Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the Soliton Model of a Point Particle Spin   A system consisting of a point material particle and a scalar field described
by the nonlinear Klein-Gordon equation has been considered. It has been shown
that, when taking into account relativistic effects, in the case of small rest
masses of a particle an energy minimum at zero velocity is impossible for such
a particle. It has been proved that under certain parameters the spin state of
a particle has a lower energy than its steady state does. Such a behavior is
interesting for the construction of soliton models of spin. By a point particle
spin an intrinsic angular momentum (orbital, in strict sense, but with a short
orbital radius) of a point particle is meant.

23
The categories of this paper are: solv-int
11
The categories of this paper are: hep-lat
1
The categories of this paper are: cs
2
The categories of this paper are: math
26
The categories of this paper are: bayes-an
10
The categories of this paper are: q-bio
20
The categories of this paper are: acc-phys
35
The categories of this paper are: mtrl-th
5
The categories of this paper are: gr-qc
18
The categories of this paper are: econ
21
The categories of this paper are: adap-org
8
The categories of this paper are: hep-ex
29
The categories of this paper are: funct-an
13
The categories of this paper are: quant-ph
14
The categories of this paper are: math-ph
22
The categories of this paper are: chao-dyn