Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Qualitative Analysis and Numerical Simulation of Equations of the
  Standard Cosmological Model   On the basis of qualitative theory of differential equations it is shown that
dynamic system based on the system of Einstein - Klein - Gordon equations with
regard to Friedman Universe has a stable center corresponding to zero values of
scalar potential and its derivative at infinity. Thus, the cosmological model
based on single massive classical scalar field in infinite future would give a
flat Universe. The carried out numerical simulation of the dynamic system
corresponding to the system of Einstein - Klein - Gordon equations showed that
at great times of the evolution the invariant cosmological acceleration has a
microscopic oscillating character ($T\sim 2\pi mt$), while macroscopic value of
the cosmological acceleration varies from $+1$ at inflation stage after which
if decreases fast to $-1/2$ (non-relativistic stage), and then slowly tends to
$-1$ (ultrarelativistic stage).

30
The categories of this paper are: q-alg
26
The categories of this paper are: bayes-an
31
The categories of this paper are: ao-sci
22
The categories of this paper are: chao-dyn
35
The categories of this paper are: mtrl-th
36
The categories of this paper are: cmp-lg
27
The categories of this paper are: comp-gas
13
The categories of this paper are: quant-ph
3
The categories of this paper are: physics
7
The categories of this paper are: hep-th
23
The categories of this paper are: solv-int
8
The categories of this paper are: hep-ex
11
The categories of this paper are: hep-lat
28
The categories of this paper are: alg-geom
19
The categories of this paper are: eess
10
The categories of this paper are: q-bio