Mode truncations and scattering in strong fields

Abstract

Truncating quantum field theories to a dominant mode offers a non-perturbative approach to their solution. We consider here the interaction of charged scalar matter with a single mode of the electromagnetic field. The implied breaking of explicit Lorentz invariance prompts us to compare instant-form quantisation and front-form, with the latter yielding significant simplifications when light-front zero modes are included. Using these field theory results we reassess the validity of existing first-quantised approaches to depletion effects in strong laser fields, and propose an alternative interpretation based on the dressing approach to QED and its infra-red structure.

arXiv comment18 pages, 1 pdf figure. Version 2: abbreviated presentation, results unchanged. Matches version to appear in Phys.Rev.D

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Cited by in corpus (8)

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• Charged particle motion and radiation in strong electromagnetic fields
• Relativistic Plasma Physics in Supercritical Fields
• Back-reaction in strong field QED: a toy model
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