On nonstationary inhomogeneities of the nonlinear 3D Klein — Gordon equation

A system of a point material particle and a field described by the nonlinear 3D Klein – Gordon equation is considered. The particle creates nonuniformity of the field and interacts with it. It is showed that when taking into account relativistic effects, if the particle small in comparison with the parameters of nonuniformity of the rest mass, a stable minimum of energy at zero velocity is impossible. Such a behavior is of interest from the point of view of soliton models construction of particles with an intrinsic non-zero moment or soliton models of particles with the oscillating mass.