On phantom thermodynamics with negative temperature

Details On phantom thermodynamics with negative temperature On phantom thermodynamics with negative temperature

2008-10-24

arxiv.org/abs/0810.4385v2

Phys.Lett.B671:216-218,2009

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

8 pages, 1figure, title changed, version to appear in PLB

Scientific paper

10.1016/j.physletb.2008.12.011

We discuss the thermodynamic properties of the Friedmann-Robertson-Walker universe with dark energy fluids labelled by $\omega=p/\rho<-1/3$. Using the integrability condition, we show that the phantom phase of $w<-1$ can still be thermodynamically allowed even when the temperature takes on negative values because in that case, there exists at least a condition of keeping physical values for $p$ and $\rho$

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