HEP/Astro Seminar, Wednesday 8th April 1998

One-Loop Low Energy Effective Action in QED (worldline method)

Igor Shovkovy (U. Cincinnati)

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Abstract

The derivative expansion of the one-loop effective Lagrangian in
QED_3 and QED_4 is considered. The first term in such an expansion 
is the Schwinger's result for a constant electromagnetic field. An
explicit expression for the next term containing two derivatives of 
the field strength with respect to space-time coordinates is obtained.
The general results for both fermion and scalar electrodynamics are
presented. The cases of pure electric and pure magnetic external 
fields are considered in details. The Feynman rules for the 
perturbative expansion of the one-loop effective action in the
number of derivatives are presented.

Wednesday, 3:30pm, Smith Lab 4079