Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Testing the (generalized) Chaplygin gas model with the Lookback
  time-Redshift data   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, $0.68\leq A_c\leq0.82$ and $0.59\leq h\leq0.65$ for the CG
model, and $0.67\leq A_s\leq0.89$ and $-0.29\leq \alpha\leq0.61$ 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
($\alpha=1$) is ruled out by these data at the 99.7% confidence level.

37
The categories of this paper are: supr-con
21
The categories of this paper are: adap-org
16
The categories of this paper are: stat
7
The categories of this paper are: hep-th
12
The categories of this paper are: nucl-th
9
The categories of this paper are: nlin
17
The categories of this paper are: q-fin
2
The categories of this paper are: math
15
The categories of this paper are: nucl-ex
33
The categories of this paper are: plasm-ph
25
The categories of this paper are: patt-sol
28
The categories of this paper are: alg-geom
1
The categories of this paper are: cs
30
The categories of this paper are: q-alg
26
The categories of this paper are: bayes-an
27
The categories of this paper are: comp-gas