Classical resummation and breakdown of strong-field QED
arXiv:2101.12111 · doi:10.1103/PhysRevLett.127.061601
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.
arXiv comment8 pages, 2 figures; v2: Journal version with Supplementaries added
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