RESOLUTION OF PUZZLES IN PERTURBATION CALCULATION IN QUANTUM FIELD THEORY AT FINITE TEMPERATURES |
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| Authors: | Hong-hua XU Chien-hua TSAI |
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| Institution: | 1. Putuo District College of Engineering, Shanghai, China;
2. Department of Physics and Institute of Condensed Matter Physics, Jiao-Tong University, Shanghai, China |
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| Abstract: | It is shown that the difficulties met in the perturbation calculation of quantum field processes at finite temperatures are all due to improperness in the formulationaqd to certain ad hoc manipulations in previous versions of the theory. They disappear in the CTPGF (Closed Time Path Green's Function) formulation initiated by Schwinger, implying that the latter formulation brings about a more satisfactory theory. |
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