  We study the effects of light scalar mesons on the skyrmion properties by
constructing and examining a mesonic model including pion, rho meson, and omega
meson fields as well as two-quark and four-quark scalar meson fields. In our
model, the physical scalar mesons are defined as mixing states of the two- and
four-quark fields. We first omit the four-quark scalar meson field from the
model and find that when there is no direct coupling between the two-quark
scalar meson and the vector mesons, the soliton mass is smaller and the soliton
size is larger for lighter scalar mesons; when direct coupling is switched on,
as the coupling strength increases, the soliton becomes heavy, and the radius
of the baryon number density becomes large, as the repulsive force arising from
the $\omega$ meson becomes strong. We then include the four-quark scalar meson
field in the model and find that mixing between the two-quark and four-quark
components of the scalar meson fields also affects the properties of the
soliton. When the two-quark component of the lighter scalar meson is increased,
the soliton mass decreases and the soliton size increases.
