Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1993-11-09
Physics
High Energy Physics
High Energy Physics - Phenomenology
Talk presented at the 3rd Workshop on Thermal Field Theories and their Applications, Banff, Alberta (August, 1993), 7 pages, p
Scientific paper
The radiation produced by a classical charged current coupled to a quantized $A_{\mu}$ is first computed. To each order in $\alpha$, all infrared divergences cancel between the virtual $\gamma$'s and the real $\gamma$'s that are absorbed from or emitted into the plasma. When all orders of perturbation theory are summed, the finite answer predicts a suppression of radiation with $\omega< \alpha T$. The analysis of QED then consists of two steps. First, a general probability at $T\neq 0$ is organized so that all the virtual $e^{\pm},\gamma$ are in the amplitudes and all the real $e^{\pm},\gamma$ are in the phase space integrations. Next, the cancellations of IR divergences between virtual and real are demonstrated.
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