Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Dynamics of classes of barotropic fluids in spatially curved FRW
  spacetimes   In this article we perform dynamical analysis of a broad class of barotropic
fluids in the spatially curved Friedmann-Robertson-Walker (FRW) spacetime
background without considering the cosmological constant. The first part of our
study concerns the dynamics of a fluid with an unspecified barotropic equation
of state (EoS) having as the only assumption the non-negativity of the fluid's
energy density. After defining a new set of dimensionless variables and a new
evolution parameter, we introduce the function $\Gamma$ that encodes the EoS.
In this general setup several features of the system are identified: critical
points, invariant subsets and the characteristics of the function $\Gamma$,
along with their cosmological interpretations. The second part of our work
provides two examples with specific $\Gamma$ functions. In the first example we
provide a $\Gamma$ function and then we exhibit how it can be trimmed down to a
specific class of EoS through physical arguments, while in the second example
we discuss the quadratic EoS studied in Phys.Rev. D {\bf 74}, 023523 (2006) by
comparing our approach with their analysis.

27
The categories of this paper are: comp-gas
1
The categories of this paper are: cs
2
The categories of this paper are: math
12
The categories of this paper are: nucl-th
0
The categories of this paper are: hep-ph
28
The categories of this paper are: alg-geom
8
The categories of this paper are: hep-ex
22
The categories of this paper are: chao-dyn
33
The categories of this paper are: plasm-ph
14
The categories of this paper are: math-ph
18
The categories of this paper are: econ
26
The categories of this paper are: bayes-an
3
The categories of this paper are: physics
7
The categories of this paper are: hep-th
20
The categories of this paper are: acc-phys
34
The categories of this paper are: chem-ph