Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Higher order intertwining approach to quasinormal modes   Using higher order intertwining operators we obtain new exactly solvable
potentials admitting quasinormal mode (QNMs) solutions of the Klein-Gordon
equation. It is also shown that different potentials exhibiting QNMs can be
related through nonlinear supersymmetry.

12
The categories of this paper are: nucl-th
35
The categories of this paper are: mtrl-th
8
The categories of this paper are: hep-ex
33
The categories of this paper are: plasm-ph
0
The categories of this paper are: hep-ph
10
The categories of this paper are: q-bio
2
The categories of this paper are: math
14
The categories of this paper are: math-ph
9
The categories of this paper are: nlin
21
The categories of this paper are: adap-org
25
The categories of this paper are: patt-sol
31
The categories of this paper are: ao-sci
6
The categories of this paper are: astro-ph
3
The categories of this paper are: physics
13
The categories of this paper are: quant-ph
15
The categories of this paper are: nucl-ex