Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: 2+1 dimensional solution of Einstein Cartan equations   In this work a static solution of Einstein-Cartan (EC) equations in 2+1
dimensional space-time is given by considering classical spin-1/2 field as
external source for torsion of the space-time. Here, the torsion tensor is
obtained from metricity condition for the connection and the static spinor
field is determined as the solution of Dirac equation in 2+1 spacetime with
non-zero cosmological constant and torsion. The torsion itself is considered as
a non-dynamical field.

28
The categories of this paper are: alg-geom
35
The categories of this paper are: mtrl-th
6
The categories of this paper are: astro-ph
16
The categories of this paper are: stat
23
The categories of this paper are: solv-int
34
The categories of this paper are: chem-ph
15
The categories of this paper are: nucl-ex
33
The categories of this paper are: plasm-ph
0
The categories of this paper are: hep-ph
3
The categories of this paper are: physics
30
The categories of this paper are: q-alg
29
The categories of this paper are: funct-an
11
The categories of this paper are: hep-lat
25
The categories of this paper are: patt-sol
2
The categories of this paper are: math
12
The categories of this paper are: nucl-th