Ward identity and electrical conductivity in hot QED

Details Ward identity and electrical conductivity in hot QED Ward identity and electrical conductivity in hot QED

2002-09-04

arxiv.org/abs/hep-ph/0209048v2

JHEP 0211 (2002) 022

Physics

High Energy Physics

High Energy Physics - Phenomenology

25 pages with 5 eps figures, discussion in section 3 improved; to appear in JHEP

Scientific paper

10.1088/1126-6708/2002/11/022

We study the Ward identity for the effective photon-electron vertex summing the ladder diagrams contributing to the electrical conductivity in hot QED at leading logarithmic order. It is shown that the Ward identity requires the inclusion of a new diagram in the integral equation for the vertex that has not been considered before. The real part of this diagram is subleading and therefore the final expressions for the electrical conductivity at leading logarithmic order are not affected.

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