Tuesday, April 30, 2013

1304.7672 (S. Meuren et al.)

Polarization operator for plane-wave background fields    [PDF]

S. Meuren, C. H. Keitel, A. Di Piazza
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.
View original: http://arxiv.org/abs/1304.7672

No comments:

Post a Comment