Abstract
We study the fate of density perturbations in a Universe dominate by the Chaplygin gas, which exhibit negative pressure. In opposition to other models of perfect fluid with negative pressure, there is no instability in the small wavelength limit, due to the fact that the sound velocity for the Chaplygin gas is positive. We show that it is possible to obtain the value for the density contrast observed in large scale structure of the Universe by fixing a free parameter in the equation of state of this gas. The negative character of pressure must be significant only very recently.
REFERENCES
Battaner, E. and Florido, E. The rotation curve of spiral galaxies and its cosmological implications, astro-ph/0010475.
Frampton, P. H. Quintessence and cosmic microwave background, astro-ph/0102344.
Riess, A. G. et al. Observational evidence from supernovae for an accelerating Universe and a cosmological constant, astro-ph/9805201.
Permutter, S. et al. (1998). Astrophys. J. 517, 565.
Vilenkin, A. and Shellard, E. P. S. (1994). Cosmic strings and other topological defects, Cambridge University Press, Cambridge.
Caldwell, R. R., Dave, R., Steinhardt, P. (1998). Phys. Rev. Lett. 80, 1582.
Carroll, S. M. The cosmological constant, astro-ph/0004075.
Bouchet, F. R., Peter, P., Riazuelo, A. and Sakellariadou, M. Evidence against or for topological defects in the Boomerang data., astro-ph/0005022.
Brax, Ph. and Martin, J. (1999). Phys. Lett. B468, 40.
Kamenshchik, A., Moschella, U. and Pasquier, V. An alternative to quintessence, gr-qc/0103004.
Bordemann, M. and Hoppe, J. (1993). Phys. Lett. B317, 315.
Ogawa, N. (2000). Phys. Rev. D62, 085023.
Jackiw, R. A particle field theorist's lectures on supersymmetric, non-abelian fluid mechanics and d-branes, physics/0010042.
Mukhanov, V. F., Feldman, H. A., and Brandenberger, R. H. (1992). Phys. Rep. 215, 203.
Peebles, P. J. E. (1980). The large-scale structure of the Universe, Princeton University Press, New Jersey.
Weinberg, S. (1972). Gravitation and cosmology, Wiley, New York.
Fabris, J. C. and Martin, J. (1997). Phys. Rev. D55, 5205.
Fabris, J. C., Gonçalves, S. V. B. and Tomimura, N. A. (2000). Class. Quant. Grav. 17, 2983.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Fabris, J., Gonçalves, S. & de Souza, P. Letter: Density Perturbations in a Universe Dominated by the Chaplygin Gas. General Relativity and Gravitation 34, 53–63 (2002). https://doi.org/10.1023/A:1015266421750
Issue Date:
DOI: https://doi.org/10.1023/A:1015266421750