Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On curvature properties of Som-Raychaudhuri spacetime   Som-Raychaudhuri spacetime is a stationary cylindrical symmetric solution of
Einstein field equation corresponding to a charged dust distribution in rigid
rotation. The main object of the present paper is to investigate the curvature
restricted geometric structures admitting by the Som-Raychaudhuri spacetime and
it is shown that such a spacetime is a 2-quasi-Einstein, generalized Roter
type, $Ein(3)$ manifold satisfying $R.R = Q(S,R)$, $C\cdot C = \frac{2a^2}{3}
Q(g,C)$, and its Ricci tensor is cyclic parallel and Riemann compatible.
Finally, we make a comparison between G\"odel spacetime and Som-Raychaudhuri
spacetime.

19
The categories of this paper are: eess
27
The categories of this paper are: comp-gas
29
The categories of this paper are: funct-an
1
The categories of this paper are: cs
33
The categories of this paper are: plasm-ph
24
The categories of this paper are: dg-ga
15
The categories of this paper are: nucl-ex
11
The categories of this paper are: hep-lat
7
The categories of this paper are: hep-th
23
The categories of this paper are: solv-int
3
The categories of this paper are: physics
26
The categories of this paper are: bayes-an
17
The categories of this paper are: q-fin
28
The categories of this paper are: alg-geom
37
The categories of this paper are: supr-con
21
The categories of this paper are: adap-org