The one-loop correction to the laser-induced mass shift in QED is gauge dependent, vanishing in Landau gauge where only vacuum renormalisation is needed.
Strong-Field QED and High Power Lasers
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abstract
This contribution presents an overview of fundamental QED processes in the presence of an external field produced by an ultra-intense laser. The discussion focusses on the basic intensity effects on vacuum polarisation and the prospects for their observation. Some historical remarks are added where appropriate.
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One loop Volkov propagator in the Lorentz class of gauges
The one-loop correction to the laser-induced mass shift in QED is gauge dependent, vanishing in Landau gauge where only vacuum renormalisation is needed.