Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2000-02-28
Physics
High Energy Physics
High Energy Physics - Phenomenology
9 pages, 1 eps figure, to appear in "Progress in Nonequilibrium Green's functions.", M. Bonitz (Ed.), World Scientific, Singap
Scientific paper
We generalize the concept of conserving,\Phi-derivable, approximations to relativistic field theories. Treating the interaction field as a dynamical degree of freedom, we derive the thermodynamical potential in terms of fully dressed propagators, an approach which allows us to resolve the entropy of a relativistic plasma into contributions from its interacting elementary excitations. We illustrate the derivation for a hot QED plasma of massless particles. We also discuss how the self-consistency of the treatment manifests itself into relationships between the contributions from interaction and matter fields.
Baym Gordon
Vanderheyden Benoit
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