Effective actions at finite temperature

Details Effective actions at finite temperature Effective actions at finite temperature

2009-11-24

arxiv.org/abs/0911.4605v2

Phys.Rev.D80:125039,2009

Physics

High Energy Physics

High Energy Physics - Theory

9 pages, revtex, 1 figure, references added

Scientific paper

10.1103/PhysRevD.80.125039

This is a more detailed version of our recent paper where we proposed, from first principles, a direct method for evaluating the exact fermion propagator in the presence of a general background field at finite temperature. This can, in turn, be used to determine the finite temperature effective action for the system. As applications, we discuss the complete one loop finite temperature effective actions for 0+1 dimensional QED as well as for the Schwinger model in detail. These effective actions, which are derived in the real time (closed time path) formalism, generate systematically all the Feynman amplitudes calculated in thermal perturbation theory and also show that the retarded (advanced) amplitudes vanish in these theories. Various other aspects of the problem are also discussed in detail.

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