Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Symmetry Group Analysis for perfect fluid Inhomogeneous Cosmological
  Models in General Relativity   In this paper, we have searched the existence of the similarity solution for
plane symmetric inhomogeneous cosmological models in general relativity. The
matter source consists of perfect fluid with proportionality relation between
expansion scalar and shear scalar. The isovector fields of Einstein's field
equation for the models under consideration are derived. A new class of exact
solutions of Einstein's field equation have been obtained for inhomogeneous
space-time. The physical behaviors and geometric aspects of the derived models
have been discussed in detail.

22
The categories of this paper are: chao-dyn
29
The categories of this paper are: funct-an
3
The categories of this paper are: physics
26
The categories of this paper are: bayes-an
19
The categories of this paper are: eess
27
The categories of this paper are: comp-gas
9
The categories of this paper are: nlin
32
The categories of this paper are: atom-ph
16
The categories of this paper are: stat
1
The categories of this paper are: cs
15
The categories of this paper are: nucl-ex
4
The categories of this paper are: cond-mat
8
The categories of this paper are: hep-ex
25
The categories of this paper are: patt-sol
2
The categories of this paper are: math
28
The categories of this paper are: alg-geom