Scattering amplitudes and electromagnetic horizons

Anton Ilderton*, William Lindved

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

We consider the scattering of charged particles on particular electromagnetic
fields which have properties analogous to gravitational horizons. Classically, particles become causally excluded from regions of spacetime beyond a null surface which we identify as the ‘electromagnetic horizon’. In the quantum theory there is pair production at the horizon via the Schwinger effect, but only one particle from the pair escapes the field. Furthermore, unitarity appears to be violated when crossing the horizon, suggesting there is no well-defined S-matrix. Despite this, we show how to use the perturbiner method to construct ‘amplitudes’ which contain all the dynamical information required to construct observables related to pair creation, and to radiation from particles scattering on the background.
Original languageEnglish
Article number118
Pages (from-to)1-28
Number of pages28
JournalJournal of High Energy Physics
Issue number12
Publication statusPublished - 18 Dec 2023

Keywords / Materials (for Non-textual outputs)

  • Nonperturbative Effects
  • Scattering Amplitudes


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