Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Scalar-Torsion Mode in a Cosmological Model of the Poincar\'{e} Gauge
  Theory of Gravity   We investigate the equation of state (EoS) of the scalar-torsion mode in
Poincar\'{e} gauge theory of gravity. We concentrate on two cases with the
constant curvature solution and positive kinetic energy, respectively. In the
former, we find that the torsion EoS has different values in the various stages
of the universe. In particular, it behaves like the radiation (matter) EoS of
$w_r=1/3$ ($w_m=0$) in the radiation (matter) dominant epoch, while in the late
time the torsion density is supportive for the accelerating universe. In the
latter, our numerical analysis shows that in general the EoS has an asymptotic
behavior in the high redshift regime, while it could cross the phantom divide
line in the low redshift regime.

16
The categories of this paper are: stat
0
The categories of this paper are: hep-ph
8
The categories of this paper are: hep-ex
12
The categories of this paper are: nucl-th
37
The categories of this paper are: supr-con
13
The categories of this paper are: quant-ph
32
The categories of this paper are: atom-ph
4
The categories of this paper are: cond-mat
33
The categories of this paper are: plasm-ph
21
The categories of this paper are: adap-org
28
The categories of this paper are: alg-geom
26
The categories of this paper are: bayes-an
10
The categories of this paper are: q-bio
29
The categories of this paper are: funct-an
20
The categories of this paper are: acc-phys
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The categories of this paper are: solv-int