Issue |
A&A
Volume 417, Number 3, April III 2004
|
|
---|---|---|
Page(s) | 847 - 852 | |
Section | Cosmology (including clusters of galaxies) | |
DOI | https://doi.org/10.1051/0004-6361:20035627 | |
Published online | 26 March 2004 |
Constraints on Chaplygin quartessence from the CLASS gravitational lens statistics and supernova data
1
Department of Physics and Astrophysics, University of Delhi, Delhi 110007, India e-mail: abha@ducos.ernet.in
2
Deen Dayal Upadhyaya College, University of Delhi, Delhi 110015, India e-mail: deepak@physics.du.ac.in
3
Departamento de Física, Universidade Federal do Rio Grande do Norte, CP 1641, Natal - RN, 59072-970, Brasil
Corresponding author: J. S. Alcaniz, alcaniz@dfte.ufrn.br
Received:
4
November
2003
Accepted:
31
December
2003
The nature of the dark components (dark matter and dark energy)
that dominate the current cosmic evolution is a completely open
question at present. In reality, we do not even know if they
really constitute two separated substances. In this paper we use
the recent Cosmic All Sky Survey (CLASS) lensing sample to test
the predictions of one of the candidates for a unified dark
matter/energy scenario, the so-called generalized Chaplygin gas
(Cg) which is parametrized by an equation of state where A and α are arbitrary
constants. We show that, although the model is in good agreement
with this radio source gravitational lensing sample, the limits
obtained from CLASS statistics are only marginally compatible with
the ones obtained from other cosmological tests. We also
investigate the constraints on the free parameters of the model
from a joint analysis between CLASS and supernova data.
Key words: cosmology: theory / cosmology: dark matter / cosmology: cosmological parameters / cosmology: distance scale
© ESO, 2004
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