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APS » Journals » Phys. Rev. D » Volume 67 » Issue 6
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Phys. Rev. D 67, 063509 (2003) [5 pages]

Can the Chaplygin gas be a plausible model for dark energy?

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Vittorio Gorini
Dipartimento di Scienze Matematiche, Fisiche e Chimiche, Università dell’Insubria, Via Valleggio 11, 22100 Como, Italy
INFN Sezione di Milano, Milano, Italy

Alexander Kamenshchik
Dipartimento di Scienze Matematiche, Fisiche e Chimiche, Università dell’Insubria, Via Valleggio 11, 22100 Como, Italy
L. D. Landau Institute for Theoretical Physics of Russian Academy of Sciences, Kosygin Street 2, 117334, Moscow, Russia

Ugo Moschella
Dipartimento di Scienze Matematiche, Fisiche e Chimiche, Università dell’Insubria, Via Valleggio 11, 22100 Como, Italy
INFN Sezione di Milano, Milano, Italy

Received 4 October 2002; published 26 March 2003

In this paper two cosmological models representing the flat Friedmann universe filled with a Chaplygin fluid, with or without dust, are analyzed in terms of the recently proposed “statefinder” parameters. Trajectories of both models in the parameter plane are shown to be significantly different with respect to the “quiessence” and “tracker” models. The generalized Chaplygin gas model with an equation of state of the form p=-A/ρα is also analyzed in terms of the statefinder parameters.

© 2003 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevD.67.063509
DOI:
10.1103/PhysRevD.67.063509
PACS:
98.80.Es, 98.80.Cq, 98.80.Jk
 
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