  We follow Quark-gluon transport theory and analyse singularities of the
ultra-relativistic and spherical expanding quark-gluon plasma. Within the
linearized QCD oscillations and instabilities of the ultra-relativistic and
spherical symmetric expanding quark-gluon plasma near global thermodynamical
equilibrium are investigated in dependence on a chemical potential mu(T) of
non-strange light quarks and antiquarks, a strange quark mass m_s, a
temperature T and a hydrodynamical velocity $u$. We calculate the
chromoelectric permeability tensor for the quark-gluon plasma at rest and
ultra-relativistic moving. We show that the contribution of chemical potential
of light quarks and antiquarks can be neglected to the chromoelectric
permeability. We show that the account for the non-zero mass of strange quarks
and antiquarks diminishes the value of the plasma frequency. We show that the
plasma frequency of the ultra-relativistic and spherical symmetric expanding
quark-gluon plasma is enhanced by a Lorentz factor compared with the plasma
frequency of the quark-gluon plasma at rest. We find that the
ultra-relativistic and spherical symmetric expanding quark-gluon plasma behaves
like a collisionless thermalized plasma.
