Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: An optimal system and invariant solutions of dark energy Models in
  cylindrically symmetric space-time   In this paper, we derive some new invariant solutions of dark energy models
in cylindrically symmetric space-time. To quantify the deviation of pressure
from isotropy, we introduce three different time dependent skewness parameters
along the spatial directions. The matter source consists of dark energy which
is minimally interact with perfect fluid. We use symmetry analysis method for
solving the non-linear partial differential equations (NLPDEs) which is more
powerful than the classical methods of solving NLPDEs. The geometrical and
kinematical features of the models and the behaviour of the anisotropy of dark
energy, are examined in detail.

14
The categories of this paper are: math-ph
36
The categories of this paper are: cmp-lg
3
The categories of this paper are: physics
27
The categories of this paper are: comp-gas
0
The categories of this paper are: hep-ph
8
The categories of this paper are: hep-ex
11
The categories of this paper are: hep-lat
2
The categories of this paper are: math
26
The categories of this paper are: bayes-an
21
The categories of this paper are: adap-org
17
The categories of this paper are: q-fin
9
The categories of this paper are: nlin
1
The categories of this paper are: cs
33
The categories of this paper are: plasm-ph
15
The categories of this paper are: nucl-ex
31
The categories of this paper are: ao-sci