Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Isotropization in Bianchi type-I cosmological model with fermions and
  bosons interacting via Yukawa potential   In this work we investigate a model for the early Universe in a Bianchi
type-I metric, where the sources of the gravitational field are a fermionic and
a bosonic field, interacting through a Yukawa potential, following the standard
model of elementary particles. It is shown that the fermionic field has a
negative pressure, while the boson has a small positive pressure. The fermionic
field is the responsible for an accelerated regime at early times, but since
the total pressure tends to zero for large times, a transition to a decelerated
regime occurs. Here the Yukawa potential answers for the duration of the
accelerated regime, since by decreasing the value of its coupling constant the
transition accelerated-decelerated occurs in later times. The isotropization
which occurs for late times is due to the presence of the fermionic field as
one of the sources of the gravitational field.

2
The categories of this paper are: math
3
The categories of this paper are: physics
6
The categories of this paper are: astro-ph
20
The categories of this paper are: acc-phys
36
The categories of this paper are: cmp-lg
11
The categories of this paper are: hep-lat
10
The categories of this paper are: q-bio
19
The categories of this paper are: eess
26
The categories of this paper are: bayes-an
12
The categories of this paper are: nucl-th
31
The categories of this paper are: ao-sci
1
The categories of this paper are: cs
25
The categories of this paper are: patt-sol
16
The categories of this paper are: stat
35
The categories of this paper are: mtrl-th
9
The categories of this paper are: nlin