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Backreaction on background fields: A coherent state approach

Research output: Contribution to Journal/MagazineJournal articlepeer-review

Article number016007
<mark>Journal publication date</mark>17/01/2018
<mark>Journal</mark>Physical Review D
Issue number1
Number of pages14
Publication StatusPublished
<mark>Original language</mark>English


There are many situations in which a strong electromagnetic field may be approximated as a fixed background. Going beyond this approximation, i.e. accounting for the back-reaction of quantum process on the field, is however challenging. Here we develop an approach to this problem which is a straightforward extension of background field methods. The approach follows from the observation that scattering in an on-shell background is equivalent to scattering between coherent states; we show that by deforming these states one can model back-reaction. Focussing on intense laser-matter interactions, we provide examples which model beam depletion and, furthermore, introduce an extremisation principle with which to determine the level of depletion in a given scattering process.