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이상진 연세대학교 대학원원우회 1987 원우론집 Vol.14 No.2
Field theory at finite temperature is reviewed and by using the real time formalism the one loop diagrams of real scalar field theory and scalar QED is computed. Renormalization at finite temperature is carried out and the mass of the particle is shown to increase with temperature. In the case of real scalar theory the coupling constant decrease with temperature, and in scalar QED the coupling constant is not affected by vertex correction and increases with temperature because of photon polarization effect. Renormalization group theory is expanded to the finite temperature system. Renormalization group equation is derived and the various asymptotic behaviors are studied.