Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Some non linear interactions in polytropic gas cosmology: Phase space
  analysis   There are various cosmological models with polytropic equation of state
associated to dark energy. Polytropic EoS has important applications in
astrophysics, therefore a study of it on cosmological framework continues to be
interesting. From the other hand, there are various forms of interactions
phenomenologically involved into the darkness of the universe able to solve
important cosmological problems. This is a motivation for us to perform a phase
space analysis of various cosmological scenarios where non linear interacting
polytropic gas models are involved. Dark matter is taken to be a pressureless
fluid.

32
The categories of this paper are: atom-ph
34
The categories of this paper are: chem-ph
30
The categories of this paper are: q-alg
9
The categories of this paper are: nlin
13
The categories of this paper are: quant-ph
18
The categories of this paper are: econ
7
The categories of this paper are: hep-th
12
The categories of this paper are: nucl-th
8
The categories of this paper are: hep-ex
36
The categories of this paper are: cmp-lg
26
The categories of this paper are: bayes-an
2
The categories of this paper are: math
17
The categories of this paper are: q-fin
14
The categories of this paper are: math-ph
11
The categories of this paper are: hep-lat
37
The categories of this paper are: supr-con