Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Perturbations of rotating cosmological black holes   Charged, rotating black hole solutions of Einstein's gravitational equations
are investigated in the presence of a cosmological constant. A pair of wave
equations governing the electromagnetic and gravitational perturbations are
derived.

36
The categories of this paper are: cmp-lg
13
The categories of this paper are: quant-ph
19
The categories of this paper are: eess
9
The categories of this paper are: nlin
7
The categories of this paper are: hep-th
27
The categories of this paper are: comp-gas
16
The categories of this paper are: stat
35
The categories of this paper are: mtrl-th
3
The categories of this paper are: physics
8
The categories of this paper are: hep-ex
33
The categories of this paper are: plasm-ph
28
The categories of this paper are: alg-geom
21
The categories of this paper are: adap-org
10
The categories of this paper are: q-bio
6
The categories of this paper are: astro-ph
24
The categories of this paper are: dg-ga