Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Interior Kerr solutions with the Newman-Janis algorithm starting with
  static physically reasonable space-times   We present a simple approach for obtaining Kerr interior solutions with the
help of the Newman-Janis algorithm (NJA) starting with static space-times
describing physically sensible interior Schwarzschild solutions. In this
context, the Darmois-Israel (DI) junction conditions are analyzed. Starting
from the incompressible Schwarzschild solution, a class of Kerr interior
solutions is presented, together with a discussion of the slowly rotating
limit. The energy conditions are discussed for the solutions so obtained.
Finally, the NJA algorithm is applied to the static, anisotropic, conformally
flat solutions found by Stewart leading to interior Kerr solutions with oblate
spheroidal boundary surfaces.

18
The categories of this paper are: econ
4
The categories of this paper are: cond-mat
25
The categories of this paper are: patt-sol
27
The categories of this paper are: comp-gas
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The categories of this paper are: q-fin
12
The categories of this paper are: nucl-th
2
The categories of this paper are: math
16
The categories of this paper are: stat
21
The categories of this paper are: adap-org
11
The categories of this paper are: hep-lat
22
The categories of this paper are: chao-dyn
3
The categories of this paper are: physics
32
The categories of this paper are: atom-ph
0
The categories of this paper are: hep-ph
14
The categories of this paper are: math-ph
36
The categories of this paper are: cmp-lg