Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Anisotropic cosmological dynamics in $f(T)$ gravity in the presence of a
  perfect fluid   We consider the cosmological evolution of a flat anisotropic Universe in
$f(T)$ gravity in the presence of a perfect fluid. It is shown that the matter
content of the Universe has a significant impact of the nature of a
cosmological singularity in the model studied. Depending on the parameters of
the $f(T)$ function and the equation of state of the perfect fluid in question
the well-known Kasner regime of general relativity can be replaced by a new
anisotropic solution, or by an isotropic regime, or the cosmological
singularity changes its nature to a non-standard one with a finite values of
Hubble parameters. Six possible scenarios of the cosmological evolution for the
model studied have been found numerically.

19
The categories of this paper are: eess
7
The categories of this paper are: hep-th
37
The categories of this paper are: supr-con
4
The categories of this paper are: cond-mat
30
The categories of this paper are: q-alg
23
The categories of this paper are: solv-int
6
The categories of this paper are: astro-ph
31
The categories of this paper are: ao-sci
32
The categories of this paper are: atom-ph
1
The categories of this paper are: cs
15
The categories of this paper are: nucl-ex
29
The categories of this paper are: funct-an
16
The categories of this paper are: stat
3
The categories of this paper are: physics
9
The categories of this paper are: nlin
28
The categories of this paper are: alg-geom