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Vacuum polarisation effects in impulsive fields

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arxiv 2409.01372 v2 pith:YIRKI7TA submitted 2024-09-02 hep-ph hep-th

Anton Ilderton , Hannah Kingham This is my paper · ORCID
classification hep-phhep-th
keywords fieldsvacuumeffectshelicityimpulsivephotonsplanepolarisation
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Photons impinging on strong electromagnetic fields can change both momentum and helicity state, due to quantum vacuum polarisation. We investigate these effects in the collision of photons with impulsive PP-waves, which describe e.g. the fields of ultra-boosted charge distributions. We connect our results to vacuum birefringence and quantum reflection in both QED and SUSY QED. We also compare with helicity flip in plane wave backgrounds, exploring how and when known tree-level relations, relating amplitudes in PP-waves and in plane waves, extend to one-loop corrections.

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Cited by 1 Pith paper

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  1. Coherent enhancement of QED cross-sections in electromagnetic backgrounds

    hep-ph 2024-12 conditional novelty 5.0 of 10

    This paper shows that replacing a photon with a classical laser field can coherently boost QED cross-sections and improve their energy scaling, for example sigma_1->1 ~ (omega/m)^4 versus sigma_2->2 ~ (omega/m)^6.

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