Absorption cross section in an intense plane wave background

@article{Ilderton2019AbsorptionCS,
  title={Absorption cross section in an intense plane wave background},
  author={Anton Ilderton and B. King and A. J. MacLeod},
  journal={Physical Review D},
  year={2019}
}
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… 

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