English

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

Astrophysics 2009-11-07 v1 General Relativity and Quantum Cosmology

Abstract

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/ραp = -A/\rho^{\alpha} is also analyzed in terms of the statefinder parameters.

Keywords

Cite

@article{arxiv.astro-ph/0209395,
  title  = {Can the Chaplygin gas be a plausible model for dark energy?},
  author = {Vittorio Gorini and Alexander Kamenshchik and Ugo Moschella},
  journal= {arXiv preprint arXiv:astro-ph/0209395},
  year   = {2009}
}

Comments

6 pages, 2 figures