Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1998-09-16
Physics
High Energy Physics
High Energy Physics - Phenomenology
Talk presented by J.K. at the Thermal-Field-Theory Workshop, TFT 98, Regensburg/Germany, Aug. 10-15, 1998; 10 pages, 2 ps-figu
Scientific paper
The effects of the propagation of particles which have a finite life time and an according width in their mass spectrum are discussed in the context of transport descriptions. In the first part the coupling of soft photon modes to a source of charged particles is studied in a classical model which can be solved completely in analytical terms. The solution corresponds to a re-summation of certain field theory diagrams. The second part addresses the derivation of transport equations which also account for the damping width of the particles. The $\Phi$-derivable method of Baym is used to derive a self-consistent and conserving scheme. For this scheme a conserved energy-momentum tensor can be constructed. Furthermore, a kinetic entropy can be derived which besides the standard quasi-particle part also includes contributions from fluctuation.
Ivanov Yu. B.
Knoll Joern
Voskresenski D. N.
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