Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: New classes of exact interior nonvacuum solutions to the GR field
  equations for spacetimes sourced by a rigidly rotating stationary cylindrical
  anisotropic fluid   A double new class of solutions to the general relativity field equations
describing interior spacetimes sourced by stationary cylindrical anisotropic
fluids with principal stress directed along the symmetry axis is displayed.
These solutions are required to satisfy regularity and junction conditions so
that they can be possibly used to represent rotating astrophysical objects.
Mathematical and physical properties are analyzed. The spacetime two
independent parameters are physically interpreted, and they are shown to define
two different solution classes together with stating the latters' properties.

22
The categories of this paper are: chao-dyn
13
The categories of this paper are: quant-ph
1
The categories of this paper are: cs
32
The categories of this paper are: atom-ph
26
The categories of this paper are: bayes-an
34
The categories of this paper are: chem-ph
10
The categories of this paper are: q-bio
20
The categories of this paper are: acc-phys
16
The categories of this paper are: stat
4
The categories of this paper are: cond-mat
0
The categories of this paper are: hep-ph
18
The categories of this paper are: econ
19
The categories of this paper are: eess
27
The categories of this paper are: comp-gas
33
The categories of this paper are: plasm-ph
30
The categories of this paper are: q-alg