Three-point spectral density in QED and the ward identity
at finite temperature
D. Hou1,2 - U. Heinz1
1 Institut für Theoretische Physik, Universität Regensburg,
D-93040 Regensburg, Germany
2 Institute of Particle Physics, Hua-Zhong Normal University, 430079 Wuhan, P.R. China
Received: 12 March 1998 / Published online: 21 September 1998
We derive the spectral representations of QED 3-point functions and then explicitly calculate the 3-point spectral densities in hard thermal loop approximation within the real time formalism. The Ward identities obeyed by the retarded and advanced 2- and 3-point functions are discussed. We compare our results with those for hot QCD.