ORCID

Abstract

We consider the absorption of probe photons by electrons in the presence of an intense, pulsed, background field. Our analysis reveals an interplay between regularisation and gauge invariance which distinguishes absorption from its crossing-symmetric processes, as well as a physical interpretation of absorption in terms of degenerate processes in the weak field limit. In the strong field limit we develop a locally constant field approximation (LCFA) for absorption which also exhibits new features. We benchmark the LCFA against exact analytical calculations and explore its regime of validity. Pulse shape effects are also investigated, as well as infra-red and collinear limits of the absorption process.

DOI

10.1103/PhysRevD.100.076002

Publication Date

2019-09-17

Publication Title

Physical Review D: Particles, Fields, Gravitation and Cosmology

ISSN

1550-2368

Embargo Period

2019-12-18

Organisational Unit

School of Engineering, Computing and Mathematics

Keywords

hep-ph, physics.plasm-ph

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