Classical Resummation and Breakdown of Strong-Field QED
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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Publisher
American Physical Society
Place of Publication
United States
Journal
Physical Review Letters
Volume
127
Issue
6
Pagination
061601-
Number
061601
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