Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Dinamic model of spherical perturbations in Friedmann Universe   A selfconsistent system of equations describing evolution of linear
spherically symmetric perturbations in Fridmann world by an arbitrary equation
of state is obtained. The perturbations singular part corresponding to massive
particle-like source is extracted, an evolutionary equation for mass of this
source is obtained and exactly solved. An exact solution of evolutionary
equations of state for perturbations by an arbitrary equation of state is
constructed.

21
The categories of this paper are: adap-org
32
The categories of this paper are: atom-ph
7
The categories of this paper are: hep-th
35
The categories of this paper are: mtrl-th
23
The categories of this paper are: solv-int
24
The categories of this paper are: dg-ga
1
The categories of this paper are: cs
31
The categories of this paper are: ao-sci
29
The categories of this paper are: funct-an
16
The categories of this paper are: stat
6
The categories of this paper are: astro-ph
26
The categories of this paper are: bayes-an
18
The categories of this paper are: econ
25
The categories of this paper are: patt-sol
8
The categories of this paper are: hep-ex
28
The categories of this paper are: alg-geom