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

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

2002-09-19

arxiv.org/abs/astro-ph/0209395v1

Phys.Rev. D67 (2003) 063509

Astronomy and Astrophysics

Astrophysics

6 pages, 2 figures

Scientific paper

10.1103/PhysRevD.67.063509

In this note 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 w.r.t. "quiessence" and "tracker" models. The generalized Chaplygin gas model with an equation of state of the form $p = -A/\rho^{\alpha}$ is also analyzed in terms of the statefinder parameters.

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