with $M=B/A$. The presence of other colored objects in a color singlet configuration can supply the additional interaction necessary for the formation of a propagating mode, as is demonstrated in the nontopological soliton model of Ref.[@GSM]. There, for example, in the case of quarks coupled to a [*constant*]{} scalar mean field by the self-energy function $B$, the quark inverse Green’s function obtains the form $G^{-1}(P)=i\! \not \!
PA(P^2)+B(P^2)(1+\chi )$, where $0\geq \chi \geq -2$ characterizes the strength of the mean field. In this case a [*continuous*]{} single-particle energy spectrum, $E^2({\bf P}^2)={\bf P}^2+M_C^2$, is obtained because of the infinite-range potential, with the constituent mass given by $$M_C^2=\frac{\eta ^2}{4}\frac{(1+\chi )^2}{1-(1+\chi )^2}.\label{3.3}$$ From (\[3.3\]) it is evident that the increase of the constituent mass as the strength, $\chi $, of the mean field decreases toward its vacuum value ($\chi =0$), is due to the repulsive interaction with the vacuum. For the case of the constant mean field, the quarks are allowed to propagate throughout space. However, due to the energy stored in the mean field, the self-consistent (minimum-energy) solution acquires a finite range. In that case, as a quark in the system is separated from the others, the influence of the mean field 