Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Galaxy Cluster Gas Mass Fraction and Hubble Parameter versus Redshift
  Constraints on Dark Energy   Galaxy cluster gas mass fraction versus redshift data and Hubble parameter
versus redshift data are used to jointly constrain dark energy models. These
constraints favor the Einstein cosmological constant limit of dark energy but
do not strongly rule out slowly-evolving dark energy.

35
The categories of this paper are: mtrl-th
4
The categories of this paper are: cond-mat
31
The categories of this paper are: ao-sci
12
The categories of this paper are: nucl-th
3
The categories of this paper are: physics
11
The categories of this paper are: hep-lat
7
The categories of this paper are: hep-th
19
The categories of this paper are: eess
16
The categories of this paper are: stat
10
The categories of this paper are: q-bio
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The categories of this paper are: atom-ph
21
The categories of this paper are: adap-org
30
The categories of this paper are: q-alg
1
The categories of this paper are: cs
5
The categories of this paper are: gr-qc
9
The categories of this paper are: nlin