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We study the temperature dependence of the effective bag constant, the mass,and the radius of a nucleon in the formalism of the simple global colorsymmetry model in the Dyson-Schwinger equation approach of QCD with aGaussian-type effective gluon propagator. We obtain that, as the temperature islower than a critical value, the effective bag constant and the mass decreaseand the radius increases with the temperature increasing. As the criticaltemperature is reached, the effective bag constant and the mass vanish and theradius tends to infinity. At the same time, the chiral quark condensatedisappears. These phenomena indicate that the deconfinement and the chiralsymmetry restoration phase transitions can take place at high temperature. Thedependence of the critical temperature on the interaction strength parameter inthe effective gluon propagator of the approach is given.

Temperature Dependence of the Effective Bag Constant and the Radius of a Nucleon in the Global Color Symmetry Model of QCD