Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Radiating fluid spheres in the effective variables approximation   We study the evolution of spherically symmetric radiating fluid distributions
using the effective variables method, implemented {\it ab initio} in
Schwarzschild coordinates. To illustrate the procedure and to establish some
comparison with the original method, we integrate numerically the set of
equations at the surface for two different models. The first model is derived
from the Schwarzschild interior solution. The second model is inspired in the
Tolman VI solution.

7
The categories of this paper are: hep-th
35
The categories of this paper are: mtrl-th
9
The categories of this paper are: nlin
34
The categories of this paper are: chem-ph
29
The categories of this paper are: funct-an
10
The categories of this paper are: q-bio
37
The categories of this paper are: supr-con
17
The categories of this paper are: q-fin
1
The categories of this paper are: cs
28
The categories of this paper are: alg-geom
6
The categories of this paper are: astro-ph
23
The categories of this paper are: solv-int
2
The categories of this paper are: math
8
The categories of this paper are: hep-ex
4
The categories of this paper are: cond-mat
14
The categories of this paper are: math-ph