Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1999-11-25
Phys.Rev.D61:085013,2000; Erratum-ibid.D67:049902,2003
Physics
High Energy Physics
High Energy Physics - Phenomenology
16 pages in Revtex with 3 figures, dense version, a typo corrected
Scientific paper
10.1103/PhysRevD.61.085013
We derive spectral representations for the different components of the 4-point function at finite temperature in the real time formalism in terms of five real spectral densities. We explicitly calculate all these functions in QED in the hard thermal loop approximation. The Ward identities obeyed by the 1-loop 3- and 4-point functions in real time and their spectral functions are derived. We compare our results with those derived previously in the imaginary-time formalism for retarded functions in hot QCD, and we discuss the generalization of our results to non-equilibrium situations.
Carrington Magaret E.
Defu Hou
Heinz Ulrich
Kobes Randy
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