model using trapping horizon temperature and analyzes the resulting modifications to the universe's thermodynamics.

Findings

Entropy-area relation is modified with an additional term.

Hawking temperature on trapping horizon coincides with Hubble temperature in flat FRW universe.

The model provides a new perspective on dark energy thermodynamics.

Abstract

Recently, the vacuum energy of the QCD ghost in a time-dependent background is proposed as a kind of dark energy candidate to explain the acceleration of the Universe. In this model, the energy density of the dark energy is proportional to the Hubble parameter $H$, which is the Hawking temperature on the Hubble horizon of the Friedmann-Robertson-Walker (FRW) Universe. In this paper, we generalized this model and choice the Hawking temperature on the so-called trapping horizon, which will coincides with the Hubble temperature in the context of flat FRW Universe dominated by the dark energy component. We study the thermodynamics of Universe with this kind of dark energy and find that the entropy-area relation is modified, namely, there is an another new term besides the area term.