Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A cylindrically symmetric, static anisotropic fluid spacetime and the
  naked singularity   In this article, a cylindrical symmetry and static solution of the Einstein's
field equations, was presented. The space-time is conformally flat, regular
everywhere except on the symmetry axis where it possesses a naked curvature
singularity. The matter-energy source anisotropic fluids violates the weak
energy condition (WEC), diverge on the symmetry axis. We discuss geodesics
motion of free test-particles near to the singularity, and geodesic expansion
in the metric to understand the nature of singularity which is naked or
covered, and finally the C-energy of the space-time.

24
The categories of this paper are: dg-ga
16
The categories of this paper are: stat
17
The categories of this paper are: q-fin
10
The categories of this paper are: q-bio
7
The categories of this paper are: hep-th
13
The categories of this paper are: quant-ph
8
The categories of this paper are: hep-ex
33
The categories of this paper are: plasm-ph
11
The categories of this paper are: hep-lat
14
The categories of this paper are: math-ph
15
The categories of this paper are: nucl-ex
29
The categories of this paper are: funct-an
31
The categories of this paper are: ao-sci
36
The categories of this paper are: cmp-lg
37
The categories of this paper are: supr-con
20
The categories of this paper are: acc-phys