Testing the (generalized) Chaplygin gas model with the Lookback time-Redshift data
Cosmology and Nongalactic Astrophysics
2009-09-11 v2 General Relativity and Quantum Cosmology
Abstract
The Chaplygin gas (CG) and the generalized Chaplygin gas (GCG) models, proposed as candidates of the unified dark matter-dark energy (UDME), are tested with the look-back time (LT) redshift data. We find that the LT data only give a very weak constraint on the model parameter. However, by combing the LT with the baryonic acoustic oscillation peak, we obtain, at the 95.4% confidence level, and for the CG model, and and for the GCG model. This shows that both the CG and the GCG are viable as a candidate of UDME. Within the GCG model, we also find that the Chaplygin gas model () is ruled out by these data at the 99.7% confidence level.
Cite
@article{arxiv.0908.3415,
title = {Testing the (generalized) Chaplygin gas model with the Lookback time-Redshift data},
author = {Zhengxiang Li and Puxun Wu and Hongwei Yu},
journal= {arXiv preprint arXiv:0908.3415},
year = {2009}
}
Comments
13 pages, 5 figures, a couple of references added, published version