Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Observational Constraints on Variable Chaplygin Gas   We investigate observational constraints on the variable Chaplygin gas model
from the gold sample of type Ia supernova data and the recent measurements of
the X-ray gas mass fractions in galaxy clusters. Combining these databases, we
obtain a tight constraint on the two model parameters. Our results indicate
that the original Chaplygin gas model is ruled out by the data at 99.7%
confidence level.

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The categories of this paper are: alg-geom
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The categories of this paper are: q-alg
4
The categories of this paper are: cond-mat
11
The categories of this paper are: hep-lat
1
The categories of this paper are: cs
17
The categories of this paper are: q-fin
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The categories of this paper are: nlin
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The categories of this paper are: patt-sol
18
The categories of this paper are: econ
0
The categories of this paper are: hep-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: atom-ph
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The categories of this paper are: q-bio
12
The categories of this paper are: nucl-th
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The categories of this paper are: cmp-lg
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The categories of this paper are: quant-ph