On the Chemical Potential of Dark Energy

TL;DR

This paper explores how introducing a negative chemical potential to dark energy affects its thermodynamic properties, especially in the phantom regime, making the model thermodynamically consistent without negative temperatures.

Contribution

It demonstrates that a negative chemical potential can resolve thermodynamic inconsistencies in phantom dark energy models.

Findings

Negative chemical potential makes phantom dark energy thermodynamically consistent.

Avoids the need for negative temperatures in dark energy models.

Provides a new perspective on dark energy thermodynamics.

Abstract

It is widely assumed that the observed universe is accelerating due to the existence of a new fluid component called dark energy. In this article, the thermodynamics consequences of a nonzero chemical potential on the dark energy component is discussed with special emphasis to the phantom fluid case. It is found that if the dark energy fluid is endowed with a negative chemical potential, the phantom field hypothesis becomes thermodynamically consistent with no need of negative temperatures as recently assumed in the literature.