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Polarization operator for plane-wave background fields

MPG-Autoren
http://pubman.mpdl.mpg.de/cone/persons/resource/persons30807

Meuren,  Sebastian
Division Prof. Dr. Christoph H. Keitel, MPI for Nuclear Physics, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons30659

Keitel,  Christoph H.
Division Prof. Dr. Christoph H. Keitel, MPI for Nuclear Physics, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons30413

Di Piazza,  Antonino
Division Prof. Dr. Christoph H. Keitel, MPI for Nuclear Physics, Max Planck Society;

Externe Ressourcen
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1304.7672.pdf
(Preprint), 357KB

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Zitation

Meuren, S., Keitel, C. H., & Di Piazza, A. (2013). Polarization operator for plane-wave background fields. Physical Review D, 88(1): 013007, pp. 1-19. doi:10.1103/PhysRevD.88.013007.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-0014-4FFF-C
Zusammenfassung
We derive an alternative representation of the leading-order contribution to the polarization operator in strong-field QED with a plane-wave electromagnetic background field, which is manifestly symmetric with respect to the external photon momenta. Our derivation is based on a direct evaluation of the corresponding Feynman diagram, using the Volkov-representation of the dressed fermion propagator. Furthermore, the validity of the Ward-Takahashi identity is shown for general loop diagrams in an external plane-wave background field.