Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Polytropic Approach to Semi-relativistic Isothermal Gas Spheres at
  Arbitrary Temperature   We use standard polynomial expansion technique to show the existence of a
relation between polytropic model and the description of gas spheres at finite
temperature. A numerical analysis is made concerning the obtained perturbative
parameters. It is shown that there is a correspondence between polytropic and
gas sphere thermal models for fermions and bosons. For instance, the polytropic
index $n$ displays evident correlation with temperature and chemical potential.

37
The categories of this paper are: supr-con
33
The categories of this paper are: plasm-ph
2
The categories of this paper are: math
21
The categories of this paper are: adap-org
35
The categories of this paper are: mtrl-th
36
The categories of this paper are: cmp-lg
32
The categories of this paper are: atom-ph
12
The categories of this paper are: nucl-th
3
The categories of this paper are: physics
29
The categories of this paper are: funct-an
9
The categories of this paper are: nlin
28
The categories of this paper are: alg-geom
34
The categories of this paper are: chem-ph
1
The categories of this paper are: cs
26
The categories of this paper are: bayes-an
22
The categories of this paper are: chao-dyn