Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Solution of the Scalar Coulomb Bethe-Salpeter Equation   A relativistic two-body wave equation, local in configuration space, is
derived from the Bethe-Salpeter equation for two scalar particles bound by a
scalar Coulomb interaction. The two-body bound-state wave equation is solved
analytically, giving a two-body Bohr-Sommerfeld formula whose energies agree
with the Bethe-Salpeter equation to order alpha^4 for all quantum states. From
the Bohr-Sommerfeld formula, along with the expectation values of two remaining
small corrections, the energy levels of the scalar Coulomb Bethe-Salpeter
equation are worked out to order alpha^6 for all states.

13
The categories of this paper are: quant-ph
5
The categories of this paper are: gr-qc
9
The categories of this paper are: nlin
14
The categories of this paper are: math-ph
1
The categories of this paper are: cs
25
The categories of this paper are: patt-sol
22
The categories of this paper are: chao-dyn
10
The categories of this paper are: q-bio
20
The categories of this paper are: acc-phys
16
The categories of this paper are: stat
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The categories of this paper are: nucl-ex
0
The categories of this paper are: hep-ph
2
The categories of this paper are: math
12
The categories of this paper are: nucl-th
36
The categories of this paper are: cmp-lg
18
The categories of this paper are: econ