Thermal Bubble Diagrams Near Zero Energy

Details Thermal Bubble Diagrams Near Zero Energy Thermal Bubble Diagrams Near Zero Energy

1993-07-26

arxiv.org/abs/hep-ph/9307335v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

13 pages, LaTeX (3 PS figures appended), Imperial/TP/92-93/45

Scientific paper

The zero four-momentum and equal mass limits are taken for the bubble diagram of scalar fields. It is seen that RTF and ITF are in complete agreement. However contributions from this diagram to both retarded and time-ordered functions do depend on the order of the limits and can be infinite in some cases. This shows explicitly that the relation between the free energy and a derivative expansion of a thermal effective action is generally much more complicated that is the case at zero temperature.

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