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• W2104679747 abstract "AbstractIn this work quantum electrodynamics at T > 0 is considered. For this purpose weuse thermo field dynamics and the causal approach to quantum field theory accordingto Epstein and Glaser, the latter being a rigorous method to avoid the well-knownultraviolet divergencies of quantum field theory. It will be shown that the theory isinfrared divergent if the usual scattering states are used. The same is true if we use moregeneral mixed states. This is in contradiction to the results established in the literature,and we will point out why these earlier approaches fail to describe the infrared behaviourcorrectly. We also calculate the thermal corrections to the electron magnetic momentin the low temperature approximation k B T ≪ m e − . This is done by investigating thescattering of an electron on a C-number potential in third order in the limit of smallmomentum transfer p → q. We reproduce one of the different results reported up tonow in literature. In the low temperature approximation infrared finiteness is recoveredin a very straightforward way: In contrast to the literature we do not have to introducea thermal Dirac equation or thermal spinors.PACS number: 11.10.Wx, 14.60.Cd, 12.20.DsKeywords: Thermal Field Theory, Infrared DivergenciesPreprint: ZU-TH 37/1999" @default.
• W2104679747 created "2016-06-24" @default.
• W2104679747 creator A5071522592 @default.
• W2104679747 date "2000-01-01" @default.
• W2104679747 modified "2023-09-27" @default.
• W2104679747 title "Finite Temperature QED: Non-Cancellation of Infrared Divergencies and Thermal Corrections to the Electron Magnetic Moment" @default.
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