Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Asymptotically vanishing PT-symmetric potentials and negative-mass
  Schroedinger equations   In paper I [M. Znojil and G. L\'evai, Phys. Lett. A 271 (2000) 327] we
introduced the Coulomb - Kratzer bound-state problem in its cryptohermitian,
PT-symmetric version. An instability of the original model is revealed and its
necessary stabilization is achieved, for almost all couplings, by an unusual,
negative choice of the bare mass in Schroediner equation.

8
The categories of this paper are: hep-ex
0
The categories of this paper are: hep-ph
31
The categories of this paper are: ao-sci
3
The categories of this paper are: physics
12
The categories of this paper are: nucl-th
22
The categories of this paper are: chao-dyn
10
The categories of this paper are: q-bio
28
The categories of this paper are: alg-geom
14
The categories of this paper are: math-ph
36
The categories of this paper are: cmp-lg
21
The categories of this paper are: adap-org
17
The categories of this paper are: q-fin
5
The categories of this paper are: gr-qc
20
The categories of this paper are: acc-phys
32
The categories of this paper are: atom-ph
15
The categories of this paper are: nucl-ex