Vertex Decoupling and Quark Deconfinement in Soliton Bag Model at Finite Temperature

By means of the Matsubara Green’s function method, we investigate the tem-perature dependence of coupling constant gqqo in soliton bag model. We find g_qqσ will decrease as temperature increases in high temperature region and will approach zero at critical temperature T_c. The quark deconfinement phase transition in soliton bag model is discussed.