Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2007-05-01
Phys.Rev.D76:045019,2007
Physics
High Energy Physics
High Energy Physics - Phenomenology
24 pages, 21 figures
Scientific paper
10.1103/PhysRevD.76.045019
In this article we calculate the electrical conductivity in QED using the 2PI effective action. We use a modified version of the usual 2PI effective action which is defined with respect to self-consistent solutions of the 2-point functions. We show that the green functions obtained from this modified effective action satisfy ward identities and that the conductivity obtained from the kubo relation is gauge invariant. We work to 3-loop order in the modified 2PI effective action and show explicitly that the resulting expression for the conductivity contains the square of the amplitude that corresponds to all binary collision and production processes.
Carrington Magaret E.
Kovalchuk Evgeny
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