On phantom thermodynamics with negative temperature

Abstract

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 $\rho$

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

References in corpus (1)

• Generalized Second Law and phantom Cosmology: accreting black holes

Cited by in corpus (2)

• Unified dark energy thermodynamics: varying w and the -1-crossing
• Horizon Complementarity and Casimir Violations of the Null Energy Condition