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arXiv · 2101.12111

Classical resummation and breakdown of strong-field QED

T. Heinzl·A. Ilderton·B. King
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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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T. Heinzl, A. Ilderton, B. King. 2021-01-28. Classical resummation and breakdown of strong-field QED. https://doi.org/10.1103/physrevlett.127.061601

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