Abstract
We try to generalize the notion of wave-function renormalization at finite temperature. In some limiting, but physically important cases, it is indeed possible to define a (momentum-dependent) wave-function renormalization “constant”, to be associated with external lines in physical process. We examine the limitations of this approach in other cases.
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Unité de Recherche Associée au CNRS, URA 767
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Le Bellac, M., Poizat, D. Renormalization of external lines in relativistic field theories at finite temperature. Z. Phys. C - Particles and Fields 47, 125–131 (1990). https://doi.org/10.1007/BF01551922
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DOI: https://doi.org/10.1007/BF01551922