Can the Chaplygin gas be a plausible model for dark energy?
Abstract
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.
- Publication:
-
Physical Review D
- Pub Date:
- March 2003
- DOI:
- 10.1103/PhysRevD.67.063509
- arXiv:
- arXiv:astro-ph/0209395
- Bibcode:
- 2003PhRvD..67f3509G
- Keywords:
-
- 98.80.Es;
- 98.80.Cq;
- 98.80.Jk;
- Observational cosmology;
- Particle-theory and field-theory models of the early Universe;
- Mathematical and relativistic aspects of cosmology;
- Astrophysics;
- General Relativity and Quantum Cosmology
- E-Print:
- 6 pages, 2 figures