Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Reduced modified Chaplygin gas cosmology   In this paper, we study cosmologies containing the reduced modified Chaplygin
gas (RMCG) fluid which is reduced from the modified Chaplygin gas
$p=A\rho-B\rho^{-\alpha}$ for the value of $\alpha=-1/2$. In this special case,
dark cosmological models can be realized for different values of model
parameter $A$. We investigate the viabilities of these dark cosmological models
by discussing the evolutions of cosmological quantities and using the currently
available cosmic observations. It is shown that the special RMCG model ($A=0$
or $A=1$) which unifies the dark matter and dark energy should be abandoned.
For $A=1/3$, RMCG which unifies the dark energy and dark radiation is the
favorite model according to the objective Akaike information criteria. In the
case of $A<0$, RMCG can achieve the features of the dynamical quintessence and
phantom models, where the evolution of the universe is not sensitive to the
variation of model parameters.

18
The categories of this paper are: econ
7
The categories of this paper are: hep-th
0
The categories of this paper are: hep-ph
21
The categories of this paper are: adap-org
19
The categories of this paper are: eess
20
The categories of this paper are: acc-phys
32
The categories of this paper are: atom-ph
37
The categories of this paper are: supr-con
27
The categories of this paper are: comp-gas
35
The categories of this paper are: mtrl-th
2
The categories of this paper are: math
10
The categories of this paper are: q-bio
4
The categories of this paper are: cond-mat
30
The categories of this paper are: q-alg
36
The categories of this paper are: cmp-lg
25
The categories of this paper are: patt-sol