Thermodynamic aspects of dark energy fluids

In this paper we investigate the limits imposed by thermodynamics on a dark energy fluid. We obtain the heat capacities and the compressibilities for a dark energy fluid. The thermal and mechanical stabilities require these quantities to be positive. We show that dark energy fluids must satisfy the...

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Bibliographic Details
Published in:Physical review. D 2015-10, Vol.92 (8), Article 083526
Main Authors: Barboza, Edésio M., Nunes, Rafael C., Abreu, Everton M. C., Neto, Jorge Ananias
Format: Article
Language:English
Subjects:
Computational fluid dynamics
Cosmology
Dark energy
Fluid flow
Fluids
Mathematical models
Stability
Thermodynamics
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Summary:In this paper we investigate the limits imposed by thermodynamics on a dark energy fluid. We obtain the heat capacities and the compressibilities for a dark energy fluid. The thermal and mechanical stabilities require these quantities to be positive. We show that dark energy fluids must satisfy the stability conditions and that such a requirement puts difficulties on the cosmic fluid models with negative constant equation-of-state (EoS) parameters. We also show that the observational constraints imposed by type Ia supernova, BAO and H (z) data on a general dark energy fluid with a time-dependent EoS parameter are in conflict with the constraints imposed by thermodynamics. This result indicates that dark energy fluid models are unphysical.
ISSN:1550-7998
2470-0010
1550-2368
2470-0029
DOI:10.1103/PhysRevD.92.083526