Classical Resummation and Breakdown of Strong-Field QED.
Phys Rev Lett
; 127(6): 061601, 2021 Aug 06.
Article
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| MEDLINE
| ID: mdl-34420332
ABSTRACT
QED perturbation theory has been conjectured to break down in sufficiently strong backgrounds, obstructing the analysis of strong-field physics. We show that the breakdown occurs even in classical electrodynamics, at lower field strengths than previously considered, and that it may be cured by resummation. As a consequence, an analogous resummation is required in QED. A detailed investigation shows, for a range of observables, that unitarity removes diagrams previously believed to be responsible for the breakdown of QED perturbation theory.
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