Generalized Chaplygin gas model: constraints from Hubble parameter versus Redshift Data
Abstract
We examine observational constraints on the generalized Chaplygin gas (GCG) model for dark energy from the 9 Hubble parameter data points, the 115 SNLS Sne Ia data and the size of baryonic acoustic oscillation peak at redshift,
z=0.35
. At a 95.4% confidence level, a combination of three data sets gives
0.67≤
A
s
≤0.83
and
−0.21≤α≤0.42
, which is within the allowed parameters ranges of the GCG as a candidate of the unified dark matter and dark energy. It is found that the standard Chaplygin gas model (
α=1
) is ruled out by these data at the 99.7% confidence level.