Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Perturbed Coulomb potentials in the Klein-Gordon equation via the
  shifted-1 expansion technique   A shifted - l expansion technique is introduced to calculate the energy
eigenvalues for Klein-Gordon (KG) equation with Lorentz vector and/or Lorentz
scalar potentials. Although it applies to any spherically symmetric potential,
those that include Coulomb-like terms are only considered. Exact eigenvalues
for a Lorentz vector or a Lorentz scalar, and an equally mixed Lorentz vector
and Lorenz scalar Coulombic potentials are reproduced. Highly accurate and
rapidly converging ground-state energies for Lorentz vector Coulomb with a
Lorentz scalar linear potential, V(r)=-A1/r+kr, and S(r)=kr, respectively, are
obtained. Moreover, a simple straightforward closed-form solution for a
KG-particle in a Coulombic Lorentz vector and Lorentz scalar potentials is
presented in appendix A.

18
The categories of this paper are: econ
25
The categories of this paper are: patt-sol
4
The categories of this paper are: cond-mat
7
The categories of this paper are: hep-th
21
The categories of this paper are: adap-org
11
The categories of this paper are: hep-lat
9
The categories of this paper are: nlin
13
The categories of this paper are: quant-ph
32
The categories of this paper are: atom-ph
15
The categories of this paper are: nucl-ex
31
The categories of this paper are: ao-sci
22
The categories of this paper are: chao-dyn
0
The categories of this paper are: hep-ph
28
The categories of this paper are: alg-geom
20
The categories of this paper are: acc-phys
26
The categories of this paper are: bayes-an