Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-11-17
Phys.Rev.D73:043508,2006
Astronomy and Astrophysics
Astrophysics
15 pages, 4 figures, accepted for publication on Physical Review D
Scientific paper
10.1103/PhysRevD.73.043508
Abandoning the perfect fluid hypothesis, we investigate here the possibility that the dark energy equation of state (EoS) $w$ is a nonlinear function of the energy density $\rho$. To this aim, we consider four different EoS describing classical fluids near thermodynamical critical points and discuss the main features of cosmological models made out of dust matter and a dark energy term with the given EoS. Each model is tested against the data on the dimensionless coordinate distance to Type Ia Supernovae and radio galaxies, the shift and the acoustic peak parameters and the positions of the first three peaks in the anisotropy spectrum of the comic microwave background radation. We propose a possible interpretation of each model in the framework of scalar field quintessence determining the shape of the self interaction potential $V(\phi)$ that gives rise to each one of the considered thermodynamical EoS. As a general result, we demonstrate that replacing the perfect fluid EoS with more generar expressions gives both the possibility of successfully solving the problem of cosmic acceleration escaping the resort to phantom models.
Capozziello Salvatore
Cardone Vincenzo Fabrizio
Tortora Crescenzo
Troisi Alessandro
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